| 1 | #*--------------------------------------------------------------------* |
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| 2 | * Heat Exchangers Abstract Models |
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| 3 | *-------------------------------------------------------------------- |
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| 4 | * - Inlet_Main_Stream : Inlet Streams |
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| 5 | *-------------------------------------------------------------------- |
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| 6 | * - Hot : Inlet Hot Stream |
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| 7 | * - Cold : Inlet Cold Stream |
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| 8 | *-------------------------------------------------------------------- |
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| 9 | * - Outlet_Main_Stream : Outlet Streams |
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| 10 | *-------------------------------------------------------------------- |
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| 11 | * - Hot : Outlet Hot Stream |
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| 12 | * - Cold : Outlet Cold Stream |
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| 13 | *-------------------------------------------------------------------- |
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| 14 | * - Main_Properties : Physical Properties for Hot and Cold Side |
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| 15 | *-------------------------------------------------------------------- |
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| 16 | * Physical_Properties |
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| 17 | * Properties_In_Out : Inlet/Outlet Physical Properties |
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| 18 | * Properties_Average : Average Physical Properties |
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| 19 | * Properties_Wall : Physical Properties at Wall Temperature |
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| 20 | *-------------------------------------------------------------------- |
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| 21 | * - Tube_Side_Main : Tube Side Main Variables |
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| 22 | *---------------------------------------------------------------------- |
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| 23 | * Tube_Pdrop : Tube Side Pressure Drop |
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| 24 | * Tube_Heat_Transfer : Tube Side Heat Transfer |
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| 25 | *---------------------------------------------------------------------- |
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| 26 | * - Shell_Side_Main : Shell Side Main Variables |
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| 27 | *---------------------------------------------------------------------- |
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| 28 | * Shell_Pdrop : Shell Side Pressure Drop |
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| 29 | * Shell_Heat_Transfer : Shell Side Heat Transfer |
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| 30 | *---------------------------------------------------------------------- |
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| 31 | * - Baffles_Main : Baffles Spacing |
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| 32 | *---------------------------------------------------------------------- |
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| 33 | * - Main_Resistances : Thermal Resistances |
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| 34 | *---------------------------------------------------------------------- |
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| 35 | * - Details_Main : Heat Exchanger Thermal Details |
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| 36 | *---------------------------------------------------------------------- |
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| 37 | * - Main_Pdrop : Heat Exchanger Pressure Drop (Simplified) |
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| 38 | * Basic_Pdrop : Hot and Cold Side Pressure Drop |
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| 39 | *---------------------------------------------------------------------- |
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| 40 | * - Main_DoublePipe : Double Pipe Heat Exchanger Block |
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| 41 | * DoublePipe_HeatTransfer |
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| 42 | * DoublePipe_PressureDrop |
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| 43 | *---------------------------------------------------------------------- |
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| 44 | * Author: Gerson Balbueno Bicca |
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| 45 | * $Id: HEX_Engine.mso 68 2006-11-27 20:37:59Z bicca $ |
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| 46 | *--------------------------------------------------------------------*# |
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| 47 | |
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| 48 | using "streams"; |
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| 49 | |
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| 50 | Model Inlet_Main_Stream |
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| 51 | #===================================================================== |
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| 52 | # Inlet Streams |
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| 53 | #===================================================================== |
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| 54 | VARIABLES |
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| 55 | Hot as stream; # Inlet Hot Stream |
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| 56 | Cold as stream; # Inlet Cold Stream |
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| 57 | end |
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| 58 | |
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| 59 | Model Outlet_Main_Stream |
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| 60 | #===================================================================== |
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| 61 | # Outlet Streams |
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| 62 | #===================================================================== |
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| 63 | VARIABLES |
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| 64 | Hot as stream_therm; # Outlet Hot Stream |
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| 65 | Cold as stream_therm; # Outlet Cold Stream |
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| 66 | end |
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| 67 | |
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| 68 | #===================================================================== |
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| 69 | # Heat Exchangers Physical Properties |
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| 70 | #===================================================================== |
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| 71 | |
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| 72 | Model Properties_Average |
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| 73 | #===================================================================== |
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| 74 | # Average Physical Properties |
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| 75 | #===================================================================== |
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| 76 | VARIABLES |
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| 77 | Mw as molweight (Brief="Average Mol Weight",Default=75, Lower=1, Upper=1e8); |
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| 78 | T as temperature (Brief="Average Temperature",Lower=50); |
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| 79 | P as pressure (Brief="Average Pressure",Default=1, Lower=1e-10, Upper=30); |
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| 80 | rho as dens_mass (Brief="Stream Density" ,Default=1000, Lower=1e-3, Upper=5e5); |
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| 81 | Mu as viscosity (Brief="Stream Viscosity",Lower=0.0001); |
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| 82 | Cp as cp_mol (Brief="Stream Molar Heat Capacity", Upper=10e10); |
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| 83 | K as conductivity (Brief="Stream Thermal Conductivity", Default=1.0, Lower=1e-5, Upper=500); |
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| 84 | end |
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| 85 | |
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| 86 | Model Properties_In_Out |
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| 87 | #===================================================================== |
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| 88 | # Inlet/Outlet Physical Properties |
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| 89 | #===================================================================== |
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| 90 | VARIABLES |
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| 91 | Fw as flow_mass (Brief="Stream Mass Flow"); |
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| 92 | rho as dens_mass (Brief="Stream Density" ,Default=1000, Lower=1e-3, Upper=5e5); |
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| 93 | Mu as viscosity (Brief="Stream Viscosity",Default=1, Lower=1e-5, Upper=1e5); |
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| 94 | Cp as cp_mol (Brief="Stream Molar Heat Capacity", Upper=10e10); |
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| 95 | K as conductivity (Brief="Stream Thermal Conductivity", Default=1.0, Lower=1e-5, Upper=500); |
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| 96 | end |
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| 97 | |
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| 98 | Model Properties_Wall |
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| 99 | #===================================================================== |
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| 100 | # Physical Properties at Wall Temperature |
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| 101 | #===================================================================== |
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| 102 | VARIABLES |
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| 103 | Mu as viscosity (Brief="Stream Viscosity",Default=1, Lower=1e-5, Upper=1e5); |
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| 104 | Cp as cp_mol (Brief="Stream Molar Heat Capacity", Upper=10e10); |
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| 105 | K as conductivity (Brief="Stream Thermal Conductivity", Default=1.0, Lower=1e-5, Upper=500); |
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| 106 | Twall as temperature (Brief="Wall Temperature",Lower=50); |
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| 107 | end |
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| 108 | |
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| 109 | Model Physical_Properties |
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| 110 | #===================================================================== |
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| 111 | # Physical Properties |
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| 112 | #===================================================================== |
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| 113 | VARIABLES |
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| 114 | Inlet as Properties_In_Out; # Properties at Inlet Stream |
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| 115 | Average as Properties_Average; # Properties at Average Temperature |
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| 116 | Outlet as Properties_In_Out; # Properties at Outlet Stream |
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| 117 | Wall as Properties_Wall; # Properties at Wall Temperature |
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| 118 | end |
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| 119 | |
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| 120 | Model Main_Properties |
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| 121 | #===================================================================== |
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| 122 | # Physical Properties for Hot and Cold Side |
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| 123 | #===================================================================== |
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| 124 | VARIABLES |
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| 125 | Hot as Physical_Properties; # Hot Stream |
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| 126 | Cold as Physical_Properties; # Cold Stream |
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| 127 | end |
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| 128 | |
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| 129 | Model Tube_Pdrop |
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| 130 | #===================================================================== |
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| 131 | # Tube Side Pressure Drop block |
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| 132 | #===================================================================== |
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| 133 | VARIABLES |
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| 134 | |
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| 135 | PdTube as press_delta (Brief="Tube Pressure Drop",Default=0.01, Lower=1e-10); |
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| 136 | Pdtotal as press_delta (Brief="Total Pressure Drop",Default=0.01, Lower=1e-10); |
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| 137 | Pdnozzle_in as press_delta (Brief="Inlet Nozzle Pressure Drop",Default=0.01, Lower=0); |
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| 138 | Pdnozzle_out as press_delta (Brief="Outlet Nozzle Pressure Drop",Default=0.01, Lower=0); |
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| 139 | Vnozzle_in as velocity (Brief="Inlet Nozzle Velocity",Default=1, Upper=1e5, Lower=0); |
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| 140 | Vnozzle_out as velocity (Brief="Outlet Nozzle Velocity",Default=1, Upper=1e5, Lower=0); |
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| 141 | |
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| 142 | EQUATIONS |
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| 143 | "Total Pressure Drop" |
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| 144 | Pdtotal = PdTube + Pdnozzle_in + Pdnozzle_out; |
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| 145 | |
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| 146 | end |
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| 147 | |
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| 148 | Model Tube_Heat_Transfer |
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| 149 | #===================================================================== |
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| 150 | # Tube Side Heat Transfer Block |
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| 151 | #===================================================================== |
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| 152 | VARIABLES |
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| 153 | Re as positive (Brief="Tube Side Reynolds Number",Default=1000,Lower=1); |
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| 154 | htube as heat_trans_coeff (Brief="Tube Side Film Coefficient",Default=1,Lower=1e-12, Upper=1e6); |
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| 155 | PR as positive (Brief="Tube Side Prandtl Number",Default=0.5,Lower=1e-8); |
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| 156 | PRw as positive (Brief="Tube Side Prandtl Number at Wall Temperature",Default=0.5,Lower=1e-8); |
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| 157 | Phi as positive (Brief="Phi Correction",Default=1,Lower=1e-3); |
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| 158 | Vtube as velocity (Brief="Tube Side Velocity",Lower=1e-8); |
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| 159 | end |
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| 160 | |
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| 161 | Model Shell_Pdrop |
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| 162 | #===================================================================== |
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| 163 | # Shell Side Pressure Drop block |
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| 164 | #===================================================================== |
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| 165 | VARIABLES |
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| 166 | PdCross as press_delta (Brief="Cross Flow Pressure Drop",Default=0.01, Lower=0); |
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| 167 | PdEndZones as press_delta (Brief="End Zones Pressure Drop",Default=0.01, Lower=0); |
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| 168 | Pdwindow as press_delta (Brief="Window Pressure Drop",Default=0.01, Lower=1e-10); |
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| 169 | Pdtotal as press_delta (Brief="Total Pressure Drop",Default=0.01, Lower=0); |
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| 170 | Pdnozzle_in as press_delta (Brief="Inlet Nozzle Pressure Drop",Default=0.01, Lower=0); |
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| 171 | Pdnozzle_out as press_delta (Brief="Outlet Nozzle Pressure Drop",Default=0.01, Lower=0); |
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| 172 | Vnozzle_in as velocity (Brief="Inlet Nozzle Velocity",Default=1, Upper=1e5, Lower=0); |
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| 173 | Vnozzle_out as velocity (Brief="Outlet Nozzle Velocity",Default=1, Upper=1e5, Lower=0); |
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| 174 | RVsquare_in as flux_mass (Brief="Inlet Nozzle rho-V^2"); |
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| 175 | RVsquare_out as flux_mass (Brief="Outlet Nozzle rho-V^2"); |
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| 176 | |
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| 177 | EQUATIONS |
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| 178 | |
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| 179 | "Shell Side Total Pressure Drop" |
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| 180 | Pdtotal = PdCross + PdEndZones + Pdnozzle_in + Pdnozzle_out + Pdwindow; |
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| 181 | |
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| 182 | end |
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| 183 | |
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| 184 | Model Shell_Heat_Transfer |
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| 185 | #===================================================================== |
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| 186 | # Shell Side Heat Transfer Block |
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| 187 | #===================================================================== |
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| 188 | VARIABLES |
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| 189 | Re as positive (Brief="Shell Side Reynolds Number",Default=100,Lower=1); |
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| 190 | PR as positive (Brief="Shell Side Prandtl Number",Default=0.7,Lower=1e-6); |
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| 191 | PRw as positive (Brief="Shell Side Prandtl Number",Default=0.5,Lower=1e-8); |
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| 192 | hshell as heat_trans_coeff (Brief="Shell Side Film Coefficient",Default=1,Lower=1e-12, Upper=1e6); |
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| 193 | Phi as positive (Brief="Phi Correction",Default=1,Lower=1e-3); |
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| 194 | Ji as constant (Brief="Shell Side Ji Factor",Default=0.05); |
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| 195 | Jr as positive (Brief="Shell Side Jr Factor",Lower=10e-6); |
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| 196 | Jl as positive (Brief="Shell Side Jl Factor",Lower=10e-6); |
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| 197 | Jb as positive (Brief="Shell Side Jb Factor",Lower=10e-6); |
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| 198 | Jc as positive (Brief="Shell Side Jc Factor",Lower=10e-6); |
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| 199 | Js as positive (Brief="Shell Side Js Factor",Lower=10e-6); |
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| 200 | Jtotal as positive (Brief="Shell Side Jtotal Factor",Lower=10e-6); |
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| 201 | Sm as area (Brief="Shell Side Cross Flow Area",Default=0.05,Lower=10e-6); |
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| 202 | |
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| 203 | end |
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| 204 | |
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| 205 | Model Baffles_Main |
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| 206 | #===================================================================== |
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| 207 | # Baffles Spacing |
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| 208 | #===================================================================== |
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| 209 | VARIABLES |
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| 210 | Ls as length (Brief="Central Baffle Spacing",Lower=1e-8); |
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| 211 | Lsi as length (Brief="Inlet Baffle Spacing",Lower=1e-8); |
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| 212 | Lso as length (Brief="Outlet Baffle Spacing",Lower=1e-8); |
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| 213 | |
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| 214 | end |
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| 215 | |
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| 216 | Model Main_Resistances |
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| 217 | #===================================================================== |
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| 218 | # Resistances |
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| 219 | #===================================================================== |
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| 220 | VARIABLES |
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| 221 | |
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| 222 | Rtube as positive (Brief="Tube Resistance",Unit="m^2*K/kW",Lower=1e-6); |
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| 223 | Rwall as positive (Brief="Wall Resistance",Unit="m^2*K/kW",Lower=1e-6); |
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| 224 | Rshell as positive (Brief="Shell Resistance",Unit="m^2*K/kW",Lower=1e-6); |
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| 225 | |
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| 226 | end |
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| 227 | |
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| 228 | Model Details_Main |
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| 229 | #===================================================================== |
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| 230 | # Heat Exchanger Thermal Details |
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| 231 | #===================================================================== |
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| 232 | VARIABLES |
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| 233 | A as area (Brief="Exchange Surface Area"); |
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| 234 | Q as power (Brief="Heat Transfer", Default=7000, Lower=1e-6, Upper=1e10); |
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| 235 | U as heat_trans_coeff (Brief="Overall Heat Transfer Coefficient",Default=1,Lower=1e-6,Upper=1e10); |
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| 236 | Ch as positive (Brief="Hot Stream Heat Capacity",Lower=1e-3,Default=1e3,Unit="W/K"); |
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| 237 | Cc as positive (Brief="Cold Stream Heat Capacity",Lower=1e-3,Default=1e3,Unit="W/K"); |
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| 238 | Cr as positive (Brief="Heat Capacity Ratio",Default=0.5,Lower=1e-6); |
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| 239 | Cmin as positive (Brief="Minimum Heat Capacity",Lower=1e-10,Default=1e3,Unit="W/K"); |
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| 240 | Cmax as positive (Brief="Maximum Heat Capacity",Lower=1e-10,Default=1e3,Unit="W/K"); |
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| 241 | NTU as positive (Brief="Number of Units Transference",Default=0.05,Lower=1e-10); |
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| 242 | |
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| 243 | EQUATIONS |
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| 244 | "Number of Units Transference" |
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| 245 | NTU*Cmin = U*A; |
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| 246 | end |
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| 247 | |
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| 248 | Model Tube_Side_Main |
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| 249 | #===================================================================== |
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| 250 | # Tube Side Main Variables |
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| 251 | #===================================================================== |
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| 252 | VARIABLES |
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| 253 | PressureDrop as Tube_Pdrop; #Tube Side Pressure Drop |
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| 254 | HeatTransfer as Tube_Heat_Transfer; #Tube Side Heat Transfer |
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| 255 | end |
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| 256 | |
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| 257 | Model Shell_Side_Main |
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| 258 | #===================================================================== |
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| 259 | # Shell Side Main Variables |
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| 260 | #===================================================================== |
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| 261 | VARIABLES |
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| 262 | PressureDrop as Shell_Pdrop; # Shell Side Pressure Drop |
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| 263 | HeatTransfer as Shell_Heat_Transfer; # Shell Side Heat Transfer |
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| 264 | end |
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| 265 | |
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| 266 | Model Basic_Pdrop |
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| 267 | #===================================================================== |
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| 268 | # Pressure Drop |
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| 269 | #===================================================================== |
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| 270 | VARIABLES |
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| 271 | Pdrop as press_delta (Brief="Pressure Drop",Default=0.01, Lower=0); |
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| 272 | FPdrop as Real (Brief="Pressure Drop : Fraction of Inlet",Lower=0,Upper=0.8); |
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| 273 | end |
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| 274 | |
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| 275 | Model Main_Pdrop |
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| 276 | #===================================================================== |
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| 277 | # Pressure Drop block |
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| 278 | #===================================================================== |
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| 279 | VARIABLES |
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| 280 | Hot as Basic_Pdrop;# Hot Stream |
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| 281 | Cold as Basic_Pdrop;# Cold Stream |
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| 282 | end |
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| 283 | |
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| 284 | Model DoublePipe_HeatTransfer |
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| 285 | #===================================================================== |
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| 286 | # Heat Transfer |
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| 287 | #===================================================================== |
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| 288 | PARAMETERS |
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| 289 | As as area (Brief="Cross Sectional Area for Flow",Default=0.05,Lower=1e-8); |
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| 290 | Dh as length (Brief="Hydraulic Diameter of Pipe for Heat Transfer",Lower=1e-8); |
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| 291 | |
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| 292 | VARIABLES |
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| 293 | Re as positive (Brief="Reynolds Number",Default=100,Lower=1); |
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| 294 | hcoeff as heat_trans_coeff (Brief="Film Coefficient",Default=1,Lower=1e-12, Upper=1e6); |
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| 295 | PR as positive (Brief="Prandtl Number",Default=0.5,Lower=1e-8); |
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| 296 | Phi as positive (Brief="Phi Correction",Default=1,Lower=1e-3); |
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| 297 | Vmean as velocity (Brief="Tube Velocity",Lower=1e-8); |
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| 298 | end |
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| 299 | |
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| 300 | Model DoublePipe_PressureDrop |
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| 301 | #===================================================================== |
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| 302 | # Pressure Drop |
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| 303 | #===================================================================== |
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| 304 | PARAMETERS |
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| 305 | Dh as length (Brief="Hydraulic Diameter of Pipe for Pressure Drop",Lower=1e-6); |
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| 306 | |
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| 307 | VARIABLES |
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| 308 | Pdrop as press_delta (Brief="Pressure Drop",Default=0.01, Lower=1e-10); |
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| 309 | fi as fricfactor (Brief="Friction Factor", Default=0.05, Lower=1e-10, Upper=2000); |
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| 310 | Re as positive (Brief="Reynolds Number",Default=100,Lower=1); |
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| 311 | end |
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| 312 | |
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| 313 | Model Main_DoublePipe |
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| 314 | VARIABLES |
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| 315 | HeatTransfer as DoublePipe_HeatTransfer; |
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| 316 | PressureDrop as DoublePipe_PressureDrop; |
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| 317 | end |
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