| 1 | #*--------------------------------------------------------------------* |
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| 2 | * |
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| 3 | *---------------------------------------------------------------------- |
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| 4 | * Author: Gerson Balbueno Bicca |
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| 5 | * $Id: HEX_Engine.mso 1 2006-06-20 17:33:53Z rafael $ |
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| 6 | *--------------------------------------------------------------------*# |
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| 7 | |
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| 8 | #using "streamspetroil"; |
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| 9 | using "streams"; |
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| 10 | #===================================================================== |
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| 11 | # Hot and Cold Streams |
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| 12 | #===================================================================== |
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| 13 | |
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| 14 | Model Inlet_Main_Stream |
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| 15 | #===================================================================== |
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| 16 | # Inlet Streams |
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| 17 | #===================================================================== |
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| 18 | VARIABLES |
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| 19 | Hot as stream;# Inlet Hot Stream |
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| 20 | Cold as stream;# Inlet Cold Stream |
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| 21 | |
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| 22 | end |
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| 23 | |
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| 24 | Model Outlet_Main_Stream |
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| 25 | #===================================================================== |
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| 26 | # Outlet Streams |
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| 27 | #===================================================================== |
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| 28 | VARIABLES |
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| 29 | Hot as stream_therm;# Outlet Hot Stream |
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| 30 | Cold as stream_therm;# Outlet Cold Stream |
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| 31 | |
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| 32 | end |
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| 33 | |
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| 34 | #===================================================================== |
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| 35 | # Heat Exchangers Physical Properties |
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| 36 | #===================================================================== |
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| 37 | |
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| 38 | Model Properties_Average |
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| 39 | #===================================================================== |
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| 40 | # Average Physical Properties |
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| 41 | #===================================================================== |
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| 42 | VARIABLES |
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| 43 | |
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| 44 | Mw as molweight (Brief="Average Mol Weight",Default=75, Lower=1, Upper=1e8); |
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| 45 | T as temperature (Brief="Average Temperature",Lower=50); |
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| 46 | P as pressure (Brief="Average Pressure",Default=1, Lower=1e-10, Upper=30); |
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| 47 | rho as dens_mass (Brief="Stream Density" ,Default=1000, Lower=1e-3, Upper=5e5); |
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| 48 | Mu as viscosity (Brief="Stream Viscosity",Lower=0.0001); |
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| 49 | Cp as cp_mol (Brief="Stream Molar Heat Capacity", Upper=10e10); |
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| 50 | K as conductivity (Brief="Stream Thermal Conductivity", Default=1.0, Lower=1e-5, Upper=500); |
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| 51 | |
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| 52 | end |
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| 53 | |
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| 54 | Model Properties_In_Out |
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| 55 | #===================================================================== |
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| 56 | # Inlet/Outlet Physical Properties |
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| 57 | #===================================================================== |
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| 58 | VARIABLES |
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| 59 | |
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| 60 | Fw as flow_mass (Brief="Inlet Stream Mass Flow"); |
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| 61 | rho as dens_mass (Brief="Stream Density" ,Default=1000, Lower=1e-3, Upper=5e5); |
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| 62 | Mu as viscosity (Brief="Stream Viscosity",Default=1, Lower=1e-5, Upper=1e5); |
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| 63 | Cp as cp_mol (Brief="Stream Molar Heat Capacity", Upper=10e10); |
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| 64 | K as conductivity (Brief="Stream Thermal Conductivity", Default=1.0, Lower=1e-5, Upper=500); |
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| 65 | |
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| 66 | end |
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| 67 | |
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| 68 | Model Properties_Wall |
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| 69 | #===================================================================== |
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| 70 | # Physical Properties at Wall Temperature |
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| 71 | #===================================================================== |
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| 72 | VARIABLES |
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| 73 | |
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| 74 | Mu as viscosity (Brief="Stream Viscosity",Default=1, Lower=1e-5, Upper=1e5); |
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| 75 | Cp as cp_mol (Brief="Stream Molar Heat Capacity", Upper=10e10); |
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| 76 | K as conductivity (Brief="Stream Thermal Conductivity", Default=1.0, Lower=1e-5, Upper=500); |
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| 77 | Twall as temperature (Brief="Tube Wall Temperature",Lower=50); |
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| 78 | |
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| 79 | end |
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| 80 | |
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| 81 | Model Physical_Properties |
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| 82 | #===================================================================== |
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| 83 | # Physical Properties |
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| 84 | #===================================================================== |
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| 85 | VARIABLES |
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| 86 | |
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| 87 | Inlet as Properties_In_Out; # Properties at Inlet Stream |
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| 88 | Average as Properties_Average; # Properties at Average Temperature |
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| 89 | Outlet as Properties_In_Out; # Properties at Outlet Stream |
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| 90 | Wall as Properties_Wall; # Properties at Wall Temperature |
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| 91 | |
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| 92 | end |
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| 93 | |
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| 94 | Model Main_Properties |
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| 95 | #===================================================================== |
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| 96 | # Physical Properties for Hot and Cold Side |
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| 97 | #===================================================================== |
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| 98 | VARIABLES |
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| 99 | |
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| 100 | Hot as Physical_Properties;# Hot Stream |
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| 101 | Cold as Physical_Properties;# Cold Stream |
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| 102 | |
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| 103 | end |
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| 104 | |
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| 105 | Model Tube_Pdrop |
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| 106 | #===================================================================== |
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| 107 | # Pressure Drop block |
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| 108 | #===================================================================== |
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| 109 | VARIABLES |
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| 110 | |
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| 111 | PdTube as press_delta(Default=0.01, Lower=1e-10); |
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| 112 | Pdtotal as press_delta(Default=0.01, Lower=1e-10); |
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| 113 | Pdnozzle_in as press_delta(Default=0.01, Lower=1e-10); |
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| 114 | Pdnozzle_out as press_delta(Default=0.01, Lower=1e-10); |
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| 115 | Vnozzle_in as velocity (Default=1, Upper=1e5, Lower=1e-10); |
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| 116 | Vnozzle_out as velocity (Default=1, Upper=1e5, Lower=1e-10); |
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| 117 | |
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| 118 | EQUATIONS |
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| 119 | |
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| 120 | Pdtotal = PdTube + Pdnozzle_in + Pdnozzle_out; |
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| 121 | |
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| 122 | end |
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| 123 | |
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| 124 | Model Tube_Pdrop_Nozzles |
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| 125 | #===================================================================== |
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| 126 | # Pressure Drop block |
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| 127 | #===================================================================== |
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| 128 | VARIABLES |
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| 129 | |
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| 130 | Pdnozzle_in as press_delta(Default=0.01, Lower=1e-10); |
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| 131 | Pdnozzle_out as press_delta(Default=0.01, Lower=1e-10); |
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| 132 | Vnozzle_in as velocity (Default=1, Upper=1e5, Lower=1e-10); |
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| 133 | Vnozzle_out as velocity (Default=1, Upper=1e5, Lower=1e-10); |
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| 134 | |
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| 135 | end |
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| 136 | |
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| 137 | Model Tube_Pdrop_Disc |
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| 138 | #===================================================================== |
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| 139 | # Pressure Drop block |
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| 140 | #===================================================================== |
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| 141 | VARIABLES |
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| 142 | |
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| 143 | PdTube as press_delta(Default=0.01, Lower=1e-10); |
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| 144 | Pdtotal as press_delta(Default=0.01, Lower=1e-10); |
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| 145 | |
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| 146 | EQUATIONS |
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| 147 | |
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| 148 | Pdtotal = PdTube; |
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| 149 | |
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| 150 | end |
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| 151 | |
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| 152 | Model Tube_Heat_Transfer |
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| 153 | #===================================================================== |
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| 154 | # Pressure Drop block |
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| 155 | #===================================================================== |
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| 156 | VARIABLES |
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| 157 | Re as positive (Brief="Tube Side Reynolds Number",Default=1000,Lower=1); |
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| 158 | htube as heat_trans_coeff (Brief="Tube Side Film Coefficient",Default=1,Lower=1e-12, Upper=1e6); |
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| 159 | PR as positive (Brief="Tube Side Prandtl Number",Default=0.5,Lower=1e-8); |
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| 160 | PRw as positive (Brief="Tube Side Prandtl Number",Default=0.5,Lower=1e-8); |
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| 161 | Phi as positive (Brief="Phi Correction",Default=1,Lower=1e-3); |
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| 162 | Vtube as velocity (Brief="Tube Side Velocity",Lower=1e-8); |
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| 163 | |
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| 164 | |
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| 165 | end |
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| 166 | |
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| 167 | Model Shell_Pdrop |
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| 168 | #===================================================================== |
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| 169 | # Pressure Drop block |
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| 170 | #===================================================================== |
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| 171 | VARIABLES |
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| 172 | |
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| 173 | PdCross as press_delta(Default=0.01, Lower=1e-10); |
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| 174 | PdEndZones as press_delta(Default=0.01, Lower=1e-10); |
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| 175 | Pdwindow as press_delta(Default=0.01, Lower=1e-10); |
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| 176 | Pdtotal as press_delta(Default=0.01, Lower=1e-10); |
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| 177 | Pdnozzle_in as press_delta(Default=0.01, Lower=1e-10); |
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| 178 | Pdnozzle_out as press_delta(Default=0.01, Lower=1e-10); |
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| 179 | Vnozzle_in as velocity(Default=1, Upper=1e5, Lower=1e-10); |
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| 180 | Vnozzle_out as velocity(Default=1, Upper=1e5, Lower=1e-10); |
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| 181 | |
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| 182 | EQUATIONS |
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| 183 | |
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| 184 | Pdtotal = PdCross + PdEndZones + Pdnozzle_in + Pdnozzle_out + Pdwindow; |
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| 185 | |
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| 186 | end |
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| 187 | |
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| 188 | Model Shell_Pdrop_Nozzles |
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| 189 | #===================================================================== |
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| 190 | # Pressure Drop block |
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| 191 | #===================================================================== |
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| 192 | VARIABLES |
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| 193 | |
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| 194 | Pdnozzle_in as press_delta(Default=0.01, Lower=1e-10); |
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| 195 | Pdnozzle_out as press_delta(Default=0.01, Lower=1e-10); |
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| 196 | Vnozzle_in as velocity(Default=1, Upper=1e5, Lower=1e-10); |
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| 197 | Vnozzle_out as velocity(Default=1, Upper=1e5, Lower=1e-10); |
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| 198 | |
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| 199 | end |
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| 200 | |
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| 201 | Model Shell_Pdrop_Disc |
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| 202 | #===================================================================== |
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| 203 | # Pressure Drop block |
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| 204 | #===================================================================== |
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| 205 | VARIABLES |
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| 206 | |
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| 207 | PdCross as press_delta(Default=0.01, Lower=1e-10); |
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| 208 | PdEndZones as press_delta(Default=0.01, Lower=1e-10); |
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| 209 | Pdwindow as press_delta(Default=0.01, Lower=1e-10); |
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| 210 | Pdtotal as press_delta(Default=0.01, Lower=1e-10); |
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| 211 | |
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| 212 | EQUATIONS |
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| 213 | |
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| 214 | Pdtotal = PdCross + PdEndZones + Pdwindow; |
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| 215 | |
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| 216 | end |
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| 217 | |
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| 218 | Model Shell_Heat_Transfer |
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| 219 | #===================================================================== |
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| 220 | # |
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| 221 | #===================================================================== |
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| 222 | VARIABLES |
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| 223 | Re as positive (Brief="Shell Side Reynolds Number",Default=100,Lower=1); |
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| 224 | PR as positive (Brief="Shell Side Prandtl Number",Default=0.7,Lower=1e-6); |
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| 225 | PRw as positive (Brief="Shell Side Prandtl Number",Default=0.5,Lower=1e-8); |
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| 226 | hshell as heat_trans_coeff (Brief="Shell Side Film Coefficient",Default=1,Lower=1e-12, Upper=1e6); |
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| 227 | Phi as positive (Brief="Phi Correction",Default=1,Lower=1e-3); |
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| 228 | Ji as constant (Brief="Shell Side Ji Factor",Default=0.05); |
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| 229 | Jr as positive (Brief="Shell Side Jr Factor",Lower=10e-6); |
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| 230 | Jl as positive (Brief="Shell Side Jl Factor",Lower=10e-6); |
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| 231 | Jb as positive (Brief="Shell Side Jb Factor",Lower=10e-6); |
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| 232 | Jc as positive (Brief="Shell Side Jc Factor",Lower=10e-6); |
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| 233 | Js as positive (Brief="Shell Side Js Factor",Lower=10e-6); |
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| 234 | Jtotal as positive (Brief="Shell Side Jtotal Factor",Lower=10e-6); |
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| 235 | Sm as area (Brief="Shell Side Cross Flow Area",Default=0.05,Lower=10e-6); |
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| 236 | |
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| 237 | end |
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| 238 | |
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| 239 | Model Tube_Side_Main |
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| 240 | #===================================================================== |
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| 241 | # Tube Side Main Variables |
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| 242 | #===================================================================== |
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| 243 | VARIABLES |
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| 244 | PressureDrop as Tube_Pdrop; |
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| 245 | HeatTransfer as Tube_Heat_Transfer; |
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| 246 | end |
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| 247 | |
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| 248 | Model Tube_Side_Main_Disc |
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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_Disc; |
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| 254 | HeatTransfer as Tube_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; |
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| 263 | HeatTransfer as Shell_Heat_Transfer; |
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| 264 | end |
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| 265 | |
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| 266 | Model Shell_Side_Main_Disc |
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| 267 | #===================================================================== |
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| 268 | # Shell Side Main Variables |
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| 269 | #===================================================================== |
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| 270 | VARIABLES |
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| 271 | PressureDrop as Shell_Pdrop_Disc; |
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| 272 | HeatTransfer as Shell_Heat_Transfer; |
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| 273 | end |
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| 274 | |
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| 275 | Model Pdrop_Nozzles_Main |
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| 276 | #===================================================================== |
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| 277 | # Tube Side Main Variables |
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| 278 | #===================================================================== |
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| 279 | VARIABLES |
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| 280 | |
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| 281 | Tubes as Tube_Pdrop_Nozzles; |
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| 282 | Shell as Shell_Pdrop_Nozzles; |
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| 283 | |
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| 284 | end |
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| 285 | |
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| 286 | Model Baffles_Main |
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| 287 | #===================================================================== |
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| 288 | # Baffles Main Variables |
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| 289 | #===================================================================== |
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| 290 | VARIABLES |
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| 291 | Ls as length (Brief="Central Baffle Spacing",Lower=1e-8); |
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| 292 | Lsi as length (Brief="Inlet Baffle Spacing",Lower=1e-8); |
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| 293 | Lso as length (Brief="Outlet Baffle Spacing",Lower=1e-8); |
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| 294 | |
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| 295 | end |
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| 296 | |
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| 297 | Model Main_Resistances |
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| 298 | #===================================================================== |
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| 299 | # Resistances |
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| 300 | #===================================================================== |
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| 301 | VARIABLES |
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| 302 | |
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| 303 | Rtube as positive(Unit="m^2*K/kW",Lower=1e-6); |
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| 304 | Rwall as positive(Unit="m^2*K/kW",Lower=1e-6); |
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| 305 | Rshell as positive(Unit="m^2*K/kW",Lower=1e-6); |
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| 306 | #pctRtube as percent(Lower=1e-6); |
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| 307 | #pctRwall as percent(Lower=1e-6); |
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| 308 | #pctRshell as percent(Lower=1e-6); |
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| 309 | |
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| 310 | #EQUATIONS |
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| 311 | |
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| 312 | #pctRtube = 100*Rtube/(Rtube+Rwall+Rshell); |
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| 313 | #pctRwall = 100*Rwall/(Rtube+Rwall+Rshell); |
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| 314 | #pctRshell = 100*Rshell/(Rtube+Rwall+Rshell); |
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| 315 | |
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| 316 | end |
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| 317 | |
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| 318 | Model Details_Main |
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| 319 | #===================================================================== |
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| 320 | # Heat Exchanger Thermal Details |
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| 321 | #===================================================================== |
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| 322 | VARIABLES |
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| 323 | A as area (Brief="Exchange Surface Area"); |
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| 324 | Q as power (Brief="Heat Transfer", Default=7000, Lower=1e-6, Upper=1e10); |
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| 325 | U as heat_trans_coeff (Brief="Overall Heat Transfer Coefficient",Default=1,Lower=1e-6,Upper=1e10); |
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| 326 | Ch as positive (Brief="Hot Stream Heat Capacity",Lower=1e-3,Default=1e3,Unit="W/K"); |
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| 327 | Cc as positive (Brief="Cold Stream Heat Capacity",Lower=1e-3,Default=1e3,Unit="W/K"); |
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| 328 | Cr as positive (Default=0.5,Lower=1e-6); |
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| 329 | Cmin as positive (Brief="Minimum Heat Capacity",Lower=1e-10,Default=1e3,Unit="W/K"); |
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| 330 | Cmax as positive (Brief="Maximum Heat Capacity",Lower=1e-10,Default=1e3,Unit="W/K"); |
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| 331 | NTU as positive (Brief="Number of Units Transference",Default=0.05,Lower=1e-10); |
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| 332 | |
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| 333 | |
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| 334 | EQUATIONS |
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| 335 | |
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| 336 | "Number of Units Transference" |
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| 337 | NTU*Cmin = U*A; |
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| 338 | |
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| 339 | end |
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| 340 | |
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| 341 | Model Basic_Pdrop |
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| 342 | #===================================================================== |
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| 343 | # Pressure Drop |
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| 344 | #===================================================================== |
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| 345 | VARIABLES |
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| 346 | |
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| 347 | Pdrop as press_delta (Brief="Pressure Drop",Default=0.01, Lower=0); |
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| 348 | FPdrop as Real (Brief="Pressure Drop : Fraction of Inlet",Lower=0,Upper=0.8); |
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| 349 | |
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| 350 | end |
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| 351 | |
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| 352 | Model Main_Pdrop |
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| 353 | #===================================================================== |
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| 354 | # Pressure Drop block |
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| 355 | #===================================================================== |
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| 356 | VARIABLES |
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| 357 | Hot as Basic_Pdrop;# Hot Stream |
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| 358 | Cold as Basic_Pdrop;# Cold Stream |
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| 359 | |
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| 360 | end |
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| 361 | |
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