| [26] | 1 | |
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| 2 | #-------------------------------------------------------------------- |
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| 3 | # Author: Gerson Balbueno Bicca |
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| 4 | # $Id: HeatExchangerDetailed.mso 68 2006-11-27 20:37:59Z bicca $ |
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| 5 | #-------------------------------------------------------------------- |
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| [1] | 6 | |
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| 7 | using "HEX_Engine"; |
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| 8 | |
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| [26] | 9 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
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| [45] | 10 | # Basic Model for Detailed Shell and Tubes Heat Exchangers |
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| [26] | 11 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
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| [1] | 12 | |
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| 13 | Model HeatExchangerDetailed_Basic |
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| [26] | 14 | |
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| [1] | 15 | PARAMETERS |
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| 16 | |
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| [26] | 17 | ext PP as CalcObject (Brief="External Physical Properties"); |
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| 18 | ext NComp as Integer (Brief="Number of Components"); |
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| [45] | 19 | HE as CalcObject (Brief="STHE Calculations",File="heatex"); |
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| 20 | M(NComp) as molweight (Brief="Component Mol Weight"); |
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| [1] | 21 | |
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| 22 | VARIABLES |
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| [45] | 23 | |
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| [26] | 24 | in Inlet as Inlet_Main_Stream; |
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| 25 | out Outlet as Outlet_Main_Stream; |
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| 26 | Properties as Main_Properties; |
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| 27 | Details as Details_Main; |
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| 28 | Tubes as Tube_Side_Main; |
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| 29 | Shell as Shell_Side_Main; |
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| 30 | Resistances as Main_Resistances; |
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| 31 | Baffles as Baffles_Main; |
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| [1] | 32 | |
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| 33 | SET |
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| [26] | 34 | M = PP.MolecularWeight(); |
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| [1] | 35 | |
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| 36 | EQUATIONS |
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| 37 | |
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| [26] | 38 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
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| 39 | # Properties # |
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| 40 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
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| 41 | |
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| [45] | 42 | "Hot Stream Average Temperature" |
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| [1] | 43 | Properties.Hot.Average.T = 0.5*Inlet.Hot.T + 0.5*Outlet.Hot.T; |
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| 44 | |
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| 45 | "Cold Stream Average Temperature" |
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| 46 | Properties.Cold.Average.T = 0.5*Inlet.Cold.T + 0.5*Outlet.Cold.T; |
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| 47 | |
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| [45] | 48 | "Hot Stream Average Pressure" |
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| [1] | 49 | Properties.Hot.Average.P = 0.5*Inlet.Hot.P+0.5*Outlet.Hot.P; |
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| 50 | |
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| 51 | "Cold Stream Average Pressure" |
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| 52 | Properties.Cold.Average.P = 0.5*Inlet.Cold.P+0.5*Outlet.Cold.P; |
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| 53 | |
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| 54 | "Hot Stream Average Molecular Weight" |
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| 55 | Properties.Hot.Average.Mw = sum(M*Inlet.Hot.z); |
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| 56 | |
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| 57 | "Cold Stream Average Molecular Weight" |
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| 58 | Properties.Cold.Average.Mw = sum(M*Inlet.Cold.z); |
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| 59 | |
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| 60 | |
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| 61 | if Inlet.Cold.v equal 0 |
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| 62 | |
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| 63 | then |
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| 64 | |
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| [45] | 65 | "Cold Stream Average Heat Capacity" |
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| [1] | 66 | Properties.Cold.Average.Cp = PP.LiquidCp(Properties.Cold.Average.T,Properties.Cold.Average.P,Inlet.Cold.z); |
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| [45] | 67 | |
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| 68 | "Cold Stream Inlet Heat Capacity" |
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| [1] | 69 | Properties.Cold.Inlet.Cp = PP.LiquidCp(Inlet.Cold.T,Inlet.Cold.P,Inlet.Cold.z); |
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| [45] | 70 | |
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| 71 | "Cold Stream Outlet Heat Capacity" |
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| [1] | 72 | Properties.Cold.Outlet.Cp = PP.LiquidCp(Outlet.Cold.T,Outlet.Cold.P,Outlet.Cold.z); |
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| 73 | |
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| [45] | 74 | "Cold Stream Average Mass Density" |
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| [26] | 75 | Properties.Cold.Average.rho = PP.LiquidDensity(Properties.Cold.Average.T,Properties.Cold.Average.P,Inlet.Cold.z); |
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| [45] | 76 | |
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| 77 | "Cold Stream Inlet Mass Density" |
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| [1] | 78 | Properties.Cold.Inlet.rho = PP.LiquidDensity(Inlet.Cold.T,Inlet.Cold.P,Inlet.Cold.z); |
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| [45] | 79 | |
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| 80 | "Cold Stream Outlet Mass Density" |
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| [1] | 81 | Properties.Cold.Outlet.rho = PP.LiquidDensity(Outlet.Cold.T,Outlet.Cold.P,Outlet.Cold.z); |
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| 82 | |
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| [45] | 83 | "Cold Stream Average Viscosity" |
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| [26] | 84 | Properties.Cold.Average.Mu = PP.LiquidViscosity(Properties.Cold.Average.T,Properties.Cold.Average.P,Inlet.Cold.z); |
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| [45] | 85 | |
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| 86 | "Cold Stream inlet Viscosity" |
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| [26] | 87 | Properties.Cold.Inlet.Mu = PP.LiquidViscosity(Inlet.Cold.T,Inlet.Cold.P,Inlet.Cold.z); |
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| [45] | 88 | |
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| 89 | "Cold Stream Outlet Viscosity" |
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| [26] | 90 | Properties.Cold.Outlet.Mu = PP.LiquidViscosity(Outlet.Cold.T,Outlet.Cold.P,Outlet.Cold.z); |
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| [1] | 91 | |
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| [45] | 92 | "Cold Stream Average Conductivity" |
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| [26] | 93 | Properties.Cold.Average.K = PP.LiquidThermalConductivity(Properties.Cold.Average.T,Properties.Cold.Average.P,Inlet.Cold.z); |
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| [45] | 94 | |
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| 95 | "Cold Stream Inlet Conductivity" |
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| [26] | 96 | Properties.Cold.Inlet.K = PP.LiquidThermalConductivity(Inlet.Cold.T,Inlet.Cold.P,Inlet.Cold.z); |
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| [45] | 97 | |
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| 98 | "Cold Stream Outlet Conductivity" |
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| [26] | 99 | Properties.Cold.Outlet.K = PP.LiquidThermalConductivity(Outlet.Cold.T,Outlet.Cold.P,Outlet.Cold.z); |
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| [1] | 100 | |
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| [45] | 101 | "Cold Stream Heat Capacity at Wall Temperature" |
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| [1] | 102 | Properties.Cold.Wall.Cp = PP.LiquidCp(Properties.Cold.Wall.Twall,Properties.Cold.Average.P,Inlet.Cold.z); |
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| 103 | |
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| [45] | 104 | "Cold Stream Viscosity at Wall Temperature" |
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| [26] | 105 | Properties.Cold.Wall.Mu = PP.LiquidViscosity(Properties.Cold.Wall.Twall,Properties.Cold.Average.P,Inlet.Cold.z); |
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| [1] | 106 | |
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| [45] | 107 | "Cold Stream Conductivity at Wall Temperature" |
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| [26] | 108 | Properties.Cold.Wall.K = PP.LiquidThermalConductivity(Properties.Cold.Wall.Twall,Properties.Cold.Average.P,Inlet.Cold.z); |
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| [1] | 109 | |
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| 110 | |
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| 111 | else |
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| 112 | |
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| [45] | 113 | "Cold Stream Average Heat Capacity" |
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| [1] | 114 | Properties.Cold.Average.Cp = PP.VapourCp(Properties.Cold.Average.T,Properties.Cold.Average.P,Inlet.Cold.z); |
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| [45] | 115 | |
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| 116 | "Cold Stream Inlet Heat Capacity" |
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| [1] | 117 | Properties.Cold.Inlet.Cp = PP.VapourCp(Inlet.Cold.T,Inlet.Cold.P,Inlet.Cold.z); |
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| [45] | 118 | |
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| 119 | "Cold Stream Outlet Heat Capacity" |
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| [1] | 120 | Properties.Cold.Outlet.Cp = PP.VapourCp(Outlet.Cold.T,Outlet.Cold.P,Outlet.Cold.z); |
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| 121 | |
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| [45] | 122 | "Cold Stream Average Mass Density" |
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| [26] | 123 | Properties.Cold.Average.rho = PP.VapourDensity(Properties.Cold.Average.T,Properties.Cold.Average.P,Inlet.Cold.z); |
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| [45] | 124 | |
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| 125 | "Cold Stream Inlet Mass Density" |
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| [1] | 126 | Properties.Cold.Inlet.rho = PP.VapourDensity(Inlet.Cold.T,Inlet.Cold.P,Inlet.Cold.z); |
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| [45] | 127 | |
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| 128 | "Cold Stream Outlet Mass Density" |
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| [1] | 129 | Properties.Cold.Outlet.rho = PP.VapourDensity(Outlet.Cold.T,Outlet.Cold.P,Outlet.Cold.z); |
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| 130 | |
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| [45] | 131 | "Cold Stream Average Viscosity " |
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| [26] | 132 | Properties.Cold.Average.Mu = PP.VapourViscosity(Properties.Cold.Average.T,Properties.Cold.Average.P,Inlet.Cold.z); |
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| [45] | 133 | |
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| 134 | "Cold Stream Inlet Viscosity " |
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| [26] | 135 | Properties.Cold.Inlet.Mu = PP.VapourViscosity(Inlet.Cold.T,Inlet.Cold.P,Inlet.Cold.z); |
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| [45] | 136 | |
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| 137 | "Cold Stream Outlet Viscosity " |
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| [26] | 138 | Properties.Cold.Outlet.Mu = PP.VapourViscosity(Outlet.Cold.T,Outlet.Cold.P,Outlet.Cold.z); |
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| [1] | 139 | |
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| [45] | 140 | "Cold Stream Average Conductivity " |
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| [26] | 141 | Properties.Cold.Average.K = PP.VapourThermalConductivity(Properties.Cold.Average.T,Properties.Cold.Average.P,Inlet.Cold.z); |
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| [45] | 142 | |
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| 143 | "Cold Stream Inlet Conductivity " |
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| [26] | 144 | Properties.Cold.Inlet.K = PP.VapourThermalConductivity(Inlet.Cold.T,Inlet.Cold.P,Inlet.Cold.z); |
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| [45] | 145 | |
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| 146 | "Cold Stream Outlet Conductivity " |
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| [26] | 147 | Properties.Cold.Outlet.K = PP.VapourThermalConductivity(Outlet.Cold.T,Outlet.Cold.P,Outlet.Cold.z); |
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| [1] | 148 | |
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| [45] | 149 | "Cold Stream Heat Capacity at Wall Temperature" |
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| [1] | 150 | Properties.Cold.Wall.Cp = PP.VapourCp(Properties.Cold.Wall.Twall,Properties.Cold.Average.P,Inlet.Cold.z); |
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| 151 | |
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| 152 | |
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| [45] | 153 | "Cold Stream Viscosity at Wall Temperature" |
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| [26] | 154 | Properties.Cold.Wall.Mu = PP.VapourViscosity(Properties.Cold.Wall.Twall,Properties.Cold.Average.P,Inlet.Cold.z); |
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| [1] | 155 | |
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| [45] | 156 | "Cold Stream Conductivity at Wall Temperature" |
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| [26] | 157 | Properties.Cold.Wall.K = PP.VapourThermalConductivity(Properties.Cold.Wall.Twall,Properties.Cold.Average.P,Inlet.Cold.z); |
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| [1] | 158 | |
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| 159 | |
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| 160 | |
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| 161 | end |
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| 162 | |
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| 163 | if Inlet.Hot.v equal 0 |
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| 164 | |
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| 165 | then |
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| 166 | |
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| [68] | 167 | "Hot Stream Average Heat Capacity" |
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| [1] | 168 | Properties.Hot.Average.Cp = PP.LiquidCp(Properties.Hot.Average.T,Properties.Hot.Average.P,Inlet.Hot.z); |
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| [68] | 169 | |
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| 170 | "Hot Stream Inlet Heat Capacity" |
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| [1] | 171 | Properties.Hot.Inlet.Cp = PP.LiquidCp(Inlet.Hot.T,Inlet.Hot.P,Inlet.Hot.z); |
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| [68] | 172 | |
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| 173 | "Hot Stream Outlet Heat Capacity" |
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| [1] | 174 | Properties.Hot.Outlet.Cp = PP.LiquidCp(Outlet.Hot.T,Outlet.Hot.P,Outlet.Hot.z); |
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| 175 | |
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| [68] | 176 | "Hot Stream Average Mass Density" |
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| [1] | 177 | Properties.Hot.Average.rho = PP.LiquidDensity(Properties.Hot.Average.T,Properties.Hot.Average.P,Inlet.Hot.z); |
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| [68] | 178 | |
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| 179 | "Hot Stream Inlet Mass Density" |
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| [1] | 180 | Properties.Hot.Inlet.rho = PP.LiquidDensity(Inlet.Hot.T,Inlet.Hot.P,Inlet.Hot.z); |
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| [68] | 181 | |
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| 182 | "Hot Stream Outlet Mass Density" |
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| [1] | 183 | Properties.Hot.Outlet.rho = PP.LiquidDensity(Outlet.Hot.T,Outlet.Hot.P,Outlet.Hot.z); |
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| 184 | |
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| [68] | 185 | "Hot Stream Average Viscosity" |
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| [1] | 186 | Properties.Hot.Average.Mu = PP.LiquidViscosity(Properties.Hot.Average.T,Properties.Hot.Average.P,Inlet.Hot.z); |
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| [68] | 187 | |
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| 188 | "Hot Stream Inlet Viscosity" |
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| [1] | 189 | Properties.Hot.Inlet.Mu = PP.LiquidViscosity(Inlet.Hot.T,Inlet.Hot.P,Inlet.Hot.z); |
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| [68] | 190 | |
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| 191 | "Hot Stream Outlet Viscosity" |
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| [1] | 192 | Properties.Hot.Outlet.Mu = PP.LiquidViscosity(Outlet.Hot.T,Outlet.Hot.P,Outlet.Hot.z); |
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| 193 | |
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| [68] | 194 | "Hot Stream Average Conductivity" |
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| 195 | Properties.Hot.Average.K = PP.LiquidThermalConductivity(Properties.Hot.Average.T,Properties.Hot.Average.P,Inlet.Hot.z); |
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| [1] | 196 | |
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| [68] | 197 | "Hot Stream Inlet Conductivity" |
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| 198 | Properties.Hot.Inlet.K = PP.LiquidThermalConductivity(Inlet.Hot.T,Inlet.Hot.P,Inlet.Hot.z); |
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| [1] | 199 | |
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| [68] | 200 | "Hot Stream Outlet Conductivity" |
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| 201 | Properties.Hot.Outlet.K = PP.LiquidThermalConductivity(Outlet.Hot.T,Outlet.Hot.P,Outlet.Hot.z); |
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| [1] | 202 | |
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| [68] | 203 | "Hot Stream Heat Capacity at Wall Temperature" |
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| 204 | Properties.Hot.Wall.Cp = PP.LiquidCp(Properties.Hot.Wall.Twall,Properties.Hot.Average.P,Inlet.Hot.z); |
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| 205 | |
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| 206 | "Hot Stream Viscosity at Wall Temperature" |
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| 207 | Properties.Hot.Wall.Mu = PP.LiquidViscosity(Properties.Hot.Wall.Twall,Properties.Hot.Average.P,Inlet.Hot.z); |
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| 208 | |
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| 209 | "Hot Stream Conductivity at Wall Temperature" |
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| 210 | Properties.Hot.Wall.K = PP.LiquidThermalConductivity(Properties.Hot.Wall.Twall,Properties.Hot.Average.P,Inlet.Hot.z); |
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| [1] | 211 | |
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| 212 | |
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| 213 | else |
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| 214 | |
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| [68] | 215 | "Hot Stream Average Heat Capacity" |
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| [1] | 216 | Properties.Hot.Average.Cp = PP.VapourCp(Properties.Hot.Average.T,Properties.Hot.Average.P,Inlet.Hot.z); |
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| [68] | 217 | |
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| 218 | "Hot Stream Inlet Heat Capacity" |
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| [1] | 219 | Properties.Hot.Inlet.Cp = PP.VapourCp(Inlet.Hot.T,Inlet.Hot.P,Inlet.Hot.z); |
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| [68] | 220 | |
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| 221 | "Hot Stream Outlet Heat Capacity" |
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| [1] | 222 | Properties.Hot.Outlet.Cp = PP.VapourCp(Outlet.Hot.T,Outlet.Hot.P,Outlet.Hot.z); |
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| 223 | |
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| [68] | 224 | "Hot Stream Average Mass Density" |
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| [1] | 225 | Properties.Hot.Average.rho = PP.VapourDensity(Properties.Hot.Average.T,Properties.Hot.Average.P,Inlet.Hot.z); |
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| [68] | 226 | |
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| 227 | "Hot Stream Inlet Mass Density" |
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| [1] | 228 | Properties.Hot.Inlet.rho = PP.VapourDensity(Inlet.Hot.T,Inlet.Hot.P,Inlet.Hot.z); |
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| [68] | 229 | |
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| 230 | "Hot Stream Outlet Mass Density" |
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| [1] | 231 | Properties.Hot.Outlet.rho = PP.VapourDensity(Outlet.Hot.T,Outlet.Hot.P,Outlet.Hot.z); |
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| 232 | |
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| [68] | 233 | "Hot Stream Average Viscosity" |
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| [1] | 234 | Properties.Hot.Average.Mu = PP.VapourViscosity(Properties.Hot.Average.T,Properties.Hot.Average.P,Inlet.Hot.z); |
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| [68] | 235 | |
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| 236 | "Hot Stream Inlet Viscosity" |
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| [1] | 237 | Properties.Hot.Inlet.Mu = PP.VapourViscosity(Inlet.Hot.T,Inlet.Hot.P,Inlet.Hot.z); |
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| [68] | 238 | |
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| 239 | "Hot Stream Outlet Viscosity" |
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| [1] | 240 | Properties.Hot.Outlet.Mu = PP.VapourViscosity(Outlet.Hot.T,Outlet.Hot.P,Outlet.Hot.z); |
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| 241 | |
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| [68] | 242 | "Hot Stream Average Conductivity" |
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| 243 | Properties.Hot.Average.K = PP.VapourThermalConductivity(Properties.Hot.Average.T,Properties.Hot.Average.P,Inlet.Hot.z); |
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| [1] | 244 | |
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| [68] | 245 | "Hot Stream Inlet Conductivity" |
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| 246 | Properties.Hot.Inlet.K = PP.VapourThermalConductivity(Inlet.Hot.T,Inlet.Hot.P,Inlet.Hot.z); |
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| 247 | |
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| 248 | "Hot Stream Outlet Conductivity" |
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| 249 | Properties.Hot.Outlet.K = PP.VapourThermalConductivity(Outlet.Hot.T,Outlet.Hot.P,Outlet.Hot.z); |
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| [1] | 250 | |
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| [68] | 251 | "Hot Stream Heat Capacity at Wall Temperature" |
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| 252 | Properties.Hot.Wall.Cp = PP.VapourCp(Properties.Hot.Wall.Twall,Properties.Hot.Average.P,Inlet.Hot.z); |
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| [1] | 253 | |
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| [68] | 254 | "Hot Stream Viscosity at Wall Temperature" |
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| 255 | Properties.Hot.Wall.Mu = PP.VapourViscosity(Properties.Hot.Wall.Twall,Properties.Hot.Average.P,Inlet.Hot.z); |
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| [1] | 256 | |
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| [68] | 257 | "Hot Stream Conductivity at Wall Temperature" |
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| 258 | Properties.Hot.Wall.K = PP.VapourThermalConductivity(Properties.Hot.Wall.Twall,Properties.Hot.Average.P,Inlet.Hot.z); |
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| [1] | 259 | |
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| [68] | 260 | |
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| [1] | 261 | end |
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| 262 | |
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| [26] | 263 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
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| 264 | # Thermal Details # |
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| 265 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
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| 266 | |
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| [1] | 267 | "Hot Stream Heat Capacity" |
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| 268 | Details.Ch =Inlet.Hot.F*Properties.Hot.Average.Cp; |
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| 269 | |
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| 270 | "Cold Stream Heat Capacity" |
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| 271 | Details.Cc =Inlet.Cold.F*Properties.Cold.Average.Cp; |
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| 272 | |
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| [26] | 273 | "Minimum Heat Capacity" |
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| 274 | Details.Cmin = min([Details.Ch,Details.Cc]); |
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| 275 | |
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| 276 | "Maximum Heat Capacity" |
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| 277 | Details.Cmax = max([Details.Ch,Details.Cc]); |
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| 278 | |
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| [1] | 279 | "Heat Capacity Ratio" |
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| [26] | 280 | Details.Cr = Details.Cmin/Details.Cmax; |
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| [1] | 281 | |
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| [26] | 282 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
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| 283 | # Energy Balance |
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| 284 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
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| 285 | |
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| [1] | 286 | "Energy Balance Hot Stream" |
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| 287 | Details.Q = Inlet.Hot.F*(Inlet.Hot.h-Outlet.Hot.h); |
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| 288 | |
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| 289 | "Energy Balance Cold Stream" |
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| 290 | Details.Q =-Inlet.Cold.F*(Inlet.Cold.h-Outlet.Cold.h); |
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| 291 | |
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| [26] | 292 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
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| 293 | # Material Balance |
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| 294 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
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| [1] | 295 | "Flow Mass Inlet Cold Stream" |
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| 296 | Properties.Cold.Inlet.Fw = sum(M*Inlet.Cold.z)*Inlet.Cold.F; |
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| 297 | |
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| 298 | "Flow Mass Outlet Cold Stream" |
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| 299 | Properties.Cold.Outlet.Fw = sum(M*Outlet.Cold.z)*Outlet.Cold.F; |
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| 300 | |
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| 301 | "Flow Mass Inlet Hot Stream" |
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| 302 | Properties.Hot.Inlet.Fw = sum(M*Inlet.Hot.z)*Inlet.Hot.F; |
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| 303 | |
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| 304 | "Flow Mass Outlet Hot Stream" |
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| 305 | Properties.Hot.Outlet.Fw = sum(M*Outlet.Hot.z)*Outlet.Hot.F; |
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| 306 | |
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| 307 | "Molar Balance Hot Stream" |
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| 308 | Inlet.Hot.F = Outlet.Hot.F; |
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| 309 | |
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| 310 | "Molar Balance Cold Stream" |
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| 311 | Inlet.Cold.F = Outlet.Cold.F; |
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| 312 | |
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| [26] | 313 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
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| 314 | # Constraints |
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| 315 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
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| [1] | 316 | "Hot Stream Molar Fraction Constraint" |
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| 317 | Outlet.Hot.z=Inlet.Hot.z; |
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| 318 | |
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| 319 | "Cold Stream Molar Fraction Constraint" |
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| 320 | Outlet.Cold.z=Inlet.Cold.z; |
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| 321 | |
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| 322 | "No Phase Change In Cold Stream" |
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| 323 | Inlet.Cold.v=Outlet.Cold.v; |
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| 324 | |
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| 325 | "No Phase Change In Hot Stream" |
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| 326 | Inlet.Hot.v=Outlet.Hot.v; |
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| 327 | |
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| 328 | end |
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| 329 | |
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| 330 | Model Heatex_Detailed as HeatExchangerDetailed_Basic |
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| 331 | |
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| 332 | PARAMETERS |
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| 333 | |
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| [26] | 334 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
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| 335 | # Basic Parameters # |
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| 336 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
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| 337 | ext PP as CalcObject (Brief="External Physical Properties"); |
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| 338 | side as Integer (Brief="Fluid Alocation Flag",Lower=0,Upper=1); |
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| [1] | 339 | Pi as constant (Brief="Pi Number",Default=3.14159265); |
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| [26] | 340 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
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| 341 | # Shell Geometrical Parameters # |
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| 342 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
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| [1] | 343 | Tpass as Integer (Brief="Number of Tube Passes",Lower=1); |
|---|
| 344 | Nss as Integer (Brief="Number of Sealing Strips pairs",Lower=1); |
|---|
| 345 | Dishell as length (Brief="Inside Shell Diameter",Lower=10e-6); |
|---|
| 346 | Donozzle_Shell as length (Brief="Shell Outlet Nozzle Diameter",Lower=10e-6); |
|---|
| 347 | Dinozzle_Shell as length (Brief="Shell Inlet Nozzle Diameter",Lower=10e-6); |
|---|
| 348 | Hinozzle_Shell as length (Brief="Height Under Shell Inlet Nozzle",Lower=10e-6); |
|---|
| 349 | Honozzle_Shell as length (Brief="Height Under Shell Outlet Nozzle",Lower=10e-6); |
|---|
| 350 | Lcf as length (Brief="Bundle-to-Shell Clearance",Lower=10e-8); |
|---|
| [26] | 351 | |
|---|
| 352 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| 353 | # Tubes Geometrical Parameters # |
|---|
| 354 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| 355 | Ntt as Integer (Brief="Total Number of Tubes in Shell",Default=100,Lower=1); |
|---|
| 356 | Pattern as Integer (Brief="Tube Layout Characteristic Angle",Lower=30); |
|---|
| 357 | Ltube as length (Brief="Effective Tube Length",Lower=0.1); |
|---|
| 358 | pitch as length (Brief="Tube Pitch",Lower=1e-8); |
|---|
| 359 | Kwall as conductivity (Brief="Tube Wall Material Thermal Conductivity"); |
|---|
| 360 | Dotube as length (Brief="Tube Outside Diameter",Lower=10e-6); |
|---|
| 361 | Ditube as length (Brief="Tube Inside Diameter",Lower=10e-6); |
|---|
| 362 | Donozzle_Tube as length (Brief="Tube Outlet Nozzle Diameter",Lower=10e-6); |
|---|
| 363 | Dinozzle_Tube as length (Brief="Tube Inlett Nozzle Diameter",Lower=10e-6); |
|---|
| 364 | |
|---|
| 365 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| 366 | # Baffles Geometrical Parameters # |
|---|
| 367 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| 368 | Bc as Integer (Brief="Baffle Cut",Default=25,Lower=25); |
|---|
| 369 | Nb as Real (Brief="Number of Baffles",Lower=1); |
|---|
| 370 | Lcd as length (Brief="Baffle-to-Shell Clearance",Lower=10e-8); |
|---|
| 371 | Ltd as length (Brief="Tube-to-Bafflehole Clearance",Lower=10e-8); |
|---|
| 372 | |
|---|
| 373 | SET |
|---|
| 374 | |
|---|
| 375 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| 376 | # Set Parameters for heatex Calculation # |
|---|
| 377 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| 378 | Pi = 3.14159265; |
|---|
| 379 | HE.Tpass = Tpass; |
|---|
| 380 | HE.Nss = Nss; |
|---|
| 381 | HE.Ntt = Ntt; |
|---|
| 382 | HE.Pattern = Pattern; |
|---|
| 383 | HE.Bc = Bc; |
|---|
| 384 | HE.Donozzle_Shell = Donozzle_Shell; |
|---|
| 385 | HE.Dinozzle_Shell = Dinozzle_Shell; |
|---|
| 386 | HE.Honozzle_Shell = Honozzle_Shell; |
|---|
| 387 | HE.Hinozzle_Shell = Hinozzle_Shell; |
|---|
| 388 | HE.Donozzle_Tube = Donozzle_Tube; |
|---|
| 389 | HE.Dinozzle_Tube = Dinozzle_Tube; |
|---|
| 390 | HE.Nb = Nb; |
|---|
| 391 | HE.Dishell = Dishell; |
|---|
| 392 | HE.Lcf = Lcf; |
|---|
| 393 | HE.Ltube = Ltube; |
|---|
| 394 | HE.pitch = pitch; |
|---|
| 395 | HE.Dotube = Dotube; |
|---|
| 396 | HE.Ditube = Ditube; |
|---|
| 397 | HE.Lcd = Lcd; |
|---|
| 398 | HE.Ltd = Ltd; |
|---|
| 399 | side = HE.FluidAlocation(); |
|---|
| 400 | |
|---|
| [1] | 401 | EQUATIONS |
|---|
| 402 | |
|---|
| [26] | 403 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| 404 | # Heat Transfer Correction Factors # |
|---|
| 405 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| [1] | 406 | "Ji Factor" |
|---|
| 407 | Shell.HeatTransfer.Ji = HE.JiFactor(Shell.HeatTransfer.Re); |
|---|
| 408 | |
|---|
| 409 | "Jc Factor" |
|---|
| 410 | Shell.HeatTransfer.Jc = HE.JcFactor(); |
|---|
| 411 | |
|---|
| 412 | "Jl Factor" |
|---|
| 413 | Shell.HeatTransfer.Jl = HE.JlFactor(Shell.HeatTransfer.Sm); |
|---|
| 414 | |
|---|
| 415 | "Jb Factor" |
|---|
| 416 | Shell.HeatTransfer.Jb = HE.JbFactor(Shell.HeatTransfer.Re,Baffles.Ls,Shell.HeatTransfer.Sm); |
|---|
| 417 | |
|---|
| 418 | "Jr Factor" |
|---|
| 419 | Shell.HeatTransfer.Jr = HE.JrFactor(Shell.HeatTransfer.Re); |
|---|
| 420 | |
|---|
| 421 | "Total J Factor" |
|---|
| [26] | 422 | Shell.HeatTransfer.Jtotal = Shell.HeatTransfer.Jc*Shell.HeatTransfer.Jl*Shell.HeatTransfer.Jb*Shell.HeatTransfer.Jr*Shell.HeatTransfer.Js; |
|---|
| [1] | 423 | |
|---|
| [26] | 424 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| 425 | # Nozzles rho-V^2 # |
|---|
| 426 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| [1] | 427 | |
|---|
| [26] | 428 | if side equal 1 |
|---|
| [1] | 429 | |
|---|
| [26] | 430 | then |
|---|
| 431 | |
|---|
| 432 | "Shell Side inlet Nozzle rho-V^2" |
|---|
| 433 | Shell.PressureDrop.RVsquare_in = Properties.Hot.Inlet.rho*(Shell.PressureDrop.Vnozzle_in)^2; |
|---|
| 434 | |
|---|
| 435 | "Shell Side Outlet Nozzle rho-V^2" |
|---|
| 436 | Shell.PressureDrop.RVsquare_out = Properties.Hot.Outlet.rho*(Shell.PressureDrop.Vnozzle_out)^2; |
|---|
| [1] | 437 | |
|---|
| [26] | 438 | else |
|---|
| 439 | |
|---|
| 440 | "Shell Side inlet Nozzle rho-V^2" |
|---|
| 441 | Shell.PressureDrop.RVsquare_in = Properties.Cold.Inlet.rho*(Shell.PressureDrop.Vnozzle_in)^2; |
|---|
| 442 | |
|---|
| 443 | "Shell Side Outlet Nozzle rho-V^2" |
|---|
| 444 | Shell.PressureDrop.RVsquare_out = Properties.Cold.Outlet.rho*(Shell.PressureDrop.Vnozzle_out)^2; |
|---|
| 445 | |
|---|
| 446 | end |
|---|
| 447 | |
|---|
| 448 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| 449 | # Phi correction # |
|---|
| 450 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| 451 | |
|---|
| 452 | if side equal 1 |
|---|
| 453 | |
|---|
| 454 | then |
|---|
| 455 | |
|---|
| [1] | 456 | "Shell Side Phi correction" |
|---|
| [68] | 457 | Shell.HeatTransfer.Phi = HE.PhiCorrection(Properties.Hot.Average.Mu,Properties.Hot.Wall.Mu); |
|---|
| [1] | 458 | |
|---|
| 459 | "Tube Side Phi correction" |
|---|
| 460 | Tubes.HeatTransfer.Phi = HE.PhiCorrection(Properties.Cold.Average.Mu,Properties.Cold.Wall.Mu); |
|---|
| 461 | |
|---|
| 462 | else |
|---|
| 463 | |
|---|
| 464 | "Shell Side Phi correction" |
|---|
| [68] | 465 | Shell.HeatTransfer.Phi = HE.PhiCorrection(Properties.Cold.Average.Mu,Properties.Cold.Wall.Mu); |
|---|
| [1] | 466 | |
|---|
| 467 | "Tube Side Phi correction" |
|---|
| 468 | Tubes.HeatTransfer.Phi = HE.PhiCorrection(Properties.Hot.Average.Mu,Properties.Hot.Wall.Mu); |
|---|
| 469 | |
|---|
| 470 | end |
|---|
| 471 | |
|---|
| [26] | 472 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| 473 | # # |
|---|
| 474 | # # |
|---|
| 475 | # # |
|---|
| 476 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| [1] | 477 | |
|---|
| 478 | if side equal 1 |
|---|
| 479 | |
|---|
| 480 | then |
|---|
| 481 | |
|---|
| [45] | 482 | "Hot Wall Temperature" |
|---|
| [68] | 483 | Properties.Hot.Wall.Twall = (Properties.Hot.Average.T+Properties.Cold.Average.T)/2; |
|---|
| [1] | 484 | |
|---|
| [45] | 485 | "ColdWall Temperature" |
|---|
| 486 | Properties.Cold.Wall.Twall = (Properties.Hot.Average.T+Properties.Cold.Average.T)/2; |
|---|
| [1] | 487 | |
|---|
| 488 | "Tube Side Velocity" |
|---|
| [68] | 489 | Tubes.HeatTransfer.Vtube = Properties.Cold.Inlet.Fw*Tpass/((Pi*Ditube*Ditube/4)*Properties.Cold.Average.rho*Ntt); |
|---|
| [1] | 490 | |
|---|
| 491 | "Tube Side Reynolds Number" |
|---|
| [68] | 492 | Tubes.HeatTransfer.Re = (Properties.Cold.Average.rho*Tubes.HeatTransfer.Vtube*Ditube)/Properties.Cold.Average.Mu; |
|---|
| [1] | 493 | |
|---|
| 494 | "Tube Side Prandtl Number" |
|---|
| [68] | 495 | Tubes.HeatTransfer.PR = ((Properties.Cold.Average.Cp/Properties.Cold.Average.Mw)*Properties.Cold.Average.Mu)/Properties.Cold.Average.K; |
|---|
| [1] | 496 | |
|---|
| 497 | "Tube Side Prandtl Number at Wall Temperature" |
|---|
| [68] | 498 | Tubes.HeatTransfer.PRw = ((Properties.Cold.Wall.Cp/Properties.Cold.Average.Mw)*Properties.Cold.Wall.Mu)/Properties.Cold.Wall.K; |
|---|
| [1] | 499 | |
|---|
| 500 | "Tube Side Film Coefficient" |
|---|
| [68] | 501 | Tubes.HeatTransfer.htube = HE.TubeFilmCoeff(Tubes.HeatTransfer.Re,Tubes.HeatTransfer.PR,Properties.Cold.Average.K)*Tubes.HeatTransfer.Phi; |
|---|
| [45] | 502 | |
|---|
| [1] | 503 | "Shell Side Prandtl Number" |
|---|
| [68] | 504 | Shell.HeatTransfer.PR = ((Properties.Hot.Average.Cp/Properties.Hot.Average.Mw)*Properties.Hot.Average.Mu)/Properties.Hot.Average.K; |
|---|
| [1] | 505 | |
|---|
| 506 | "Shell Side Prandtl Number at Wall Temperature" |
|---|
| [68] | 507 | Shell.HeatTransfer.PRw = ((Properties.Hot.Wall.Cp/Properties.Hot.Average.Mw)*Properties.Hot.Wall.Mu)/Properties.Hot.Wall.K; |
|---|
| [1] | 508 | |
|---|
| 509 | "Tube Side Pressure Drop" |
|---|
| 510 | Tubes.PressureDrop.PdTube = HE.DeltaPtube(Tubes.HeatTransfer.Re,Properties.Cold.Average.rho,Tubes.HeatTransfer.Vtube,Tubes.HeatTransfer.Phi); |
|---|
| 511 | |
|---|
| 512 | "Pressure Drop Tube Side Inlet Nozzle" |
|---|
| 513 | Tubes.PressureDrop.Pdnozzle_in = HE.DeltaPtubeNozzlein(Properties.Cold.Inlet.rho,Properties.Cold.Inlet.Fw); |
|---|
| 514 | |
|---|
| 515 | "Velocity Tube Side Inlet Nozzle" |
|---|
| 516 | Tubes.PressureDrop.Vnozzle_in = HE.TubeVelocityNozzlein(Properties.Cold.Inlet.rho,Properties.Cold.Inlet.Fw); |
|---|
| 517 | |
|---|
| 518 | "Pressure Drop Tube Side Outlet Nozzle" |
|---|
| 519 | Tubes.PressureDrop.Pdnozzle_out = HE.DeltaPtubeNozzleout(Properties.Cold.Outlet.rho,Properties.Cold.Inlet.Fw); |
|---|
| 520 | |
|---|
| 521 | "Velocity Tube Side Outlet Nozzle" |
|---|
| 522 | Tubes.PressureDrop.Vnozzle_out = HE.TubeVelocityNozzleout(Properties.Cold.Outlet.rho,Properties.Cold.Inlet.Fw); |
|---|
| 523 | |
|---|
| 524 | "Shell Pressure Drop Inlet Nozzle" |
|---|
| 525 | Shell.PressureDrop.Pdnozzle_in = HE.DeltaPshellNozzleIn(Properties.Hot.Inlet.rho,Properties.Hot.Inlet.Fw); |
|---|
| 526 | |
|---|
| 527 | "Velocity Shell Side Inlet Nozzle" |
|---|
| 528 | Shell.PressureDrop.Vnozzle_in = HE.ShellVelocityNozzleIn(Properties.Hot.Inlet.rho,Properties.Hot.Inlet.Fw); |
|---|
| 529 | |
|---|
| 530 | "Shell Pressure Drop Outlet Nozzle" |
|---|
| [68] | 531 | Shell.PressureDrop.Pdnozzle_out = HE.DeltaPshellNozzleOut(Properties.Hot.Outlet.rho,Properties.Hot.Inlet.Fw); |
|---|
| [1] | 532 | |
|---|
| 533 | "Velocity Shell Side Outlet Nozzle" |
|---|
| 534 | Shell.PressureDrop.Vnozzle_out =HE.ShellVelocityNozzleOut(Properties.Hot.Outlet.rho,Properties.Hot.Inlet.Fw); |
|---|
| 535 | |
|---|
| 536 | "Pressure Drop Hot Stream" |
|---|
| 537 | Outlet.Hot.P = Inlet.Hot.P- Shell.PressureDrop.Pdtotal; |
|---|
| 538 | |
|---|
| 539 | "Pressure Drop Cold Stream" |
|---|
| 540 | Outlet.Cold.P = Inlet.Cold.P - Tubes.PressureDrop.Pdtotal; |
|---|
| 541 | |
|---|
| 542 | |
|---|
| 543 | else |
|---|
| 544 | |
|---|
| [45] | 545 | "Hot Wall Temperature" |
|---|
| 546 | Properties.Hot.Wall.Twall = (Properties.Hot.Average.T+Properties.Cold.Average.T)/2; |
|---|
| [1] | 547 | |
|---|
| [45] | 548 | "Cold Wall Temperature" |
|---|
| 549 | Properties.Cold.Wall.Twall = (Properties.Hot.Average.T+Properties.Cold.Average.T)/2; |
|---|
| [1] | 550 | |
|---|
| 551 | "Tube Side Velocity" |
|---|
| [45] | 552 | Tubes.HeatTransfer.Vtube = Properties.Hot.Inlet.Fw*Tpass/((Pi*Ditube*Ditube/4)*Properties.Hot.Average.rho*Ntt); |
|---|
| [1] | 553 | |
|---|
| 554 | "Tube Side Reynolds Number" |
|---|
| [45] | 555 | Tubes.HeatTransfer.Re=(Properties.Hot.Average.rho*Tubes.HeatTransfer.Vtube*Ditube)/Properties.Hot.Average.Mu; |
|---|
| 556 | |
|---|
| [1] | 557 | "Tube Side Prandtl Number" |
|---|
| [45] | 558 | Tubes.HeatTransfer.PR = ((Properties.Hot.Average.Cp/Properties.Hot.Average.Mw)*Properties.Hot.Average.Mu)/Properties.Hot.Average.K; |
|---|
| [1] | 559 | |
|---|
| 560 | "Tube Side Prandtl Number at Wall" |
|---|
| [45] | 561 | Tubes.HeatTransfer.PRw = ((Properties.Hot.Wall.Cp/Properties.Hot.Average.Mw)*Properties.Hot.Wall.Mu)/Properties.Hot.Wall.K; |
|---|
| [1] | 562 | |
|---|
| 563 | "Tube Side Film Coefficient" |
|---|
| [45] | 564 | Tubes.HeatTransfer.htube= HE.TubeFilmCoeff(Tubes.HeatTransfer.Re,Tubes.HeatTransfer.PR,Properties.Hot.Average.K)*Tubes.HeatTransfer.Phi; |
|---|
| [1] | 565 | |
|---|
| 566 | "Shell Side Prandtl Number" |
|---|
| [45] | 567 | Shell.HeatTransfer.PR = ((Properties.Cold.Average.Cp/Properties.Cold.Average.Mw)*Properties.Cold.Average.Mu)/Properties.Cold.Average.K; |
|---|
| [1] | 568 | |
|---|
| 569 | "Shell Side Prandtl Number at Wall" |
|---|
| [45] | 570 | Shell.HeatTransfer.PRw=((Properties.Cold.Wall.Cp/Properties.Cold.Average.Mw)*Properties.Cold.Wall.Mu)/Properties.Cold.Wall.K; |
|---|
| [1] | 571 | |
|---|
| 572 | "Tube Side Pressure Drop" |
|---|
| 573 | Tubes.PressureDrop.PdTube = HE.DeltaPtube(Tubes.HeatTransfer.Re,Properties.Hot.Average.rho,Tubes.HeatTransfer.Vtube,Tubes.HeatTransfer.Phi); |
|---|
| 574 | |
|---|
| 575 | "Pressure Drop Tube Side Inlet Nozzle" |
|---|
| 576 | Tubes.PressureDrop.Pdnozzle_in = HE.DeltaPtubeNozzlein(Properties.Hot.Inlet.rho,Properties.Hot.Inlet.Fw); |
|---|
| 577 | |
|---|
| 578 | "Velocity Tube Side Inlet Nozzle" |
|---|
| 579 | Tubes.PressureDrop.Vnozzle_in = HE.TubeVelocityNozzlein(Properties.Hot.Inlet.rho,Properties.Hot.Inlet.Fw); |
|---|
| 580 | |
|---|
| 581 | "Pressure Drop Tube Side Outlet Nozzle" |
|---|
| 582 | Tubes.PressureDrop.Pdnozzle_out = HE.DeltaPtubeNozzleout(Properties.Hot.Outlet.rho,Properties.Hot.Inlet.Fw); |
|---|
| 583 | |
|---|
| 584 | "Velocity Tube Side Outlet Nozzle" |
|---|
| 585 | Tubes.PressureDrop.Vnozzle_out = HE.TubeVelocityNozzleout(Properties.Hot.Outlet.rho,Properties.Hot.Inlet.Fw); |
|---|
| 586 | |
|---|
| 587 | "Shell Pressure Drop Inlet Nozzle" |
|---|
| 588 | Shell.PressureDrop.Pdnozzle_in = HE.DeltaPshellNozzleIn(Properties.Cold.Inlet.rho,Properties.Cold.Inlet.Fw); |
|---|
| 589 | |
|---|
| 590 | "Velocity Shell Side Inlet Nozzle" |
|---|
| 591 | Shell.PressureDrop.Vnozzle_in = HE.ShellVelocityNozzleIn(Properties.Cold.Inlet.rho,Properties.Cold.Inlet.Fw); |
|---|
| 592 | |
|---|
| 593 | "Shell Pressure Drop Outlet Nozzle" |
|---|
| 594 | Shell.PressureDrop.Pdnozzle_out = HE.DeltaPshellNozzleOut(Properties.Cold.Outlet.rho,Properties.Cold.Inlet.Fw); |
|---|
| 595 | |
|---|
| 596 | "Velocity Shell Side Outlet Nozzle" |
|---|
| 597 | Shell.PressureDrop.Vnozzle_out = HE.ShellVelocityNozzleOut(Properties.Cold.Outlet.rho,Properties.Cold.Inlet.Fw); |
|---|
| 598 | |
|---|
| 599 | "Pressure Drop Hot Stream" |
|---|
| 600 | Outlet.Hot.P = Inlet.Hot.P- Tubes.PressureDrop.Pdtotal; |
|---|
| 601 | |
|---|
| 602 | "Pressure Drop Cold Stream" |
|---|
| 603 | Outlet.Cold.P = Inlet.Cold.P - Shell.PressureDrop.Pdtotal; |
|---|
| 604 | |
|---|
| 605 | end |
|---|
| 606 | |
|---|
| [26] | 607 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| 608 | # Resistances # |
|---|
| 609 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| [1] | 610 | |
|---|
| 611 | "Tube Resistance" |
|---|
| 612 | Resistances.Rtube*(Tubes.HeatTransfer.htube*Ditube) = Dotube; |
|---|
| 613 | |
|---|
| 614 | "Wall Resistance" |
|---|
| 615 | Resistances.Rwall=Dotube*ln(Dotube/Ditube)/(2*Kwall); |
|---|
| 616 | |
|---|
| 617 | "Shell Resistance" |
|---|
| 618 | Resistances.Rshell*(Shell.HeatTransfer.hshell)=1; |
|---|
| [26] | 619 | |
|---|
| 620 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| 621 | # # |
|---|
| 622 | # # |
|---|
| 623 | # # |
|---|
| 624 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| 625 | |
|---|
| 626 | "Shell Side Cross Flow Area" |
|---|
| 627 | Shell.HeatTransfer.Sm = HE.CrossFlowArea(Baffles.Ls); |
|---|
| [1] | 628 | |
|---|
| 629 | "Overall Heat Transfer Coefficient" |
|---|
| 630 | Details.U=1/(Dotube/(Tubes.HeatTransfer.htube*Ditube)+(Dotube*ln(Dotube/Ditube)/(2*Kwall))+(1/(Shell.HeatTransfer.hshell))); |
|---|
| 631 | |
|---|
| 632 | "Exchange Surface Area" |
|---|
| 633 | Details.A=Pi*Dotube*Ntt*Ltube; |
|---|
| 634 | |
|---|
| 635 | "Baffles Spacing" |
|---|
| 636 | Ltube = Baffles.Lsi+Baffles.Lso+Baffles.Ls*(Nb-1); |
|---|
| 637 | |
|---|
| 638 | end |
|---|
| 639 | |
|---|
| 640 | Model Heatex_Detailed_NTU as Heatex_Detailed |
|---|
| 641 | |
|---|
| 642 | VARIABLES |
|---|
| 643 | |
|---|
| [26] | 644 | Eft as positive (Brief="Effectiveness",Default=0.05,Lower=1e-8); |
|---|
| [1] | 645 | |
|---|
| [26] | 646 | EQUATIONS |
|---|
| 647 | "Duty" |
|---|
| 648 | Details.Q = Eft*Details.Cmin*(Inlet.Hot.T-Inlet.Cold.T); |
|---|
| [1] | 649 | |
|---|
| 650 | end |
|---|
| 651 | |
|---|
| 652 | Model Heatex_Detailed_LMTD as Heatex_Detailed |
|---|
| 653 | |
|---|
| 654 | VARIABLES |
|---|
| [68] | 655 | |
|---|
| [45] | 656 | DT0 as temp_delta (Brief="Temperature Difference at Inlet",Lower=1); |
|---|
| 657 | DTL as temp_delta (Brief="Temperature Difference at Outlet",Lower=1); |
|---|
| 658 | LMTD as temp_delta (Brief="Logarithmic Mean Temperature Difference",Lower=5); |
|---|
| 659 | Fc as positive (Brief="LMTD Correction Factor",Lower=0.4); |
|---|
| 660 | MTD as temp_delta (Brief="Mean Temperature Difference",Lower=5); |
|---|
| [1] | 661 | |
|---|
| 662 | EQUATIONS |
|---|
| [45] | 663 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| 664 | # Log Mean Temperature Difference |
|---|
| 665 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| 666 | if abs(DT0 - DTL) > 0.05*max(abs([DT0,DTL])) |
|---|
| 667 | |
|---|
| 668 | then |
|---|
| 669 | "Log Mean Temperature Difference" |
|---|
| 670 | LMTD= (DT0-DTL)/ln(DT0/DTL); |
|---|
| [1] | 671 | |
|---|
| [45] | 672 | else |
|---|
| 673 | |
|---|
| 674 | if DT0*DTL equal 0 |
|---|
| 675 | |
|---|
| 676 | then |
|---|
| 677 | "Log Mean Temperature Difference" |
|---|
| 678 | LMTD = 0.5*(DT0+DTL); |
|---|
| 679 | |
|---|
| 680 | else |
|---|
| 681 | "Log Mean Temperature Difference" |
|---|
| 682 | LMTD = 0.5*(DT0+DTL)*(1-(DT0-DTL)^2/(DT0*DTL)*(1+(DT0-DTL)^2/(DT0*DTL)/2)/12); |
|---|
| 683 | |
|---|
| 684 | end |
|---|
| 685 | |
|---|
| 686 | end |
|---|
| 687 | |
|---|
| [1] | 688 | "Exchange Surface Area" |
|---|
| 689 | Details.Q = Details.U*Details.A*MTD; |
|---|
| 690 | |
|---|
| 691 | "Mean Temperature Difference" |
|---|
| [45] | 692 | MTD = Fc*LMTD; |
|---|
| [1] | 693 | |
|---|
| 694 | end |
|---|
| 695 | |
|---|
| 696 | Model E_Shell_NTU_Det as Heatex_Detailed_NTU |
|---|
| [26] | 697 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| [1] | 698 | # Shell and Tubes Heat Exchanger with 1 shell pass - LMTD Method |
|---|
| [26] | 699 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| [1] | 700 | EQUATIONS |
|---|
| 701 | |
|---|
| 702 | "TEMA E Shell Effectiveness" |
|---|
| [26] | 703 | # Eft = 2*(1+Details.Cr+sqrt(1+Details.Cr^2)*((1+exp(-Details.NTU*sqrt(1+Details.Cr^2)))/(1-exp(-Details.NTU*sqrt(1+Details.Cr^2)))) )^-1; |
|---|
| 704 | Eft = HE.EshellEffectiveness(Details.Cr,Details.NTU); |
|---|
| [1] | 705 | |
|---|
| 706 | "Js Factor" |
|---|
| 707 | Shell.HeatTransfer.Js = HE.JsFactor(Shell.HeatTransfer.Re,Baffles.Lsi,Baffles.Lso,Baffles.Ls); |
|---|
| 708 | |
|---|
| 709 | if side equal 1 |
|---|
| 710 | |
|---|
| 711 | then |
|---|
| 712 | |
|---|
| 713 | "Shell Side Reynolds Number" |
|---|
| [45] | 714 | Shell.HeatTransfer.Re=(Dotube*Properties.Hot.Inlet.Fw/Shell.HeatTransfer.Sm)/Properties.Hot.Average.Mu; |
|---|
| [1] | 715 | |
|---|
| 716 | "Shell Heat Transfer Coefficient" |
|---|
| [45] | 717 | Shell.HeatTransfer.hshell=Shell.HeatTransfer.Ji*(Properties.Hot.Average.Cp/Properties.Hot.Average.Mw)*(Properties.Hot.Inlet.Fw/Shell.HeatTransfer.Sm)*(Shell.HeatTransfer.PR^(-2/3))*Shell.HeatTransfer.Jtotal*Shell.HeatTransfer.Phi; |
|---|
| [1] | 718 | |
|---|
| 719 | "Shell Pressure Drop Cross Flow" |
|---|
| 720 | Shell.PressureDrop.PdCross = HE.DeltaPcross(Shell.HeatTransfer.Re,Baffles.Ls,Baffles.Lso,Baffles.Lsi,Properties.Hot.Inlet.Fw,Shell.HeatTransfer.Phi,Properties.Hot.Average.rho); |
|---|
| 721 | |
|---|
| 722 | "Shell Pressure Baffle Window" |
|---|
| 723 | Shell.PressureDrop.Pdwindow = HE.DeltaPwindow(Properties.Hot.Inlet.Fw,Shell.HeatTransfer.Sm,Properties.Hot.Average.rho,Properties.Hot.Average.Mu,Baffles.Ls); |
|---|
| 724 | |
|---|
| 725 | "Shell Pressure End Zones" |
|---|
| 726 | Shell.PressureDrop.PdEndZones = HE.DeltaPendZones(Shell.HeatTransfer.Re,Baffles.Ls,Baffles.Lso,Baffles.Lsi,Properties.Hot.Inlet.Fw,Shell.HeatTransfer.Phi,Properties.Hot.Average.rho); |
|---|
| 727 | |
|---|
| 728 | |
|---|
| 729 | else |
|---|
| 730 | |
|---|
| 731 | "Shell Side Reynolds Number" |
|---|
| [45] | 732 | Shell.HeatTransfer.Re=(Dotube*Properties.Cold.Inlet.Fw/Shell.HeatTransfer.Sm)/Properties.Cold.Average.Mu; |
|---|
| [1] | 733 | |
|---|
| 734 | "Shell Heat Transfer Coefficient" |
|---|
| [45] | 735 | Shell.HeatTransfer.hshell=Shell.HeatTransfer.Ji*(Properties.Cold.Average.Cp/Properties.Cold.Average.Mw)*(Properties.Cold.Inlet.Fw/Shell.HeatTransfer.Sm)*(Shell.HeatTransfer.PR^(-2/3))*Shell.HeatTransfer.Jtotal*Shell.HeatTransfer.Phi; |
|---|
| [1] | 736 | |
|---|
| 737 | "Shell Pressure Drop Cross Flow" |
|---|
| 738 | Shell.PressureDrop.PdCross = HE.DeltaPcross(Shell.HeatTransfer.Re,Baffles.Ls,Baffles.Lso,Baffles.Lsi,Properties.Cold.Inlet.Fw,Shell.HeatTransfer.Phi,Properties.Cold.Average.rho); |
|---|
| 739 | |
|---|
| 740 | "Shell Pressure Baffle Window" |
|---|
| 741 | Shell.PressureDrop.Pdwindow = HE.DeltaPwindow(Properties.Cold.Inlet.Fw,Shell.HeatTransfer.Sm,Properties.Cold.Average.rho,Properties.Cold.Average.Mu,Baffles.Ls); |
|---|
| 742 | |
|---|
| 743 | "Shell Pressure End Zones" |
|---|
| 744 | Shell.PressureDrop.PdEndZones = HE.DeltaPendZones(Shell.HeatTransfer.Re,Baffles.Ls,Baffles.Lso,Baffles.Lsi,Properties.Cold.Inlet.Fw,Shell.HeatTransfer.Phi,Properties.Cold.Average.rho); |
|---|
| 745 | |
|---|
| 746 | |
|---|
| 747 | end |
|---|
| 748 | |
|---|
| 749 | end |
|---|
| 750 | |
|---|
| 751 | Model F_Shell_NTU_Det as Heatex_Detailed_NTU |
|---|
| [26] | 752 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| [1] | 753 | # Shell and Tubes Heat Exchanger with 1 shell pass - LMTD Method |
|---|
| [26] | 754 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| [1] | 755 | VARIABLES |
|---|
| 756 | |
|---|
| 757 | Eft1 as positive (Brief="Effectiveness Correction",Lower=0.01,Default=0.5); |
|---|
| 758 | |
|---|
| 759 | EQUATIONS |
|---|
| 760 | |
|---|
| 761 | "Effectiveness Correction" |
|---|
| 762 | Eft1 = 2*(1+Details.Cr+sqrt(1+Details.Cr^2)*((1+exp(-Details.NTU*sqrt(1+Details.Cr^2)))/(1-exp(-Details.NTU*sqrt(1+Details.Cr^2)))) )^-1; |
|---|
| 763 | |
|---|
| 764 | "TEMA F Shell Effectiveness" |
|---|
| 765 | Eft = ( ((1-Eft1*Details.Cr)/(1-Eft1))^2 -1 )*( ((1-Eft1*Details.Cr)/(1-Eft1))^2 - Details.Cr )^-1; |
|---|
| 766 | |
|---|
| 767 | "Js Factor" |
|---|
| 768 | Shell.HeatTransfer.Js = HE.JsFactor(Shell.HeatTransfer.Re,Baffles.Lsi,Baffles.Lso,Baffles.Ls); |
|---|
| 769 | |
|---|
| 770 | if side equal 1 |
|---|
| 771 | |
|---|
| 772 | then |
|---|
| 773 | |
|---|
| 774 | "Shell Side Reynolds Number" |
|---|
| [45] | 775 | Shell.HeatTransfer.Re=(Dotube*Properties.Hot.Inlet.Fw/Shell.HeatTransfer.Sm)/Properties.Hot.Average.Mu; |
|---|
| [1] | 776 | |
|---|
| 777 | "Shell Heat Transfer Coefficient" |
|---|
| [45] | 778 | Shell.HeatTransfer.hshell= Shell.HeatTransfer.Ji*(Properties.Hot.Average.Cp/Properties.Hot.Average.Mw)*(Properties.Hot.Inlet.Fw/Shell.HeatTransfer.Sm)*(Shell.HeatTransfer.PR^(-2/3))*Shell.HeatTransfer.Jtotal*Shell.HeatTransfer.Phi; |
|---|
| [1] | 779 | |
|---|
| 780 | "Shell Pressure Drop Cross Flow" |
|---|
| 781 | Shell.PressureDrop.PdCross = HE.DeltaPcross(Shell.HeatTransfer.Re,Baffles.Ls,Baffles.Lso,Baffles.Lsi,Properties.Hot.Inlet.Fw,Shell.HeatTransfer.Phi,Properties.Hot.Average.rho); |
|---|
| 782 | |
|---|
| 783 | "Shell Pressure Baffle Window" |
|---|
| 784 | Shell.PressureDrop.Pdwindow = HE.DeltaPwindow(Properties.Hot.Inlet.Fw,Shell.HeatTransfer.Sm,Properties.Hot.Average.rho,Properties.Hot.Average.Mu,Baffles.Ls); |
|---|
| 785 | |
|---|
| 786 | "Shell Pressure End Zones" |
|---|
| 787 | Shell.PressureDrop.PdEndZones = HE.DeltaPendZones(Shell.HeatTransfer.Re,Baffles.Ls,Baffles.Lso,Baffles.Lsi,Properties.Hot.Inlet.Fw,Shell.HeatTransfer.Phi,Properties.Hot.Average.rho); |
|---|
| 788 | |
|---|
| 789 | |
|---|
| 790 | else |
|---|
| 791 | |
|---|
| 792 | "Shell Side Reynolds Number" |
|---|
| [45] | 793 | Shell.HeatTransfer.Re=(Dotube*Properties.Cold.Inlet.Fw/Shell.HeatTransfer.Sm)/Properties.Cold.Average.Mu; |
|---|
| [1] | 794 | |
|---|
| 795 | "Shell Heat Transfer Coefficient" |
|---|
| [45] | 796 | Shell.HeatTransfer.hshell=Shell.HeatTransfer.Ji*(Properties.Cold.Average.Cp/Properties.Cold.Average.Mw)*(Properties.Cold.Inlet.Fw/Shell.HeatTransfer.Sm)*(Shell.HeatTransfer.PR^(-2/3))*Shell.HeatTransfer.Jtotal*Shell.HeatTransfer.Phi; |
|---|
| [1] | 797 | |
|---|
| 798 | "Shell Pressure Drop Cross Flow" |
|---|
| 799 | Shell.PressureDrop.PdCross = HE.DeltaPcross(Shell.HeatTransfer.Re,Baffles.Ls,Baffles.Lso,Baffles.Lsi,Properties.Cold.Inlet.Fw,Shell.HeatTransfer.Phi,Properties.Cold.Average.rho); |
|---|
| 800 | |
|---|
| 801 | "Shell Pressure Baffle Window" |
|---|
| 802 | Shell.PressureDrop.Pdwindow = HE.DeltaPwindow(Properties.Cold.Inlet.Fw,Shell.HeatTransfer.Sm,Properties.Cold.Average.rho,Properties.Cold.Average.Mu,Baffles.Ls); |
|---|
| 803 | |
|---|
| 804 | "Shell Pressure End Zones" |
|---|
| 805 | Shell.PressureDrop.PdEndZones = HE.DeltaPendZones(Shell.HeatTransfer.Re,Baffles.Ls,Baffles.Lso,Baffles.Lsi,Properties.Cold.Inlet.Fw,Shell.HeatTransfer.Phi,Properties.Cold.Average.rho); |
|---|
| 806 | |
|---|
| 807 | |
|---|
| 808 | end |
|---|
| 809 | |
|---|
| 810 | |
|---|
| 811 | end |
|---|
| 812 | |
|---|
| 813 | Model Multipass_NTU_Det |
|---|
| [26] | 814 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| [1] | 815 | # Shell and Tubes Heat Exchanger In Series with 1 shell pass - LMTD Method |
|---|
| [26] | 816 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| [1] | 817 | PARAMETERS |
|---|
| 818 | |
|---|
| [45] | 819 | Nshell as Integer (Brief="N Shell in Series",Default=2); |
|---|
| 820 | ext PP as CalcObject (Brief="External Physical Properties"); |
|---|
| 821 | HE as CalcObject (Brief="heatex Calculations", File="heatex"); |
|---|
| 822 | side as Integer (Brief="Fluid Alocation",Lower=0,Upper=1); |
|---|
| 823 | Pi as constant (Brief="Pi Number",Default=3.14159265); |
|---|
| [1] | 824 | |
|---|
| [26] | 825 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| [1] | 826 | # Shell Geometrical Parameters |
|---|
| [26] | 827 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| [1] | 828 | Tpass as Integer (Brief="Number of Tube Passes",Lower=1); |
|---|
| 829 | Nss as Integer (Brief="Number of Sealing Strips pairs",Lower=1); |
|---|
| 830 | Dishell as length (Brief="Inside Shell Diameter",Lower=10e-6); |
|---|
| 831 | Donozzle_Shell as length (Brief="Shell Outlet Nozzle Diameter",Lower=10e-6); |
|---|
| 832 | Dinozzle_Shell as length (Brief="Shell Inlet Nozzle Diameter",Lower=10e-6); |
|---|
| 833 | Hinozzle_Shell as length (Brief="Height Under Shell Inlet Nozzle",Lower=10e-6); |
|---|
| 834 | Honozzle_Shell as length (Brief="Height Under Shell Outlet Nozzle",Lower=10e-6); |
|---|
| 835 | Lcf as length (Brief="Bundle-to-Shell Clearance",Lower=10e-8); |
|---|
| [26] | 836 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| [1] | 837 | # Tubes Geometrical Parameters |
|---|
| [26] | 838 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| [1] | 839 | Ntt as Integer (Brief="Total Number of Tubes in Shell",Default=100,Lower=1); |
|---|
| 840 | Pattern as Integer (Brief="Tube Layout Characteristic Angle",Lower=30); |
|---|
| 841 | Ltube as length (Brief="Effective Tube Length",Lower=0.1); |
|---|
| 842 | pitch as length (Brief="Tube Pitch",Lower=1e-8); |
|---|
| 843 | Kwall as conductivity (Brief="Tube Wall Material Thermal Conductivity"); |
|---|
| 844 | Dotube as length (Brief="Tube Outside Diameter",Lower=10e-6); |
|---|
| 845 | Ditube as length (Brief="Tube Inside Diameter",Lower=10e-6); |
|---|
| 846 | Donozzle_Tube as length (Brief="Tube Outlet Nozzle Diameter",Lower=10e-6); |
|---|
| 847 | Dinozzle_Tube as length (Brief="Tube Inlett Nozzle Diameter",Lower=10e-6); |
|---|
| [26] | 848 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| [1] | 849 | # Baffles Geometrical Parameters |
|---|
| [26] | 850 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| [1] | 851 | Bc as Integer (Brief="Baffle Cut",Default=25,Lower=25); |
|---|
| 852 | Nb as Real (Brief="Number of Baffles",Lower=1); |
|---|
| 853 | Lcd as length (Brief="Baffle-to-Shell Clearance",Lower=10e-8); |
|---|
| 854 | Ltd as length (Brief="Tube-to-Bafflehole Clearance",Lower=10e-8); |
|---|
| [26] | 855 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| [1] | 856 | VARIABLES |
|---|
| 857 | |
|---|
| 858 | Eft(Nshell) as positive (Brief="Effectiveness",Default=0.05,Lower=1e-8); |
|---|
| 859 | Unity(Nshell) as HeatExchangerDetailed_Basic;# "Shell in Series" |
|---|
| 860 | |
|---|
| 861 | CONNECTIONS |
|---|
| 862 | |
|---|
| 863 | Unity([1:Nshell-1]).Outlet.Hot to Unity([2:Nshell]).Inlet.Hot; |
|---|
| [45] | 864 | Unity([2:Nshell]).Outlet.Cold to Unity([1:Nshell-1]).Inlet.Cold; |
|---|
| [1] | 865 | |
|---|
| 866 | EQUATIONS |
|---|
| 867 | |
|---|
| 868 | for i in [1:Nshell] |
|---|
| 869 | |
|---|
| 870 | "Shell Side Cross Flow Area" |
|---|
| 871 | Unity(i).Shell.HeatTransfer.Sm = HE.CrossFlowArea(Unity(i).Baffles.Ls); |
|---|
| 872 | |
|---|
| 873 | "Ji Factor" |
|---|
| [45] | 874 | Unity(i).Shell.HeatTransfer.Ji =HE.JiFactor(Unity(i).Shell.HeatTransfer.Re); |
|---|
| [1] | 875 | |
|---|
| 876 | "Jc Factor" |
|---|
| 877 | Unity(i).Shell.HeatTransfer.Jc = HE.JcFactor(); |
|---|
| 878 | |
|---|
| 879 | "Jl Factor" |
|---|
| 880 | Unity(i).Shell.HeatTransfer.Jl = HE.JlFactor(Unity(i).Shell.HeatTransfer.Sm); |
|---|
| 881 | |
|---|
| 882 | "Jb Factor" |
|---|
| 883 | Unity(i).Shell.HeatTransfer.Jb = HE.JbFactor(Unity(i).Shell.HeatTransfer.Re,Unity(i).Baffles.Ls,Unity(i).Shell.HeatTransfer.Sm); |
|---|
| 884 | |
|---|
| 885 | "Jr Factor" |
|---|
| 886 | Unity(i).Shell.HeatTransfer.Jr = HE.JrFactor(Unity(i).Shell.HeatTransfer.Re); |
|---|
| 887 | |
|---|
| 888 | "Total J Factor" |
|---|
| 889 | Unity(i).Shell.HeatTransfer.Jtotal=Unity(i).Shell.HeatTransfer.Jc*Unity(i).Shell.HeatTransfer.Jl*Unity(i).Shell.HeatTransfer.Jb*Unity(i).Shell.HeatTransfer.Jr*Unity(i).Shell.HeatTransfer.Js; |
|---|
| 890 | |
|---|
| [26] | 891 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| [1] | 892 | # Fluid Alocation |
|---|
| [26] | 893 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| [1] | 894 | |
|---|
| 895 | if side equal 1 then |
|---|
| 896 | |
|---|
| 897 | "Shell Side Phi correction for viscosity" |
|---|
| 898 | Unity(i).Shell.HeatTransfer.Phi = HE.PhiCorrection(Unity(i).Properties.Hot.Average.Mu,Unity(i).Properties.Hot.Wall.Mu); |
|---|
| 899 | |
|---|
| 900 | "Tube Side Phi correction for viscosity" |
|---|
| 901 | Unity(i).Tubes.HeatTransfer.Phi = HE.PhiCorrection(Unity(i).Properties.Cold.Average.Mu,Unity(i).Properties.Cold.Wall.Mu); |
|---|
| 902 | |
|---|
| 903 | else |
|---|
| 904 | |
|---|
| 905 | "Shell Side Phi correction for viscosity" |
|---|
| 906 | Unity(i).Shell.HeatTransfer.Phi = HE.PhiCorrection(Unity(i).Properties.Cold.Average.Mu,Unity(i).Properties.Cold.Wall.Mu); |
|---|
| 907 | |
|---|
| 908 | "Tube Side Phi correction for viscosity" |
|---|
| 909 | Unity(i).Tubes.HeatTransfer.Phi = HE.PhiCorrection(Unity(i).Properties.Hot.Average.Mu,Unity(i).Properties.Hot.Average.Mu); |
|---|
| 910 | |
|---|
| 911 | end |
|---|
| 912 | |
|---|
| 913 | |
|---|
| 914 | if side equal 1 |
|---|
| 915 | |
|---|
| 916 | then |
|---|
| 917 | |
|---|
| [26] | 918 | "Hot Wall Temperature" |
|---|
| [1] | 919 | Unity(i).Properties.Hot.Wall.Twall = (Unity(i).Properties.Hot.Average.T+Unity(i).Properties.Cold.Average.T)/2; |
|---|
| [26] | 920 | |
|---|
| 921 | "Cold Wall Temperature" |
|---|
| [1] | 922 | Unity(i).Properties.Cold.Wall.Twall = (Unity(i).Properties.Hot.Average.T+Unity(i).Properties.Cold.Average.T)/2; |
|---|
| 923 | |
|---|
| 924 | "Tube Side Velocity" |
|---|
| [45] | 925 | Unity(i).Tubes.HeatTransfer.Vtube = Unity(i).Properties.Cold.Inlet.Fw*Tpass/((Pi*Ditube*Ditube/4)*Unity(i).Properties.Cold.Average.rho*Ntt); |
|---|
| [1] | 926 | |
|---|
| 927 | "Tube Side Reynolds Number" |
|---|
| [45] | 928 | Unity(i).Tubes.HeatTransfer.Re=(Unity(i).Properties.Cold.Average.rho*Unity(i).Tubes.HeatTransfer.Vtube*Ditube)/Unity(i).Properties.Cold.Average.Mu; |
|---|
| 929 | |
|---|
| [1] | 930 | "Tube Side Prandtl Number" |
|---|
| [45] | 931 | Unity(i).Tubes.HeatTransfer.PR = ((Unity(i).Properties.Cold.Average.Cp/Unity(i).Properties.Cold.Average.Mw)*Unity(i).Properties.Cold.Average.Mu)/Unity(i).Properties.Cold.Average.K; |
|---|
| [1] | 932 | |
|---|
| 933 | "Tube Side Prandtl Number at Wall Temperature" |
|---|
| [45] | 934 | Unity(i).Tubes.HeatTransfer.PRw = ((Unity(i).Properties.Cold.Wall.Cp/Unity(i).Properties.Cold.Average.Mw)*Unity(i).Properties.Cold.Wall.Mu)/Unity(i).Properties.Cold.Wall.K; |
|---|
| [1] | 935 | |
|---|
| 936 | "Tube Side Film Coefficient" |
|---|
| [45] | 937 | Unity(i).Tubes.HeatTransfer.htube= HE.TubeFilmCoeff(Unity(i).Tubes.HeatTransfer.Re,Unity(i).Tubes.HeatTransfer.PR,Unity(i).Properties.Cold.Average.K)*Unity(i).Tubes.HeatTransfer.Phi; |
|---|
| [1] | 938 | |
|---|
| 939 | "Shell Side Prandtl Number" |
|---|
| [45] | 940 | Unity(i).Shell.HeatTransfer.PR=((Unity(i).Properties.Hot.Average.Cp/Unity(i).Properties.Hot.Average.Mw)*Unity(i).Properties.Hot.Average.Mu)/Unity(i).Properties.Hot.Average.K; |
|---|
| [1] | 941 | |
|---|
| 942 | "Shell Side Prandtl Number at Wall Temperature" |
|---|
| [45] | 943 | Unity(i).Shell.HeatTransfer.PRw = ((Unity(i).Properties.Hot.Wall.Cp/Unity(i).Properties.Hot.Average.Mw)*Unity(i).Properties.Hot.Wall.Mu)/Unity(i).Properties.Hot.Wall.K; |
|---|
| [1] | 944 | |
|---|
| 945 | "Tube Side Pressure Drop" |
|---|
| 946 | Unity(i).Tubes.PressureDrop.PdTube = HE.DeltaPtube(Unity(i).Tubes.HeatTransfer.Re,Unity(i).Properties.Cold.Average.rho,Unity(i).Tubes.HeatTransfer.Vtube,Unity(i).Tubes.HeatTransfer.Phi); |
|---|
| 947 | |
|---|
| 948 | "Pressure Drop Tube Side Inlet Nozzle" |
|---|
| 949 | Unity(i).Tubes.PressureDrop.Pdnozzle_in = HE.DeltaPtubeNozzlein(Unity(i).Properties.Cold.Inlet.rho,Unity(i).Properties.Cold.Inlet.Fw); |
|---|
| 950 | |
|---|
| 951 | "Velocity Tube Side Inlet Nozzle" |
|---|
| 952 | Unity(i).Tubes.PressureDrop.Vnozzle_in = HE.TubeVelocityNozzlein(Unity(i).Properties.Cold.Inlet.rho,Unity(i).Properties.Cold.Inlet.Fw); |
|---|
| 953 | |
|---|
| 954 | "Pressure Drop Tube Side Outlet Nozzle" |
|---|
| 955 | Unity(i).Tubes.PressureDrop.Pdnozzle_out = HE.DeltaPtubeNozzleout(Unity(i).Properties.Cold.Outlet.rho,Unity(i).Properties.Cold.Inlet.Fw); |
|---|
| 956 | |
|---|
| 957 | "Velocity Tube Side Outlet Nozzle" |
|---|
| 958 | Unity(i).Tubes.PressureDrop.Vnozzle_out = HE.TubeVelocityNozzleout(Unity(i).Properties.Cold.Outlet.rho,Unity(i).Properties.Cold.Inlet.Fw); |
|---|
| 959 | |
|---|
| 960 | "Shell Pressure Drop Inlet Nozzle" |
|---|
| 961 | Unity(i).Shell.PressureDrop.Pdnozzle_in = HE.DeltaPshellNozzleIn(Unity(i).Properties.Hot.Inlet.rho,Unity(i).Properties.Hot.Inlet.Fw); |
|---|
| 962 | |
|---|
| 963 | "Velocity Shell Side Inlet Nozzle" |
|---|
| 964 | Unity(i).Shell.PressureDrop.Vnozzle_in = HE.ShellVelocityNozzleIn(Unity(i).Properties.Hot.Inlet.rho,Unity(i).Properties.Hot.Inlet.Fw); |
|---|
| 965 | |
|---|
| 966 | "Shell Pressure Drop Outlet Nozzle" |
|---|
| 967 | Unity(i).Shell.PressureDrop.Pdnozzle_out =HE.DeltaPshellNozzleOut(Unity(i).Properties.Hot.Outlet.rho,Unity(i).Properties.Hot.Inlet.Fw); |
|---|
| 968 | |
|---|
| 969 | "Velocity Shell Side Outlet Nozzle" |
|---|
| 970 | Unity(i).Shell.PressureDrop.Vnozzle_out =HE.ShellVelocityNozzleOut(Unity(i).Properties.Hot.Outlet.rho,Unity(i).Properties.Hot.Inlet.Fw); |
|---|
| 971 | |
|---|
| 972 | "Pressure Drop Hot Stream" |
|---|
| 973 | Unity(i).Outlet.Hot.P = Unity(i).Inlet.Hot.P- Unity(i).Shell.PressureDrop.Pdtotal; |
|---|
| 974 | |
|---|
| 975 | "Pressure Drop Cold Stream" |
|---|
| 976 | Unity(i).Outlet.Cold.P = Unity(i).Inlet.Cold.P - Unity(i).Tubes.PressureDrop.Pdtotal; |
|---|
| 977 | |
|---|
| 978 | |
|---|
| 979 | else |
|---|
| 980 | |
|---|
| [26] | 981 | "Hot Wall Temperature" |
|---|
| [1] | 982 | Unity(i).Properties.Hot.Wall.Twall = (Unity(i).Properties.Hot.Average.T+Unity(i).Properties.Cold.Average.T)/2; |
|---|
| [26] | 983 | |
|---|
| 984 | "Cold Wall Temperature" |
|---|
| [1] | 985 | Unity(i).Properties.Cold.Wall.Twall = (Unity(i).Properties.Hot.Average.T+Unity(i).Properties.Cold.Average.T)/2; |
|---|
| 986 | |
|---|
| 987 | "Tube Side Velocity" |
|---|
| [45] | 988 | Unity(i).Tubes.HeatTransfer.Vtube = Unity(i).Properties.Hot.Inlet.Fw*Tpass/((Pi*Ditube*Ditube/4)*Unity(i).Properties.Hot.Average.rho*Ntt); |
|---|
| [1] | 989 | |
|---|
| 990 | "Tube Side Reynolds Number" |
|---|
| [45] | 991 | Unity(i).Tubes.HeatTransfer.Re = (Unity(i).Properties.Hot.Average.rho*Unity(i).Tubes.HeatTransfer.Vtube*Ditube)/Unity(i).Properties.Hot.Average.Mu; |
|---|
| [1] | 992 | |
|---|
| 993 | "Tube Side Prandtl Number" |
|---|
| [45] | 994 | Unity(i).Tubes.HeatTransfer.PR = ((Unity(i).Properties.Hot.Average.Cp/Unity(i).Properties.Hot.Average.Mw)*Unity(i).Properties.Hot.Average.Mu)/Unity(i).Properties.Hot.Average.K; |
|---|
| [1] | 995 | |
|---|
| 996 | "Tube Side Prandtl Number at Wall" |
|---|
| [45] | 997 | Unity(i).Tubes.HeatTransfer.PRw = ((Unity(i).Properties.Hot.Wall.Cp/Unity(i).Properties.Hot.Average.Mw)*Unity(i).Properties.Hot.Wall.Mu)/Unity(i).Properties.Hot.Wall.K; |
|---|
| [1] | 998 | |
|---|
| 999 | "Tube Side Film Coefficient" |
|---|
| [45] | 1000 | Unity(i).Tubes.HeatTransfer.htube = HE.TubeFilmCoeff(Unity(i).Tubes.HeatTransfer.Re,Unity(i).Tubes.HeatTransfer.PR,Unity(i).Properties.Hot.Average.K)*Unity(i).Tubes.HeatTransfer.Phi; |
|---|
| [1] | 1001 | |
|---|
| 1002 | "Shell Side Prandtl Number" |
|---|
| [45] | 1003 | Unity(i).Shell.HeatTransfer.PR = ((Unity(i).Properties.Cold.Average.Cp/Unity(i).Properties.Cold.Average.Mw)*Unity(i).Properties.Cold.Average.Mu)/Unity(i).Properties.Cold.Average.K; |
|---|
| [1] | 1004 | |
|---|
| 1005 | "Shell Side Prandtl Number at Wall" |
|---|
| [45] | 1006 | Unity(i).Shell.HeatTransfer.PRw = ((Unity(i).Properties.Cold.Wall.Cp/Unity(i).Properties.Cold.Average.Mw)*Unity(i).Properties.Cold.Wall.Mu)/Unity(i).Properties.Cold.Wall.K; |
|---|
| [1] | 1007 | |
|---|
| 1008 | "Tube Side Pressure Drop" |
|---|
| 1009 | Unity(i).Tubes.PressureDrop.PdTube = HE.DeltaPtube(Unity(i).Tubes.HeatTransfer.Re,Unity(i).Properties.Hot.Average.rho,Unity(i).Tubes.HeatTransfer.Vtube,Unity(i).Tubes.HeatTransfer.Phi); |
|---|
| 1010 | |
|---|
| 1011 | "Pressure Drop Tube Side Inlet Nozzle" |
|---|
| 1012 | Unity(i).Tubes.PressureDrop.Pdnozzle_in = HE.DeltaPtubeNozzlein(Unity(i).Properties.Hot.Inlet.rho,Unity(i).Properties.Hot.Inlet.Fw); |
|---|
| 1013 | |
|---|
| 1014 | "Velocity Tube Side Inlet Nozzle" |
|---|
| 1015 | Unity(i).Tubes.PressureDrop.Vnozzle_in = HE.TubeVelocityNozzlein(Unity(i).Properties.Hot.Inlet.rho,Unity(i).Properties.Hot.Inlet.Fw); |
|---|
| 1016 | |
|---|
| 1017 | "Pressure Drop Tube Side Outlet Nozzle" |
|---|
| 1018 | Unity(i).Tubes.PressureDrop.Pdnozzle_out = HE.DeltaPtubeNozzleout(Unity(i).Properties.Hot.Outlet.rho,Unity(i).Properties.Hot.Inlet.Fw); |
|---|
| 1019 | |
|---|
| 1020 | "Velocity Tube Side Outlet Nozzle" |
|---|
| 1021 | Unity(i).Tubes.PressureDrop.Vnozzle_out = HE.TubeVelocityNozzleout(Unity(i).Properties.Hot.Outlet.rho,Unity(i).Properties.Hot.Inlet.Fw); |
|---|
| 1022 | |
|---|
| 1023 | "Shell Pressure Drop Inlet Nozzle" |
|---|
| 1024 | Unity(i).Shell.PressureDrop.Pdnozzle_in = HE.DeltaPshellNozzleIn(Unity(i).Properties.Cold.Inlet.rho,Unity(i).Properties.Cold.Inlet.Fw); |
|---|
| 1025 | |
|---|
| 1026 | "Velocity Shell Side Inlet Nozzle" |
|---|
| 1027 | Unity(i).Shell.PressureDrop.Vnozzle_in = HE.ShellVelocityNozzleIn(Unity(i).Properties.Cold.Inlet.rho,Unity(i).Properties.Cold.Inlet.Fw); |
|---|
| 1028 | |
|---|
| 1029 | "Shell Pressure Drop Outlet Nozzle" |
|---|
| 1030 | Unity(i).Shell.PressureDrop.Pdnozzle_out = HE.DeltaPshellNozzleOut(Unity(i).Properties.Cold.Outlet.rho,Unity(i).Properties.Cold.Inlet.Fw); |
|---|
| 1031 | |
|---|
| 1032 | "Velocity Shell Side Outlet Nozzle" |
|---|
| 1033 | Unity(i).Shell.PressureDrop.Vnozzle_out = HE.ShellVelocityNozzleOut(Unity(i).Properties.Cold.Outlet.rho,Unity(i).Properties.Cold.Inlet.Fw); |
|---|
| 1034 | |
|---|
| 1035 | "Pressure Drop Hot Stream" |
|---|
| 1036 | Unity(i).Outlet.Hot.P = Unity(i).Inlet.Hot.P- Unity(i).Tubes.PressureDrop.Pdtotal; |
|---|
| 1037 | |
|---|
| 1038 | "Pressure Drop Cold Stream" |
|---|
| 1039 | Unity(i).Outlet.Cold.P = Unity(i).Inlet.Cold.P - Unity(i).Shell.PressureDrop.Pdtotal; |
|---|
| 1040 | |
|---|
| 1041 | |
|---|
| 1042 | end |
|---|
| 1043 | |
|---|
| [26] | 1044 | if side equal 1 |
|---|
| 1045 | |
|---|
| 1046 | then |
|---|
| 1047 | |
|---|
| 1048 | "Shell Side inlet Nozzle rho-V^2" |
|---|
| 1049 | Unity(i).Shell.PressureDrop.RVsquare_in = Unity(i).Properties.Hot.Inlet.rho*(Unity(i).Shell.PressureDrop.Vnozzle_in)^2; |
|---|
| 1050 | |
|---|
| 1051 | "Shell Side Outlet Nozzle rho-V^2" |
|---|
| 1052 | Unity(i).Shell.PressureDrop.RVsquare_out = Unity(i).Properties.Hot.Outlet.rho*(Unity(i).Shell.PressureDrop.Vnozzle_out)^2; |
|---|
| 1053 | |
|---|
| 1054 | else |
|---|
| 1055 | |
|---|
| 1056 | "Shell Side inlet Nozzle rho-V^2" |
|---|
| 1057 | Unity(i).Shell.PressureDrop.RVsquare_in = Unity(i).Properties.Cold.Inlet.rho*(Unity(i).Shell.PressureDrop.Vnozzle_in)^2; |
|---|
| 1058 | |
|---|
| 1059 | "Shell Side Outlet Nozzle rho-V^2" |
|---|
| 1060 | Unity(i).Shell.PressureDrop.RVsquare_out = Unity(i).Properties.Cold.Outlet.rho*(Unity(i).Shell.PressureDrop.Vnozzle_out)^2; |
|---|
| 1061 | |
|---|
| 1062 | end |
|---|
| 1063 | |
|---|
| [1] | 1064 | "Tube Resistance" |
|---|
| 1065 | Unity(i).Resistances.Rtube*(Unity(i).Tubes.HeatTransfer.htube*Ditube) = Dotube; |
|---|
| 1066 | |
|---|
| 1067 | "Wall Resistance" |
|---|
| 1068 | Unity(i).Resistances.Rwall=Dotube*ln(Dotube/Ditube)/(2*Kwall); |
|---|
| 1069 | |
|---|
| 1070 | "Shell Resistance" |
|---|
| 1071 | Unity(i).Resistances.Rshell*(Unity(i).Shell.HeatTransfer.hshell)=1; |
|---|
| 1072 | |
|---|
| 1073 | "Overall Heat Transfer Coefficient" |
|---|
| 1074 | Unity(i).Details.U=1/(Dotube/(Unity(i).Tubes.HeatTransfer.htube*Ditube)+(Dotube*ln(Dotube/Ditube)/(2*Kwall))+(1/(Unity(i).Shell.HeatTransfer.hshell))); |
|---|
| 1075 | |
|---|
| 1076 | "Exchange Surface Area" |
|---|
| 1077 | Unity(i).Details.A=Pi*Dotube*Ntt*Ltube; |
|---|
| 1078 | |
|---|
| 1079 | "Baffles Spacing" |
|---|
| 1080 | Ltube = Unity(i).Baffles.Lsi+Unity(i).Baffles.Lso+Unity(i).Baffles.Ls*(Nb-1); |
|---|
| 1081 | |
|---|
| 1082 | "TEMA E Shell Effectiveness" |
|---|
| 1083 | Eft(i) = 2*(1+Unity(i).Details.Cr+sqrt(1+Unity(i).Details.Cr^2)*((1+exp(-Unity(i).Details.NTU*sqrt(1+Unity(i).Details.Cr^2)))/(1-exp(-Unity(i).Details.NTU*sqrt(1+Unity(i).Details.Cr^2)))) )^-1; |
|---|
| 1084 | |
|---|
| 1085 | "Js Factor" |
|---|
| 1086 | Unity(i).Shell.HeatTransfer.Js = HE.JsFactor(Unity(i).Shell.HeatTransfer.Re,Unity(i).Baffles.Lsi,Unity(i).Baffles.Lso,Unity(i).Baffles.Ls); |
|---|
| 1087 | |
|---|
| 1088 | if side equal 1 |
|---|
| 1089 | |
|---|
| 1090 | then |
|---|
| 1091 | |
|---|
| 1092 | "Shell Side Reynolds Number" |
|---|
| [45] | 1093 | Unity(i).Shell.HeatTransfer.Re=(Dotube*Unity(i).Properties.Hot.Inlet.Fw/Unity(i).Shell.HeatTransfer.Sm)/Unity(i).Properties.Hot.Average.Mu; |
|---|
| [1] | 1094 | |
|---|
| 1095 | "Shell Heat Transfer Coefficient" |
|---|
| [45] | 1096 | Unity(i).Shell.HeatTransfer.hshell=Unity(i).Shell.HeatTransfer.Ji*(Unity(i).Properties.Hot.Average.Cp/Unity(i).Properties.Hot.Average.Mw)*(Unity(i).Properties.Hot.Inlet.Fw/Unity(i).Shell.HeatTransfer.Sm)*(Unity(i).Shell.HeatTransfer.PR^(-2/3))*Unity(i).Shell.HeatTransfer.Jtotal*Unity(i).Shell.HeatTransfer.Phi; |
|---|
| [1] | 1097 | |
|---|
| 1098 | "Shell Pressure Drop Cross Flow" |
|---|
| 1099 | Unity(i).Shell.PressureDrop.PdCross = HE.DeltaPcross(Unity(i).Shell.HeatTransfer.Re,Unity(i).Baffles.Ls,Unity(i).Baffles.Lso,Unity(i).Baffles.Lsi,Unity(i).Properties.Hot.Inlet.Fw,Unity(i).Shell.HeatTransfer.Phi,Unity(i).Properties.Hot.Average.rho); |
|---|
| 1100 | |
|---|
| 1101 | "Shell Pressure Baffle Window" |
|---|
| 1102 | Unity(i).Shell.PressureDrop.Pdwindow = HE.DeltaPwindow(Unity(i).Properties.Hot.Inlet.Fw,Unity(i).Shell.HeatTransfer.Sm,Unity(i).Properties.Hot.Average.rho,Unity(i).Properties.Hot.Average.Mu,Unity(i).Baffles.Ls); |
|---|
| 1103 | |
|---|
| 1104 | "Shell Pressure End Zones" |
|---|
| 1105 | Unity(i).Shell.PressureDrop.PdEndZones = HE.DeltaPendZones(Unity(i).Shell.HeatTransfer.Re,Unity(i).Baffles.Ls,Unity(i).Baffles.Lso,Unity(i).Baffles.Lsi,Unity(i).Properties.Hot.Inlet.Fw,Unity(i).Shell.HeatTransfer.Phi,Unity(i).Properties.Hot.Average.rho); |
|---|
| 1106 | |
|---|
| 1107 | |
|---|
| 1108 | else |
|---|
| 1109 | |
|---|
| 1110 | "Shell Side Reynolds Number" |
|---|
| [45] | 1111 | Unity(i).Shell.HeatTransfer.Re=(Dotube*Unity(i).Properties.Cold.Inlet.Fw/Unity(i).Shell.HeatTransfer.Sm)/Unity(i).Properties.Cold.Average.Mu; |
|---|
| [1] | 1112 | |
|---|
| 1113 | "Shell Heat Transfer Coefficient" |
|---|
| [45] | 1114 | Unity(i).Shell.HeatTransfer.hshell=Unity(i).Shell.HeatTransfer.Ji*(Unity(i).Properties.Cold.Average.Cp/Unity(i).Properties.Cold.Average.Mw)*(Unity(i).Properties.Cold.Inlet.Fw/Unity(i).Shell.HeatTransfer.Sm)*(Unity(i).Shell.HeatTransfer.PR^(-2/3))*Unity(i).Shell.HeatTransfer.Jtotal*Unity(i).Shell.HeatTransfer.Phi; |
|---|
| [1] | 1115 | |
|---|
| 1116 | "Shell Pressure Drop Cross Flow" |
|---|
| 1117 | Unity(i).Shell.PressureDrop.PdCross = HE.DeltaPcross(Unity(i).Shell.HeatTransfer.Re,Unity(i).Baffles.Ls,Unity(i).Baffles.Lso,Unity(i).Baffles.Lsi,Unity(i).Properties.Cold.Inlet.Fw,Unity(i).Shell.HeatTransfer.Phi,Unity(i).Properties.Cold.Average.rho); |
|---|
| 1118 | |
|---|
| 1119 | "Shell Pressure Baffle Window" |
|---|
| 1120 | Unity(i).Shell.PressureDrop.Pdwindow = HE.DeltaPwindow(Unity(i).Properties.Cold.Inlet.Fw,Unity(i).Shell.HeatTransfer.Sm,Unity(i).Properties.Cold.Average.rho,Unity(i).Properties.Cold.Average.Mu,Unity(i).Baffles.Ls); |
|---|
| 1121 | |
|---|
| 1122 | "Shell Pressure End Zones" |
|---|
| 1123 | Unity(i).Shell.PressureDrop.PdEndZones = HE.DeltaPendZones(Unity(i).Shell.HeatTransfer.Re,Unity(i).Baffles.Ls,Unity(i).Baffles.Lso,Unity(i).Baffles.Lsi,Unity(i).Properties.Cold.Inlet.Fw,Unity(i).Shell.HeatTransfer.Phi,Unity(i).Properties.Cold.Average.rho); |
|---|
| 1124 | |
|---|
| 1125 | |
|---|
| 1126 | end |
|---|
| 1127 | |
|---|
| [26] | 1128 | "Duty" |
|---|
| [1] | 1129 | Unity(i).Details.Q = Eft(i)*Unity(i).Details.Cmin*(Unity(i).Inlet.Hot.T-Unity(i).Inlet.Cold.T); |
|---|
| 1130 | |
|---|
| 1131 | end |
|---|
| 1132 | |
|---|
| 1133 | SET |
|---|
| [26] | 1134 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| [1] | 1135 | # Set Parameters for heatex Calculation |
|---|
| [26] | 1136 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| [1] | 1137 | Pi = 3.14159265; |
|---|
| 1138 | HE.Tpass = Tpass; |
|---|
| 1139 | HE.Nss = Nss; |
|---|
| 1140 | HE.Ntt = Ntt; |
|---|
| 1141 | HE.Pattern = Pattern; |
|---|
| 1142 | HE.Bc = Bc; |
|---|
| 1143 | HE.Donozzle_Shell = Donozzle_Shell; |
|---|
| 1144 | HE.Dinozzle_Shell = Dinozzle_Shell; |
|---|
| 1145 | HE.Honozzle_Shell = Honozzle_Shell; |
|---|
| 1146 | HE.Hinozzle_Shell = Hinozzle_Shell; |
|---|
| 1147 | HE.Donozzle_Tube = Donozzle_Tube; |
|---|
| 1148 | HE.Dinozzle_Tube = Dinozzle_Tube; |
|---|
| 1149 | HE.Nb = Nb; |
|---|
| 1150 | HE.Dishell = Dishell; |
|---|
| 1151 | HE.Lcf = Lcf; |
|---|
| 1152 | HE.Ltube = Ltube; |
|---|
| 1153 | HE.pitch = pitch; |
|---|
| 1154 | HE.Dotube = Dotube; |
|---|
| 1155 | HE.Ditube = Ditube; |
|---|
| 1156 | HE.Lcd = Lcd; |
|---|
| 1157 | HE.Ltd = Ltd; |
|---|
| 1158 | side = HE.FluidAlocation(); |
|---|
| 1159 | |
|---|
| 1160 | end |
|---|
| 1161 | |
|---|
| 1162 | Model E_Shell_LMTD_Det as Heatex_Detailed_LMTD |
|---|
| [26] | 1163 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| [1] | 1164 | # Shell and Tubes Heat Exchanger with 1 shell pass - LMTD Method |
|---|
| [26] | 1165 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| [1] | 1166 | EQUATIONS |
|---|
| 1167 | |
|---|
| 1168 | "LMTD Correction Factor" |
|---|
| 1169 | Fc = HE.EshellCorrectionFactor(Inlet.Hot.T,Outlet.Hot.T,Inlet.Cold.T,Outlet.Cold.T); |
|---|
| 1170 | |
|---|
| [45] | 1171 | "Temperature Difference at Inlet" |
|---|
| 1172 | DT0 = Inlet.Hot.T - Outlet.Cold.T; |
|---|
| [1] | 1173 | |
|---|
| [45] | 1174 | "Temperature Difference at Outlet" |
|---|
| 1175 | DTL = Outlet.Hot.T - Inlet.Cold.T; |
|---|
| 1176 | |
|---|
| [1] | 1177 | "Js Factor" |
|---|
| 1178 | Shell.HeatTransfer.Js = HE.JsFactor(Shell.HeatTransfer.Re,Baffles.Lsi,Baffles.Lso,Baffles.Ls); |
|---|
| 1179 | |
|---|
| 1180 | if side equal 1 |
|---|
| 1181 | |
|---|
| 1182 | then |
|---|
| 1183 | |
|---|
| 1184 | "Shell Side Reynolds Number" |
|---|
| [45] | 1185 | Shell.HeatTransfer.Re=(Dotube*Properties.Hot.Inlet.Fw/Shell.HeatTransfer.Sm)/Properties.Hot.Average.Mu; |
|---|
| [1] | 1186 | |
|---|
| 1187 | "Shell Heat Transfer Coefficient" |
|---|
| [45] | 1188 | Shell.HeatTransfer.hshell=Shell.HeatTransfer.Ji*(Properties.Hot.Average.Cp/Properties.Hot.Average.Mw)*(Properties.Hot.Inlet.Fw/Shell.HeatTransfer.Sm)*(Shell.HeatTransfer.PR^(-2/3))*Shell.HeatTransfer.Jtotal*Shell.HeatTransfer.Phi; |
|---|
| [1] | 1189 | |
|---|
| 1190 | "Shell Pressure Drop Cross Flow" |
|---|
| 1191 | Shell.PressureDrop.PdCross = HE.DeltaPcross(Shell.HeatTransfer.Re,Baffles.Ls,Baffles.Lso,Baffles.Lsi,Properties.Hot.Inlet.Fw,Shell.HeatTransfer.Phi,Properties.Hot.Average.rho); |
|---|
| 1192 | |
|---|
| 1193 | "Shell Pressure Baffle Window" |
|---|
| 1194 | Shell.PressureDrop.Pdwindow = HE.DeltaPwindow(Properties.Hot.Inlet.Fw,Shell.HeatTransfer.Sm,Properties.Hot.Average.rho,Properties.Hot.Average.Mu,Baffles.Ls); |
|---|
| 1195 | |
|---|
| 1196 | "Shell Pressure End Zones" |
|---|
| 1197 | Shell.PressureDrop.PdEndZones = HE.DeltaPendZones(Shell.HeatTransfer.Re,Baffles.Ls,Baffles.Lso,Baffles.Lsi,Properties.Hot.Inlet.Fw,Shell.HeatTransfer.Phi,Properties.Hot.Average.rho); |
|---|
| 1198 | |
|---|
| 1199 | |
|---|
| 1200 | else |
|---|
| 1201 | |
|---|
| 1202 | "Shell Side Reynolds Number" |
|---|
| [45] | 1203 | Shell.HeatTransfer.Re=(Dotube*Properties.Cold.Inlet.Fw/Shell.HeatTransfer.Sm)/Properties.Cold.Average.Mu; |
|---|
| [1] | 1204 | |
|---|
| 1205 | "Shell Heat Transfer Coefficient" |
|---|
| [45] | 1206 | Shell.HeatTransfer.hshell=Shell.HeatTransfer.Ji*(Properties.Cold.Average.Cp/Properties.Cold.Average.Mw)*(Properties.Cold.Inlet.Fw/Shell.HeatTransfer.Sm)*(Shell.HeatTransfer.PR^(-2/3))*Shell.HeatTransfer.Jtotal*Shell.HeatTransfer.Phi; |
|---|
| [1] | 1207 | |
|---|
| 1208 | "Shell Pressure Drop Cross Flow" |
|---|
| 1209 | Shell.PressureDrop.PdCross = HE.DeltaPcross(Shell.HeatTransfer.Re,Baffles.Ls,Baffles.Lso,Baffles.Lsi,Properties.Cold.Inlet.Fw,Shell.HeatTransfer.Phi,Properties.Cold.Average.rho); |
|---|
| 1210 | |
|---|
| 1211 | "Shell Pressure Baffle Window" |
|---|
| 1212 | Shell.PressureDrop.Pdwindow = HE.DeltaPwindow(Properties.Cold.Inlet.Fw,Shell.HeatTransfer.Sm,Properties.Cold.Average.rho,Properties.Cold.Average.Mu,Baffles.Ls); |
|---|
| 1213 | |
|---|
| 1214 | "Shell Pressure End Zones" |
|---|
| 1215 | Shell.PressureDrop.PdEndZones = HE.DeltaPendZones(Shell.HeatTransfer.Re,Baffles.Ls,Baffles.Lso,Baffles.Lsi,Properties.Cold.Inlet.Fw,Shell.HeatTransfer.Phi,Properties.Cold.Average.rho); |
|---|
| 1216 | |
|---|
| 1217 | |
|---|
| 1218 | end |
|---|
| 1219 | |
|---|
| 1220 | |
|---|
| 1221 | |
|---|
| 1222 | end |
|---|
| 1223 | |
|---|
| 1224 | Model F_Shell_LMTD_Det as Heatex_Detailed_LMTD |
|---|
| [26] | 1225 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| [1] | 1226 | # Shell and Tubes Heat Exchanger with 2 shell pass - LMTD Method |
|---|
| [26] | 1227 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| [1] | 1228 | |
|---|
| 1229 | EQUATIONS |
|---|
| 1230 | |
|---|
| 1231 | "LMTD Correction Factor" |
|---|
| 1232 | Fc = HE.FshellCorrectionFactor(Inlet.Hot.T,Outlet.Hot.T,Inlet.Cold.T,Outlet.Cold.T); |
|---|
| 1233 | |
|---|
| [45] | 1234 | "Temperature Difference at Inlet" |
|---|
| 1235 | DT0 = Inlet.Hot.T - Outlet.Cold.T; |
|---|
| [1] | 1236 | |
|---|
| [45] | 1237 | "Temperature Difference at Outlet" |
|---|
| 1238 | DTL = Outlet.Hot.T - Inlet.Cold.T; |
|---|
| 1239 | |
|---|
| [1] | 1240 | "Js Factor" |
|---|
| 1241 | Shell.HeatTransfer.Js = HE.JsFactor(Shell.HeatTransfer.Re,Baffles.Lsi,Baffles.Lso,Baffles.Ls); |
|---|
| 1242 | |
|---|
| 1243 | if side equal 1 |
|---|
| 1244 | |
|---|
| 1245 | then |
|---|
| 1246 | |
|---|
| 1247 | "Shell Side Reynolds Number" |
|---|
| [45] | 1248 | Shell.HeatTransfer.Re=(Dotube*Properties.Hot.Inlet.Fw/Shell.HeatTransfer.Sm)/Properties.Hot.Average.Mu; |
|---|
| [1] | 1249 | |
|---|
| 1250 | "Shell Heat Transfer Coefficient" |
|---|
| [45] | 1251 | Shell.HeatTransfer.hshell=Shell.HeatTransfer.Ji*(Properties.Hot.Average.Cp/Properties.Hot.Average.Mw)*(Properties.Hot.Inlet.Fw/Shell.HeatTransfer.Sm)*(Shell.HeatTransfer.PR^(-2/3))*Shell.HeatTransfer.Jtotal*Shell.HeatTransfer.Phi; |
|---|
| [1] | 1252 | |
|---|
| 1253 | "Shell Pressure Drop Cross Flow" |
|---|
| 1254 | Shell.PressureDrop.PdCross = HE.DeltaPcross(Shell.HeatTransfer.Re,Baffles.Ls,Baffles.Lso,Baffles.Lsi,Properties.Hot.Inlet.Fw,Shell.HeatTransfer.Phi,Properties.Hot.Average.rho); |
|---|
| 1255 | |
|---|
| 1256 | "Shell Pressure Baffle Window" |
|---|
| 1257 | Shell.PressureDrop.Pdwindow = HE.DeltaPwindow(Properties.Hot.Inlet.Fw,Shell.HeatTransfer.Sm,Properties.Hot.Average.rho,Properties.Hot.Average.Mu,Baffles.Ls); |
|---|
| 1258 | |
|---|
| 1259 | "Shell Pressure End Zones" |
|---|
| 1260 | Shell.PressureDrop.PdEndZones = HE.DeltaPendZones(Shell.HeatTransfer.Re,Baffles.Ls,Baffles.Lso,Baffles.Lsi,Properties.Hot.Inlet.Fw,Shell.HeatTransfer.Phi,Properties.Hot.Average.rho); |
|---|
| 1261 | |
|---|
| 1262 | |
|---|
| 1263 | else |
|---|
| 1264 | |
|---|
| 1265 | "Shell Side Reynolds Number" |
|---|
| [45] | 1266 | Shell.HeatTransfer.Re=(Dotube*Properties.Cold.Inlet.Fw/Shell.HeatTransfer.Sm)/Properties.Cold.Average.Mu; |
|---|
| [1] | 1267 | |
|---|
| 1268 | "Shell Heat Transfer Coefficient" |
|---|
| [45] | 1269 | Shell.HeatTransfer.hshell=Shell.HeatTransfer.Ji*(Properties.Cold.Average.Cp/Properties.Cold.Average.Mw)*(Properties.Cold.Inlet.Fw/Shell.HeatTransfer.Sm)*(Shell.HeatTransfer.PR^(-2/3))*Shell.HeatTransfer.Jtotal*Shell.HeatTransfer.Phi; |
|---|
| [1] | 1270 | |
|---|
| 1271 | "Shell Pressure Drop Cross Flow" |
|---|
| 1272 | Shell.PressureDrop.PdCross = HE.DeltaPcross(Shell.HeatTransfer.Re,Baffles.Ls,Baffles.Lso,Baffles.Lsi,Properties.Cold.Inlet.Fw,Shell.HeatTransfer.Phi,Properties.Cold.Average.rho); |
|---|
| 1273 | |
|---|
| 1274 | "Shell Pressure Baffle Window" |
|---|
| 1275 | Shell.PressureDrop.Pdwindow = HE.DeltaPwindow(Properties.Cold.Inlet.Fw,Shell.HeatTransfer.Sm,Properties.Cold.Average.rho,Properties.Cold.Average.Mu,Baffles.Ls); |
|---|
| 1276 | |
|---|
| 1277 | "Shell Pressure End Zones" |
|---|
| 1278 | Shell.PressureDrop.PdEndZones = HE.DeltaPendZones(Shell.HeatTransfer.Re,Baffles.Ls,Baffles.Lso,Baffles.Lsi,Properties.Cold.Inlet.Fw,Shell.HeatTransfer.Phi,Properties.Cold.Average.rho); |
|---|
| 1279 | |
|---|
| 1280 | |
|---|
| 1281 | end |
|---|
| 1282 | |
|---|
| 1283 | end |
|---|
| 1284 | |
|---|
| 1285 | Model Multipass_LMTD_Det |
|---|
| [26] | 1286 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| [1] | 1287 | # Shell and Tubes Heat Exchanger In Series with 1 shell pass - LMTD Method |
|---|
| [26] | 1288 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| [1] | 1289 | PARAMETERS |
|---|
| 1290 | |
|---|
| [26] | 1291 | Nshell as Integer (Brief="N Shell in Series",Default=2); |
|---|
| [45] | 1292 | HE as CalcObject (Brief="STHE Calculations",File="heatex"); |
|---|
| [26] | 1293 | ext PP as CalcObject (Brief="External Physical Properties"); |
|---|
| [1] | 1294 | side as Integer (Brief="Fluid Alocation",Lower=0,Upper=1); |
|---|
| 1295 | Pi as constant (Brief="Pi Number",Default=3.14159265); |
|---|
| 1296 | |
|---|
| [26] | 1297 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| [1] | 1298 | # Shell Geometrical Parameters |
|---|
| [26] | 1299 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| [1] | 1300 | Tpass as Integer (Brief="Number of Tube Passes",Lower=1); |
|---|
| 1301 | Nss as Integer (Brief="Number of Sealing Strips pairs",Lower=1); |
|---|
| 1302 | Dishell as length (Brief="Inside Shell Diameter",Lower=10e-6); |
|---|
| 1303 | Donozzle_Shell as length (Brief="Shell Outlet Nozzle Diameter",Lower=10e-6); |
|---|
| 1304 | Dinozzle_Shell as length (Brief="Shell Inlet Nozzle Diameter",Lower=10e-6); |
|---|
| 1305 | Hinozzle_Shell as length (Brief="Height Under Shell Inlet Nozzle",Lower=10e-6); |
|---|
| 1306 | Honozzle_Shell as length (Brief="Height Under Shell Outlet Nozzle",Lower=10e-6); |
|---|
| 1307 | Lcf as length (Brief="Bundle-to-Shell Clearance",Lower=10e-8); |
|---|
| [26] | 1308 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| [1] | 1309 | # Tubes Geometrical Parameters |
|---|
| [26] | 1310 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| [1] | 1311 | Ntt as Integer (Brief="Total Number of Tubes in Shell",Default=100,Lower=1); |
|---|
| 1312 | Pattern as Integer (Brief="Tube Layout Characteristic Angle",Lower=30); |
|---|
| 1313 | Ltube as length (Brief="Effective Tube Length",Lower=0.1); |
|---|
| 1314 | pitch as length (Brief="Tube Pitch",Lower=1e-8); |
|---|
| 1315 | Kwall as conductivity (Brief="Tube Wall Material Thermal Conductivity"); |
|---|
| 1316 | Dotube as length (Brief="Tube Outside Diameter",Lower=10e-6); |
|---|
| 1317 | Ditube as length (Brief="Tube Inside Diameter",Lower=10e-6); |
|---|
| 1318 | Donozzle_Tube as length (Brief="Tube Outlet Nozzle Diameter",Lower=10e-6); |
|---|
| 1319 | Dinozzle_Tube as length (Brief="Tube Inlett Nozzle Diameter",Lower=10e-6); |
|---|
| [26] | 1320 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| [1] | 1321 | # Baffles Geometrical Parameters |
|---|
| [26] | 1322 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| [1] | 1323 | Bc as Integer (Brief="Baffle Cut",Default=25,Lower=25); |
|---|
| 1324 | Nb as Real (Brief="Number of Baffles",Lower=1); |
|---|
| 1325 | Lcd as length (Brief="Baffle-to-Shell Clearance",Lower=10e-8); |
|---|
| 1326 | Ltd as length (Brief="Tube-to-Bafflehole Clearance",Lower=10e-8); |
|---|
| [26] | 1327 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| [1] | 1328 | VARIABLES |
|---|
| 1329 | |
|---|
| [68] | 1330 | LMTD(Nshell) as temp_delta (Brief="Logarithmic Mean Temperature Difference",Lower=5); |
|---|
| 1331 | Fc(Nshell) as positive (Brief="LMTD Correction Factor",Lower=0.5); |
|---|
| 1332 | MTD(Nshell) as temp_delta (Brief="Mean Temperature Difference",Lower=5); |
|---|
| [26] | 1333 | Unity(Nshell) as HeatExchangerDetailed_Basic; |
|---|
| [1] | 1334 | |
|---|
| 1335 | CONNECTIONS |
|---|
| 1336 | |
|---|
| 1337 | Unity([1:Nshell-1]).Outlet.Hot to Unity([2:Nshell]).Inlet.Hot; |
|---|
| 1338 | Unity([2:Nshell]).Outlet.Cold to Unity([1:Nshell-1]).Inlet.Cold; |
|---|
| 1339 | |
|---|
| 1340 | EQUATIONS |
|---|
| 1341 | |
|---|
| 1342 | for i in [1:Nshell] |
|---|
| 1343 | |
|---|
| 1344 | "Shell Side Cross Flow Area" |
|---|
| 1345 | Unity(i).Shell.HeatTransfer.Sm = HE.CrossFlowArea(Unity(i).Baffles.Ls); |
|---|
| 1346 | |
|---|
| 1347 | "Ji Factor" |
|---|
| 1348 | Unity(i).Shell.HeatTransfer.Ji = HE.JiFactor(Unity(i).Shell.HeatTransfer.Re); |
|---|
| 1349 | |
|---|
| 1350 | "Jc Factor" |
|---|
| 1351 | Unity(i).Shell.HeatTransfer.Jc = HE.JcFactor(); |
|---|
| 1352 | |
|---|
| 1353 | "Jl Factor" |
|---|
| 1354 | Unity(i).Shell.HeatTransfer.Jl = HE.JlFactor(Unity(i).Shell.HeatTransfer.Sm); |
|---|
| 1355 | |
|---|
| 1356 | "Jb Factor" |
|---|
| 1357 | Unity(i).Shell.HeatTransfer.Jb = HE.JbFactor(Unity(i).Shell.HeatTransfer.Re,Unity(i).Baffles.Ls,Unity(i).Shell.HeatTransfer.Sm); |
|---|
| 1358 | |
|---|
| 1359 | "Jr Factor" |
|---|
| 1360 | Unity(i).Shell.HeatTransfer.Jr = HE.JrFactor(Unity(i).Shell.HeatTransfer.Re); |
|---|
| 1361 | |
|---|
| 1362 | "Total J Factor" |
|---|
| 1363 | Unity(i).Shell.HeatTransfer.Jtotal=Unity(i).Shell.HeatTransfer.Jc*Unity(i).Shell.HeatTransfer.Jl*Unity(i).Shell.HeatTransfer.Jb*Unity(i).Shell.HeatTransfer.Jr*Unity(i).Shell.HeatTransfer.Js; |
|---|
| 1364 | |
|---|
| [26] | 1365 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| [1] | 1366 | # Fluid Alocation |
|---|
| [26] | 1367 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
|---|
| [1] | 1368 | |
|---|
| 1369 | if side equal 1 then |
|---|
| 1370 | |
|---|
| 1371 | |
|---|
| 1372 | "Shell Side Phi correction for viscosity" |
|---|
| 1373 | Unity(i).Shell.HeatTransfer.Phi = HE.PhiCorrection(Unity(i).Properties.Hot.Average.Mu,Unity(i).Properties.Hot.Wall.Mu); |
|---|
| 1374 | |
|---|
| 1375 | "Tube Side Phi correction for viscosity" |
|---|
| 1376 | Unity(i).Tubes.HeatTransfer.Phi = HE.PhiCorrection(Unity(i).Properties.Cold.Average.Mu,Unity(i).Properties.Cold.Wall.Mu); |
|---|
| 1377 | |
|---|
| 1378 | else |
|---|
| 1379 | |
|---|
| 1380 | |
|---|
| 1381 | "Shell Side Phi correction for viscosity" |
|---|
| 1382 | Unity(i).Shell.HeatTransfer.Phi = HE.PhiCorrection(Unity(i).Properties.Cold.Average.Mu,Unity(i).Properties.Cold.Wall.Mu); |
|---|
| 1383 | |
|---|
| 1384 | "Tube Side Phi correction for viscosity" |
|---|
| 1385 | Unity(i).Tubes.HeatTransfer.Phi = HE.PhiCorrection(Unity(i).Properties.Hot.Average.Mu,Unity(i).Properties.Hot.Wall.Mu); |
|---|
| 1386 | |
|---|
| 1387 | end |
|---|
| 1388 | |
|---|
| 1389 | |
|---|
| 1390 | if side equal 1 |
|---|
| 1391 | |
|---|
| 1392 | then |
|---|
| 1393 | |
|---|
| [26] | 1394 | "Cold Wall Temperature" |
|---|
| 1395 | Unity(i).Properties.Cold.Wall.Twall = (Unity(i).Properties.Hot.Average.T+Unity(i).Properties.Cold.Average.T)/2; |
|---|
| [1] | 1396 | |
|---|
| [26] | 1397 | "Hot Wall Temperature" |
|---|
| [1] | 1398 | Unity(i).Properties.Hot.Wall.Twall = (Unity(i).Properties.Hot.Average.T+Unity(i).Properties.Cold.Average.T)/2; |
|---|
| 1399 | |
|---|
| 1400 | "Tube Side Velocity" |
|---|
| [45] | 1401 | Unity(i).Tubes.HeatTransfer.Vtube = Unity(i).Properties.Cold.Inlet.Fw*Tpass/((Pi*Ditube*Ditube/4)*Unity(i).Properties.Cold.Average.rho*Ntt); |
|---|
| [1] | 1402 | |
|---|
| 1403 | "Tube Side Reynolds Number" |
|---|
| [45] | 1404 | Unity(i).Tubes.HeatTransfer.Re=(Unity(i).Properties.Cold.Average.rho*Unity(i).Tubes.HeatTransfer.Vtube*Ditube)/Unity(i).Properties.Cold.Average.Mu; |
|---|
| 1405 | |
|---|
| [1] | 1406 | "Tube Side Prandtl Number" |
|---|
| [45] | 1407 | Unity(i).Tubes.HeatTransfer.PR = ((Unity(i).Properties.Cold.Average.Cp/Unity(i).Properties.Cold.Average.Mw)*Unity(i).Properties.Cold.Average.Mu)/Unity(i).Properties.Cold.Average.K; |
|---|
| [1] | 1408 | |
|---|
| 1409 | "Tube Side Prandtl Number at Wall" |
|---|
| [45] | 1410 | Unity(i).Tubes.HeatTransfer.PRw = ((Unity(i).Properties.Cold.Wall.Cp/Unity(i).Properties.Cold.Average.Mw)*Unity(i).Properties.Cold.Wall.Mu)/Unity(i).Properties.Cold.Wall.K; |
|---|
| [1] | 1411 | |
|---|
| 1412 | "Tube Side Film Coefficient" |
|---|
| [45] | 1413 | Unity(i).Tubes.HeatTransfer.htube= HE.TubeFilmCoeff(Unity(i).Tubes.HeatTransfer.Re,Unity(i).Tubes.HeatTransfer.PR,Unity(i).Properties.Cold.Average.K)*Unity(i).Tubes.HeatTransfer.Phi; |
|---|
| [1] | 1414 | |
|---|
| 1415 | "Shell Side Prandtl Number" |
|---|
| [45] | 1416 | Unity(i).Shell.HeatTransfer.PR=((Unity(i).Properties.Hot.Average.Cp/Unity(i).Properties.Hot.Average.Mw)*Unity(i).Properties.Hot.Average.Mu)/Unity(i).Properties.Hot.Average.K; |
|---|
| [1] | 1417 | |
|---|
| 1418 | "Shell Side Prandtl Number at Wall" |
|---|
| [45] | 1419 | Unity(i).Shell.HeatTransfer.PRw=((Unity(i).Properties.Hot.Wall.Cp/Unity(i).Properties.Hot.Average.Mw)*Unity(i).Properties.Hot.Wall.Mu)/Unity(i).Properties.Hot.Wall.K; |
|---|
| [1] | 1420 | |
|---|
| 1421 | "Tube Side Pressure Drop" |
|---|
| 1422 | Unity(i).Tubes.PressureDrop.PdTube = HE.DeltaPtube(Unity(i).Tubes.HeatTransfer.Re,Unity(i).Properties.Cold.Average.rho,Unity(i).Tubes.HeatTransfer.Vtube,Unity(i).Tubes.HeatTransfer.Phi); |
|---|
| 1423 | |
|---|
| 1424 | "Pressure Drop Tube Side Inlet Nozzle" |
|---|
| 1425 | Unity(i).Tubes.PressureDrop.Pdnozzle_in = HE.DeltaPtubeNozzlein(Unity(i).Properties.Cold.Inlet.rho,Unity(i).Properties.Cold.Inlet.Fw); |
|---|
| 1426 | |
|---|
| 1427 | "Velocity Tube Side Inlet Nozzle" |
|---|
| 1428 | Unity(i).Tubes.PressureDrop.Vnozzle_in = HE.TubeVelocityNozzlein(Unity(i).Properties.Cold.Inlet.rho,Unity(i).Properties.Cold.Inlet.Fw); |
|---|
| 1429 | |
|---|
| 1430 | "Pressure Drop Tube Side Outlet Nozzle" |
|---|
| 1431 | Unity(i).Tubes.PressureDrop.Pdnozzle_out = HE.DeltaPtubeNozzleout(Unity(i).Properties.Cold.Outlet.rho,Unity(i).Properties.Cold.Inlet.Fw); |
|---|
| 1432 | |
|---|
| 1433 | "Velocity Tube Side Outlet Nozzle" |
|---|
| 1434 | Unity(i).Tubes.PressureDrop.Vnozzle_out = HE.TubeVelocityNozzleout(Unity(i).Properties.Cold.Outlet.rho,Unity(i).Properties.Cold.Inlet.Fw); |
|---|
| 1435 | |
|---|
| 1436 | "Shell Pressure Drop Inlet Nozzle" |
|---|
| 1437 | Unity(i).Shell.PressureDrop.Pdnozzle_in = HE.DeltaPshellNozzleIn(Unity(i).Properties.Hot.Inlet.rho,Unity(i).Properties.Hot.Inlet.Fw); |
|---|
| 1438 | |
|---|
| 1439 | "Velocity Shell Side Inlet Nozzle" |
|---|
| 1440 | Unity(i).Shell.PressureDrop.Vnozzle_in = HE.ShellVelocityNozzleIn(Unity(i).Properties.Hot.Inlet.rho,Unity(i).Properties.Hot.Inlet.Fw); |
|---|
| 1441 | |
|---|
| 1442 | "Shell Pressure Drop Outlet Nozzle" |
|---|
| 1443 | Unity(i).Shell.PressureDrop.Pdnozzle_out =HE.DeltaPshellNozzleOut(Unity(i).Properties.Hot.Outlet.rho,Unity(i).Properties.Hot.Inlet.Fw); |
|---|
| 1444 | |
|---|
| 1445 | "Velocity Shell Side Outlet Nozzle" |
|---|
| 1446 | Unity(i).Shell.PressureDrop.Vnozzle_out =HE.ShellVelocityNozzleOut(Unity(i).Properties.Hot.Outlet.rho,Unity(i).Properties.Hot.Inlet.Fw); |
|---|
| 1447 | |
|---|
| 1448 | "Pressure Drop Hot Stream" |
|---|
| 1449 | Unity(i).Outlet.Hot.P = Unity(i).Inlet.Hot.P- Unity(i).Shell.PressureDrop.Pdtotal; |
|---|
| 1450 | |
|---|
| 1451 | "Pressure Drop Cold Stream" |
|---|
| 1452 | Unity(i).Outlet.Cold.P = Unity(i).Inlet.Cold.P - Unity(i).Tubes.PressureDrop.Pdtotal; |
|---|
| 1453 | |
|---|
| 1454 | |
|---|
| 1455 | else |
|---|
| 1456 | |
|---|
| [26] | 1457 | "Cold Wall Temperature" |
|---|
| 1458 | Unity(i).Properties.Cold.Wall.Twall = (Unity(i).Properties.Hot.Average.T+Unity(i).Properties.Cold.Average.T)/2; |
|---|
| [1] | 1459 | |
|---|
| [26] | 1460 | "Hot Wall Temperature" |
|---|
| [1] | 1461 | Unity(i).Properties.Hot.Wall.Twall = (Unity(i).Properties.Hot.Average.T+Unity(i).Properties.Cold.Average.T)/2; |
|---|
| 1462 | |
|---|
| 1463 | "Tube Side Velocity" |
|---|
| [45] | 1464 | Unity(i).Tubes.HeatTransfer.Vtube = Unity(i).Properties.Hot.Inlet.Fw*Tpass/((Pi*Ditube*Ditube/4)*Unity(i).Properties.Hot.Average.rho*Ntt); |
|---|
| [1] | 1465 | |
|---|
| 1466 | "Tube Side Reynolds Number" |
|---|
| [45] | 1467 | Unity(i).Tubes.HeatTransfer.Re=(Unity(i).Properties.Hot.Average.rho*Unity(i).Tubes.HeatTransfer.Vtube*Ditube)/Unity(i).Properties.Hot.Average.Mu; |
|---|
| [1] | 1468 | |
|---|
| 1469 | "Tube Side Prandtl Number" |
|---|
| [45] | 1470 | Unity(i).Tubes.HeatTransfer.PR=((Unity(i).Properties.Hot.Average.Cp/Unity(i).Properties.Hot.Average.Mw)*Unity(i).Properties.Hot.Average.Mu)/Unity(i).Properties.Hot.Average.K; |
|---|
| [1] | 1471 | |
|---|
| 1472 | "Tube Side Prandtl Number at Wall" |
|---|
| [45] | 1473 | Unity(i).Tubes.HeatTransfer.PRw=((Unity(i).Properties.Hot.Wall.Cp/Unity(i).Properties.Hot.Average.Mw)*Unity(i).Properties.Hot.Wall.Mu)/Unity(i).Properties.Hot.Wall.K; |
|---|
| [1] | 1474 | |
|---|
| 1475 | "Tube Side Film Coefficient" |
|---|
| [45] | 1476 | Unity(i).Tubes.HeatTransfer.htube= HE.TubeFilmCoeff(Unity(i).Tubes.HeatTransfer.Re,Unity(i).Tubes.HeatTransfer.PR,Unity(i).Properties.Hot.Average.K)*Unity(i).Tubes.HeatTransfer.Phi; |
|---|
| [1] | 1477 | |
|---|
| 1478 | "Shell Side Prandtl Number" |
|---|
| [45] | 1479 | Unity(i).Shell.HeatTransfer.PR=((Unity(i).Properties.Cold.Average.Cp/Unity(i).Properties.Cold.Average.Mw)*Unity(i).Properties.Cold.Average.Mu)/Unity(i).Properties.Cold.Average.K; |
|---|
| [1] | 1480 | |
|---|
| 1481 | "Shell Side Prandtl Number at Wall" |
|---|
| [45] | 1482 | Unity(i).Shell.HeatTransfer.PRw=((Unity(i).Properties.Cold.Wall.Cp/Unity(i).Properties.Cold.Average.Mw)*Unity(i).Properties.Cold.Wall.Mu)/Unity(i).Properties.Cold.Wall.K; |
|---|
| [1] | 1483 | |
|---|
| 1484 | "Tube Side Pressure Drop" |
|---|
| 1485 | Unity(i).Tubes.PressureDrop.PdTube = HE.DeltaPtube(Unity(i).Tubes.HeatTransfer.Re,Unity(i).Properties.Hot.Average.rho,Unity(i).Tubes.HeatTransfer.Vtube,Unity(i).Tubes.HeatTransfer.Phi); |
|---|
| 1486 | |
|---|
| 1487 | "Pressure Drop Tube Side Inlet Nozzle" |
|---|
| 1488 | Unity(i).Tubes.PressureDrop.Pdnozzle_in = HE.DeltaPtubeNozzlein(Unity(i).Properties.Hot.Inlet.rho,Unity(i).Properties.Hot.Inlet.Fw); |
|---|
| 1489 | |
|---|
| 1490 | "Velocity Tube Side Inlet Nozzle" |
|---|
| 1491 | Unity(i).Tubes.PressureDrop.Vnozzle_in = HE.TubeVelocityNozzlein(Unity(i).Properties.Hot.Inlet.rho,Unity(i).Properties.Hot.Inlet.Fw); |
|---|
| 1492 | |
|---|
| 1493 | "Pressure Drop Tube Side Outlet Nozzle" |
|---|
| 1494 | Unity(i).Tubes.PressureDrop.Pdnozzle_out = HE.DeltaPtubeNozzleout(Unity(i).Properties.Hot.Outlet.rho,Unity(i).Properties.Hot.Inlet.Fw); |
|---|
| 1495 | |
|---|
| 1496 | "Velocity Tube Side Outlet Nozzle" |
|---|
| 1497 | Unity(i).Tubes.PressureDrop.Vnozzle_out = HE.TubeVelocityNozzleout(Unity(i).Properties.Hot.Outlet.rho,Unity(i).Properties.Hot.Inlet.Fw); |
|---|
| 1498 | |
|---|
| 1499 | "Shell Pressure Drop Inlet Nozzle" |
|---|
| 1500 | Unity(i).Shell.PressureDrop.Pdnozzle_in = HE.DeltaPshellNozzleIn(Unity(i).Properties.Cold.Inlet.rho,Unity(i).Properties.Cold.Inlet.Fw); |
|---|
| 1501 | |
|---|
| 1502 | "Velocity Shell Side Inlet Nozzle" |
|---|
| 1503 | Unity(i).Shell.PressureDrop.Vnozzle_in = HE.ShellVelocityNozzleIn(Unity(i).Properties.Cold.Inlet.rho,Unity(i).Properties.Cold.Inlet.Fw); |
|---|
| 1504 | |
|---|
| 1505 | "Shell Pressure Drop Outlet Nozzle" |
|---|
| 1506 | Unity(i).Shell.PressureDrop.Pdnozzle_out = HE.DeltaPshellNozzleOut(Unity(i).Properties.Cold.Outlet.rho,Unity(i).Properties.Cold.Inlet.Fw); |
|---|
| 1507 | |
|---|
| 1508 | "Velocity Shell Side Outlet Nozzle" |
|---|
| 1509 | Unity(i).Shell.PressureDrop.Vnozzle_out = HE.ShellVelocityNozzleOut(Unity(i).Properties.Cold.Outlet.rho,Unity(i).Properties.Cold.Inlet.Fw); |
|---|
| 1510 | |
|---|
| 1511 | "Pressure Drop Hot Stream" |
|---|
| 1512 | Unity(i).Outlet.Hot.P = Unity(i).Inlet.Hot.P- Unity(i).Tubes.PressureDrop.Pdtotal; |
|---|
| 1513 | |
|---|
| 1514 | "Pressure Drop Cold Stream" |
|---|
| 1515 | Unity(i).Outlet.Cold.P = Unity(i).Inlet.Cold.P - Unity(i).Shell.PressureDrop.Pdtotal; |
|---|
| 1516 | |
|---|
| 1517 | |
|---|
| 1518 | end |
|---|
| 1519 | |
|---|
| [45] | 1520 | if side equal 1 |
|---|
| 1521 | |
|---|
| 1522 | then |
|---|
| 1523 | |
|---|
| 1524 | "Shell Side inlet Nozzle rho-V^2" |
|---|
| 1525 | Unity(i).Shell.PressureDrop.RVsquare_in = Unity(i).Properties.Hot.Inlet.rho*(Unity(i).Shell.PressureDrop.Vnozzle_in)^2; |
|---|
| 1526 | |
|---|
| 1527 | "Shell Side Outlet Nozzle rho-V^2" |
|---|
| 1528 | Unity(i).Shell.PressureDrop.RVsquare_out = Unity(i).Properties.Hot.Outlet.rho*(Unity(i).Shell.PressureDrop.Vnozzle_out)^2; |
|---|
| 1529 | |
|---|
| 1530 | else |
|---|
| 1531 | |
|---|
| 1532 | "Shell Side inlet Nozzle rho-V^2" |
|---|
| 1533 | Unity(i).Shell.PressureDrop.RVsquare_in = Unity(i).Properties.Cold.Inlet.rho*(Unity(i).Shell.PressureDrop.Vnozzle_in)^2; |
|---|
| 1534 | |
|---|
| 1535 | "Shell Side Outlet Nozzle rho-V^2" |
|---|
| 1536 | Unity(i).Shell.PressureDrop.RVsquare_out = Unity(i).Properties.Cold.Outlet.rho*(Unity(i).Shell.PressureDrop.Vnozzle_out)^2; |
|---|
| 1537 | |
|---|
| 1538 | end |
|---|
| 1539 | |
|---|
| [1] | 1540 | "Tube Resistance" |
|---|
| 1541 | Unity(i).Resistances.Rtube*(Unity(i).Tubes.HeatTransfer.htube*Ditube) = Dotube; |
|---|
| 1542 | |
|---|
| 1543 | "Wall Resistance" |
|---|
| 1544 | Unity(i).Resistances.Rwall=Dotube*ln(Dotube/Ditube)/(2*Kwall); |
|---|
| 1545 | |
|---|
| 1546 | "Shell Resistance" |
|---|
| 1547 | Unity(i).Resistances.Rshell*(Unity(i).Shell.HeatTransfer.hshell)=1; |
|---|
| 1548 | |
|---|
| 1549 | "Overall Heat Transfer Coefficient" |
|---|
| [68] | 1550 | Unity(i).Details.U*(Dotube/(Unity(i).Tubes.HeatTransfer.htube*Ditube)+(Dotube*ln(Dotube/Ditube)/(2*Kwall))+(1/(Unity(i).Shell.HeatTransfer.hshell)))=1; |
|---|
| [1] | 1551 | |
|---|
| 1552 | "Exchange Surface Area" |
|---|
| 1553 | Unity(i).Details.A=Pi*Dotube*Ntt*Ltube; |
|---|
| 1554 | |
|---|
| 1555 | "Baffles Spacing" |
|---|
| 1556 | Ltube = Unity(i).Baffles.Lsi+Unity(i).Baffles.Lso+Unity(i).Baffles.Ls*(Nb-1); |
|---|
| 1557 | |
|---|
| 1558 | "LMTD Correction Factor" |
|---|
| 1559 | Fc(i) = HE.EshellCorrectionFactor(Unity(i).Inlet.Hot.T,Unity(i).Outlet.Hot.T,Unity(i).Inlet.Cold.T,Unity(i).Outlet.Cold.T); |
|---|
| 1560 | |
|---|
| 1561 | "Counter Flow LMTD" |
|---|
| 1562 | LMTD(i) = HE.CounterLMTD(Unity(i).Inlet.Hot.T,Unity(i).Outlet.Hot.T,Unity(i).Inlet.Cold.T,Unity(i).Outlet.Cold.T); |
|---|
| 1563 | |
|---|
| 1564 | "Js Factor" |
|---|
| 1565 | Unity(i).Shell.HeatTransfer.Js = HE.JsFactor(Unity(i).Shell.HeatTransfer.Re,Unity(i).Baffles.Lsi,Unity(i).Baffles.Lso,Unity(i).Baffles.Ls); |
|---|
| 1566 | |
|---|
| 1567 | if side equal 1 |
|---|
| 1568 | |
|---|
| 1569 | then |
|---|
| 1570 | |
|---|
| 1571 | "Shell Side Reynolds Number" |
|---|
| [45] | 1572 | Unity(i).Shell.HeatTransfer.Re=(Dotube*Unity(i).Properties.Hot.Inlet.Fw/Unity(i).Shell.HeatTransfer.Sm)/Unity(i).Properties.Hot.Average.Mu; |
|---|
| [1] | 1573 | |
|---|
| 1574 | "Shell Heat Transfer Coefficient" |
|---|
| [45] | 1575 | Unity(i).Shell.HeatTransfer.hshell=Unity(i).Shell.HeatTransfer.Ji*(Unity(i).Properties.Hot.Average.Cp/Unity(i).Properties.Hot.Average.Mw)*(Unity(i).Properties.Hot.Inlet.Fw/Unity(i).Shell.HeatTransfer.Sm)*(Unity(i).Shell.HeatTransfer.PR^(-2/3))*Unity(i).Shell.HeatTransfer.Jtotal*Unity(i).Shell.HeatTransfer.Phi; |
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| [1] | 1576 | |
|---|
| 1577 | "Shell Pressure Drop Cross Flow" |
|---|
| 1578 | Unity(i).Shell.PressureDrop.PdCross = HE.DeltaPcross(Unity(i).Shell.HeatTransfer.Re,Unity(i).Baffles.Ls,Unity(i).Baffles.Lso,Unity(i).Baffles.Lsi,Unity(i).Properties.Hot.Inlet.Fw,Unity(i).Shell.HeatTransfer.Phi,Unity(i).Properties.Hot.Average.rho); |
|---|
| 1579 | |
|---|
| 1580 | "Shell Pressure Baffle Window" |
|---|
| 1581 | Unity(i).Shell.PressureDrop.Pdwindow = HE.DeltaPwindow(Unity(i).Properties.Hot.Inlet.Fw,Unity(i).Shell.HeatTransfer.Sm,Unity(i).Properties.Hot.Average.rho,Unity(i).Properties.Hot.Average.Mu,Unity(i).Baffles.Ls); |
|---|
| 1582 | |
|---|
| 1583 | "Shell Pressure End Zones" |
|---|
| 1584 | Unity(i).Shell.PressureDrop.PdEndZones = HE.DeltaPendZones(Unity(i).Shell.HeatTransfer.Re,Unity(i).Baffles.Ls,Unity(i).Baffles.Lso,Unity(i).Baffles.Lsi,Unity(i).Properties.Hot.Inlet.Fw,Unity(i).Shell.HeatTransfer.Phi,Unity(i).Properties.Hot.Average.rho); |
|---|
| 1585 | |
|---|
| 1586 | |
|---|
| 1587 | else |
|---|
| 1588 | |
|---|
| 1589 | "Shell Side Reynolds Number" |
|---|
| [45] | 1590 | Unity(i).Shell.HeatTransfer.Re=(Dotube*Unity(i).Properties.Cold.Inlet.Fw/Unity(i).Shell.HeatTransfer.Sm)/Unity(i).Properties.Cold.Average.Mu; |
|---|
| [1] | 1591 | |
|---|
| 1592 | "Shell Heat Transfer Coefficient" |
|---|
| [45] | 1593 | Unity(i).Shell.HeatTransfer.hshell=Unity(i).Shell.HeatTransfer.Ji*(Unity(i).Properties.Cold.Average.Cp/Unity(i).Properties.Cold.Average.Mw)*(Unity(i).Properties.Cold.Inlet.Fw/Unity(i).Shell.HeatTransfer.Sm)*(Unity(i).Shell.HeatTransfer.PR^(-2/3))*Unity(i).Shell.HeatTransfer.Jtotal*Unity(i).Shell.HeatTransfer.Phi; |
|---|
| [1] | 1594 | |
|---|
| 1595 | "Shell Pressure Drop Cross Flow" |
|---|
| 1596 | Unity(i).Shell.PressureDrop.PdCross = HE.DeltaPcross(Unity(i).Shell.HeatTransfer.Re,Unity(i).Baffles.Ls,Unity(i).Baffles.Lso,Unity(i).Baffles.Lsi,Unity(i).Properties.Cold.Inlet.Fw,Unity(i).Shell.HeatTransfer.Phi,Unity(i).Properties.Cold.Average.rho); |
|---|
| 1597 | |
|---|
| 1598 | "Shell Pressure Baffle Window" |
|---|
| 1599 | Unity(i).Shell.PressureDrop.Pdwindow = HE.DeltaPwindow(Unity(i).Properties.Cold.Inlet.Fw,Unity(i).Shell.HeatTransfer.Sm,Unity(i).Properties.Cold.Average.rho,Unity(i).Properties.Cold.Average.Mu,Unity(i).Baffles.Ls); |
|---|
| 1600 | |
|---|
| 1601 | "Shell Pressure End Zones" |
|---|
| 1602 | Unity(i).Shell.PressureDrop.PdEndZones = HE.DeltaPendZones(Unity(i).Shell.HeatTransfer.Re,Unity(i).Baffles.Ls,Unity(i).Baffles.Lso,Unity(i).Baffles.Lsi,Unity(i).Properties.Cold.Inlet.Fw,Unity(i).Shell.HeatTransfer.Phi,Unity(i).Properties.Cold.Average.rho); |
|---|
| 1603 | |
|---|
| 1604 | |
|---|
| 1605 | end |
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| 1606 | |
|---|
| 1607 | "Exchange Surface Area" |
|---|
| [68] | 1608 | # Unity(i).Details.Q = Unity(i).Details.U*Unity(i).Details.A*Fc(i)*LMTD(i); |
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| 1609 | Unity(i).Details.Q = Unity(i).Details.U*Pi*Dotube*Ntt*Ltube*Fc(i)*LMTD(i); |
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| [1] | 1610 | |
|---|
| 1611 | "Mean Temperature Difference" |
|---|
| 1612 | MTD(i) = Fc(i)*LMTD(i); |
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| 1613 | |
|---|
| 1614 | end |
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| 1615 | |
|---|
| 1616 | SET |
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| [26] | 1617 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
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| [1] | 1618 | # Set Parameters for heatex Calculation |
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| [26] | 1619 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
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| [1] | 1620 | Pi = 3.14159265; |
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| 1621 | HE.Tpass = Tpass; |
|---|
| 1622 | HE.Nss = Nss; |
|---|
| 1623 | HE.Ntt = Ntt; |
|---|
| 1624 | HE.Pattern = Pattern; |
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| 1625 | HE.Bc = Bc; |
|---|
| 1626 | HE.Donozzle_Shell = Donozzle_Shell; |
|---|
| 1627 | HE.Dinozzle_Shell = Dinozzle_Shell; |
|---|
| 1628 | HE.Honozzle_Shell = Honozzle_Shell; |
|---|
| 1629 | HE.Hinozzle_Shell = Hinozzle_Shell; |
|---|
| 1630 | HE.Donozzle_Tube = Donozzle_Tube; |
|---|
| 1631 | HE.Dinozzle_Tube = Dinozzle_Tube; |
|---|
| 1632 | HE.Nb = Nb; |
|---|
| 1633 | HE.Dishell = Dishell; |
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| 1634 | HE.Lcf = Lcf; |
|---|
| 1635 | HE.Ltube = Ltube; |
|---|
| 1636 | HE.pitch = pitch; |
|---|
| 1637 | HE.Dotube = Dotube; |
|---|
| 1638 | HE.Ditube = Ditube; |
|---|
| 1639 | HE.Lcd = Lcd; |
|---|
| 1640 | HE.Ltd = Ltd; |
|---|
| 1641 | side = HE.FluidAlocation(); |
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| 1642 | |
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| 1643 | end |
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| 1644 | |
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