| 1 | #*------------------------------------------------------------------- |
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| 2 | * EMSO Model Library (EML) Copyright (C) 2004 - 2007 ALSOC. |
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| 3 | * |
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| 4 | * This LIBRARY is free software; you can distribute it and/or modify |
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| 5 | * it under the therms of the ALSOC FREE LICENSE as available at |
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| 6 | * http://www.enq.ufrgs.br/alsoc. |
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| 7 | * |
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| 8 | * EMSO Copyright (C) 2004 - 2007 ALSOC, original code |
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| 9 | * from http://www.rps.eng.br Copyright (C) 2002-2004. |
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| 10 | * All rights reserved. |
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| 11 | * |
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| 12 | * EMSO is distributed under the therms of the ALSOC LICENSE as |
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| 13 | * available at http://www.enq.ufrgs.br/alsoc. |
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| 14 | * |
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| 15 | *--------------------------------------------------------------------* |
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| 16 | * Heat Exchangers Abstract Models for composition |
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| 17 | *-------------------------------------------------------------------- |
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| 18 | * Author: Gerson Balbueno Bicca |
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| 19 | * $Id: HEX_Engine.mso 261 2007-06-15 22:12:30Z bicca $ |
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| 20 | *--------------------------------------------------------------------*# |
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| 21 | |
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| 22 | using "streams"; |
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| 23 | |
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| 24 | Model Properties_Average |
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| 25 | |
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| 26 | ATTRIBUTES |
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| 27 | Pallete = false; |
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| 28 | Brief = "Average physical properties of the streams."; |
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| 29 | Info = |
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| 30 | "write some information"; |
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| 31 | |
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| 32 | VARIABLES |
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| 33 | Mw as molweight (Brief="Average Mol Weight",Default=75, Lower=1, Upper=1e8); |
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| 34 | T as temperature (Brief="Average Temperature",Lower=50); |
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| 35 | P as pressure (Brief="Average Pressure",Default=1, Lower=1e-10, Upper=30,DisplayUnit='kPa'); |
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| 36 | rho as dens_mass (Brief="Stream Density" ,Default=1000, Lower=1e-3, Upper=5e5); |
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| 37 | Mu as viscosity (Brief="Stream Viscosity",Lower=0.0001); |
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| 38 | Cp as cp_mol (Brief="Stream Molar Heat Capacity", Upper=1e10); |
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| 39 | K as conductivity (Brief="Stream Thermal Conductivity", Default=1.0, Lower=1e-5, Upper=500); |
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| 40 | |
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| 41 | end |
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| 42 | |
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| 43 | Model Properties_In_Out |
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| 44 | |
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| 45 | ATTRIBUTES |
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| 46 | Pallete = false; |
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| 47 | Brief = "Inlet and outlet physical properties of the streams."; |
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| 48 | Info = |
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| 49 | "write some information"; |
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| 50 | |
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| 51 | VARIABLES |
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| 52 | Fw as flow_mass (Brief="Stream Mass Flow"); |
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| 53 | rho as dens_mass (Brief="Stream Density" ,Default=1000, Lower=1e-3, Upper=5e5); |
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| 54 | Mu as viscosity (Brief="Stream Viscosity",Default=1, Lower=1e-5, Upper=1e5); |
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| 55 | Cp as cp_mol (Brief="Stream Molar Heat Capacity", Upper=1e10); |
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| 56 | K as conductivity (Brief="Stream Thermal Conductivity", Default=1.0, Lower=1e-5, Upper=500); |
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| 57 | |
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| 58 | end |
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| 59 | |
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| 60 | Model Properties_Wall |
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| 61 | |
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| 62 | ATTRIBUTES |
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| 63 | Pallete = false; |
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| 64 | Brief = "Physical properties of the streams at wall temperature."; |
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| 65 | Info = |
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| 66 | "write some information"; |
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| 67 | |
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| 68 | VARIABLES |
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| 69 | |
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| 70 | Mu as viscosity (Brief="Stream Viscosity",Default=1, Lower=1e-5, Upper=1e5); |
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| 71 | Twall as temperature (Brief="Wall Temperature",Lower=50); |
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| 72 | |
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| 73 | end |
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| 74 | |
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| 75 | Model Physical_Properties |
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| 76 | |
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| 77 | ATTRIBUTES |
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| 78 | Pallete = false; |
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| 79 | Brief = "write some information"; |
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| 80 | Info = |
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| 81 | "write some information"; |
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| 82 | |
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| 83 | VARIABLES |
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| 84 | |
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| 85 | Inlet as Properties_In_Out (Brief="Properties at Inlet Stream"); |
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| 86 | Average as Properties_Average (Brief="Properties at Average Temperature"); |
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| 87 | Outlet as Properties_In_Out (Brief="Properties at Outlet Stream"); |
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| 88 | Wall as Properties_Wall (Brief="Properties at Wall Temperature"); |
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| 89 | |
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| 90 | end |
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| 91 | |
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| 92 | Model Tube_Pdrop |
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| 93 | |
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| 94 | ATTRIBUTES |
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| 95 | Pallete = false; |
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| 96 | Brief = "write some information"; |
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| 97 | Info = |
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| 98 | "write some information"; |
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| 99 | |
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| 100 | VARIABLES |
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| 101 | PdTube as press_delta (Brief="Tube Pressure Drop",Default=0.01, Lower=1e-10,DisplayUnit='kPa'); |
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| 102 | Pdtotal as press_delta (Brief="Total Pressure Drop",Default=0.01, Lower=1e-10,DisplayUnit='kPa'); |
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| 103 | Pdnozzle_in as press_delta (Brief="Inlet Nozzle Pressure Drop",Default=0.01, Lower=0,DisplayUnit='kPa'); |
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| 104 | Pdnozzle_out as press_delta (Brief="Outlet Nozzle Pressure Drop",Default=0.01, Lower=0,DisplayUnit='kPa'); |
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| 105 | Vnozzle_in as velocity (Brief="Inlet Nozzle Velocity",Default=1, Upper=1e5, Lower=0); |
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| 106 | Vnozzle_out as velocity (Brief="Outlet Nozzle Velocity",Default=1, Upper=1e5, Lower=0); |
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| 107 | fi as fricfactor (Brief="Friction Factor", Default=0.05, Lower=1e-10, Upper=2000); |
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| 108 | |
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| 109 | EQUATIONS |
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| 110 | "Total Pressure Drop" |
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| 111 | Pdtotal = PdTube + Pdnozzle_in + Pdnozzle_out; |
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| 112 | |
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| 113 | end |
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| 114 | |
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| 115 | Model Tube_Heat_Transfer |
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| 116 | |
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| 117 | ATTRIBUTES |
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| 118 | Pallete = false; |
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| 119 | Brief = "write some information"; |
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| 120 | Info = |
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| 121 | "write some information"; |
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| 122 | |
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| 123 | VARIABLES |
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| 124 | Re as positive (Brief="Tube Side Reynolds Number",Default=1000,Lower=1); |
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| 125 | Nu as positive (Brief="Nusselt Number",Default=0.5,Lower=1e-8); |
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| 126 | htube as heat_trans_coeff (Brief="Tube Side Film Coefficient",Default=1,Lower=1e-12, Upper=1e6); |
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| 127 | fi as fricfactor (Brief="Friction Factor", Default=0.05, Lower=1e-10, Upper=2000); |
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| 128 | PR as positive (Brief="Tube Side Prandtl Number",Default=0.5,Lower=1e-8); |
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| 129 | Phi as positive (Brief="Phi Correction",Default=1,Lower=1e-3); |
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| 130 | Vtube as velocity (Brief="Tube Side Velocity",Lower=1e-8); |
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| 131 | |
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| 132 | end |
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| 133 | |
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| 134 | Model Shell_Pdrop |
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| 135 | |
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| 136 | ATTRIBUTES |
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| 137 | Pallete = false; |
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| 138 | Brief = "write some information"; |
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| 139 | Info = |
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| 140 | "write some information"; |
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| 141 | |
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| 142 | VARIABLES |
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| 143 | Pideal as press_delta (Brief="Ideal Pressure Drop",Default=0.01, Lower=0,DisplayUnit='kPa'); |
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| 144 | PdCross as press_delta (Brief="Cross Flow Pressure Drop",Default=0.01, Lower=0,DisplayUnit='kPa'); |
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| 145 | PdEndZones as press_delta (Brief="End Zones Pressure Drop",Default=0.01, Lower=0,DisplayUnit='kPa'); |
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| 146 | Pdwindow as press_delta (Brief="Window Pressure Drop",Default=0.01, Lower=1e-10,DisplayUnit='kPa'); |
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| 147 | Pdtotal as press_delta (Brief="Total Pressure Drop",Default=0.01, Lower=0,DisplayUnit='kPa'); |
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| 148 | Pdnozzle_in as press_delta (Brief="Inlet Nozzle Pressure Drop",Default=0.01, Lower=0,DisplayUnit='kPa'); |
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| 149 | Pdnozzle_out as press_delta (Brief="Outlet Nozzle Pressure Drop",Default=0.01, Lower=0,DisplayUnit='kPa'); |
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| 150 | fi as fricfactor (Brief="Friction Factor", Default=0.05, Lower=1e-10, Upper=2000); |
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| 151 | Vnozzle_in as velocity (Brief="Inlet Nozzle Velocity",Default=1, Upper=1e5, Lower=0); |
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| 152 | Vnozzle_out as velocity (Brief="Outlet Nozzle Velocity",Default=1, Upper=1e5, Lower=0); |
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| 153 | RVsquare_out as positive (Brief = "Outlet Nozzle rho-V^2", Default=1, Upper=1e6, Unit = 'kg/s^2/m'); |
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| 154 | RVsquare_in as positive (Brief = "Inlet Nozzle rho-V^2", Default=1, Upper=1e6, Unit = 'kg/s^2/m'); |
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| 155 | |
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| 156 | EQUATIONS |
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| 157 | "Shell Side Total Pressure Drop" |
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| 158 | Pdtotal = PdCross + PdEndZones + Pdnozzle_in + Pdnozzle_out + Pdwindow; |
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| 159 | |
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| 160 | end |
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| 161 | |
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| 162 | Model Shell_Heat_Transfer |
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| 163 | |
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| 164 | ATTRIBUTES |
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| 165 | Pallete = false; |
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| 166 | Brief = "write some information"; |
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| 167 | Info = |
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| 168 | "write some information"; |
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| 169 | |
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| 170 | VARIABLES |
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| 171 | Re as positive (Brief="Shell Side Reynolds Number",Default=100,Lower=1); |
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| 172 | PR as positive (Brief="Shell Side Prandtl Number",Default=0.7,Lower=1e-6); |
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| 173 | hshell as heat_trans_coeff (Brief="Shell Side Film Coefficient",Default=1,Lower=1e-12, Upper=1e6); |
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| 174 | Phi as positive (Brief="Phi Correction",Default=1,Lower=1e-3); |
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| 175 | Ji as constant (Brief="Shell Side Ji Factor",Default=0.05); |
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| 176 | Jr as positive (Brief="Shell Side Jr Factor",Lower=10e-6); |
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| 177 | Jl as positive (Brief="Shell Side Jl Factor",Lower=10e-6); |
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| 178 | Jb as positive (Brief="Shell Side Jb Factor",Lower=10e-6); |
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| 179 | Jc as positive (Brief="Shell Side Jc Factor",Lower=10e-6); |
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| 180 | Js as positive (Brief="Shell Side Js Factor",Lower=10e-6); |
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| 181 | Jtotal as positive (Brief="Shell Side Jtotal Factor",Lower=10e-6); |
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| 182 | Sm as area (Brief="Shell Side Cross Flow Area",Default=0.05,Lower=10e-6); |
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| 183 | |
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| 184 | end |
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| 185 | |
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| 186 | Model Baffles_Main |
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| 187 | |
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| 188 | ATTRIBUTES |
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| 189 | Pallete = false; |
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| 190 | Brief = "write some information"; |
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| 191 | Info = |
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| 192 | "write some information"; |
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| 193 | |
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| 194 | VARIABLES |
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| 195 | Ls as length (Brief="Central Baffle Spacing",Lower=1e-8); |
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| 196 | Lsi as length (Brief="Inlet Baffle Spacing",Lower=1e-8); |
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| 197 | Lso as length (Brief="Outlet Baffle Spacing",Lower=1e-8); |
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| 198 | |
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| 199 | end |
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| 200 | |
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| 201 | Model NTU_Basic |
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| 202 | |
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| 203 | ATTRIBUTES |
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| 204 | Pallete = false; |
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| 205 | Brief = "Number of Units Transference Method."; |
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| 206 | Info = |
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| 207 | "write some information"; |
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| 208 | |
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| 209 | VARIABLES |
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| 210 | |
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| 211 | Ch as positive (Brief="Hot Stream Heat Capacity",Lower=1e-3,Default=1e3,Unit='W/K'); |
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| 212 | Cc as positive (Brief="Cold Stream Heat Capacity",Lower=1e-3,Default=1e3,Unit='W/K'); |
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| 213 | Cr as positive (Brief="Heat Capacity Ratio",Default=0.5,Lower=1e-6); |
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| 214 | Cmin as positive (Brief="Minimum Heat Capacity",Lower=1e-10,Default=1e3,Unit='W/K'); |
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| 215 | Cmax as positive (Brief="Maximum Heat Capacity",Lower=1e-10,Default=1e3,Unit='W/K'); |
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| 216 | NTU as positive (Brief="Number of Units Transference",Default=0.05,Lower=1e-10); |
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| 217 | Eft as positive (Brief="Effectiveness",Default=0.5,Lower=1e-8,Upper=1); |
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| 218 | Eft1 as positive (Brief="Effectiveness Correction",Lower=1e-8,Default=0.5); |
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| 219 | |
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| 220 | end |
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| 221 | |
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| 222 | Model LMTD_Basic |
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| 223 | |
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| 224 | ATTRIBUTES |
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| 225 | Pallete = false; |
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| 226 | Brief = "Log Mean Temperature Difference Method."; |
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| 227 | Info = |
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| 228 | "write some information"; |
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| 229 | |
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| 230 | VARIABLES |
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| 231 | |
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| 232 | DT0 as temp_delta (Brief="Temperature Difference at Inlet",Lower=1); |
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| 233 | DTL as temp_delta (Brief="Temperature Difference at Outlet",Lower=1); |
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| 234 | LMTD as temp_delta (Brief="Logarithmic Mean Temperature Difference",Lower=1); |
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| 235 | Fc as positive (Brief="LMTD Correction Factor",Lower=0.1); |
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| 236 | |
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| 237 | EQUATIONS |
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| 238 | |
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| 239 | if abs(DT0 - DTL) > 0.05*max(abs([DT0,DTL])) |
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| 240 | |
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| 241 | then |
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| 242 | "Log Mean Temperature Difference" |
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| 243 | LMTD= (DT0-DTL)/ln(DT0/DTL); |
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| 244 | |
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| 245 | else |
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| 246 | |
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| 247 | if DT0*DTL equal 0 |
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| 248 | |
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| 249 | then |
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| 250 | "Log Mean Temperature Difference" |
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| 251 | LMTD = 0.5*(DT0+DTL); |
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| 252 | |
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| 253 | else |
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| 254 | "Log Mean Temperature Difference" |
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| 255 | LMTD = 0.5*(DT0+DTL)*(1-(DT0-DTL)^2/(DT0*DTL)*(1+(DT0-DTL)^2/(DT0*DTL)/2)/12); |
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| 256 | |
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| 257 | end |
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| 258 | |
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| 259 | end |
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| 260 | |
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| 261 | end |
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| 262 | |
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| 263 | Model Details_Main |
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| 264 | |
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| 265 | ATTRIBUTES |
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| 266 | Pallete = false; |
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| 267 | Brief = "write some information"; |
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| 268 | Info = |
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| 269 | "write some information"; |
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| 270 | |
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| 271 | VARIABLES |
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| 272 | A as area (Brief="Exchange Surface Area"); |
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| 273 | Q as power (Brief="Heat Transfer", Default=7000, Lower=1e-6, Upper=1e10); |
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| 274 | Uc as heat_trans_coeff (Brief="Overall Heat Transfer Coefficient Clean",Default=1,Lower=1e-6,Upper=1e10); |
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| 275 | Ud as heat_trans_coeff (Brief="Overall Heat Transfer Coefficient Dirty",Default=1,Lower=1e-6,Upper=1e10); |
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| 276 | |
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| 277 | end |
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| 278 | |
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| 279 | Model Tube_Side_Main |
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| 280 | |
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| 281 | ATTRIBUTES |
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| 282 | Pallete = false; |
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| 283 | Brief = "write some information"; |
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| 284 | Info = |
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| 285 | "write some information"; |
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| 286 | |
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| 287 | VARIABLES |
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| 288 | PressureDrop as Tube_Pdrop (Brief="Tube Side Pressure Drop"); |
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| 289 | HeatTransfer as Tube_Heat_Transfer (Brief="Tube Side Heat Transfer"); |
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| 290 | Properties as Physical_Properties (Brief="Tube Side Properties"); |
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| 291 | |
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| 292 | end |
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| 293 | |
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| 294 | Model Shell_Side_Main |
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| 295 | |
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| 296 | ATTRIBUTES |
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| 297 | Pallete = false; |
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| 298 | Brief = "write some information"; |
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| 299 | Info = |
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| 300 | "write some information"; |
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| 301 | |
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| 302 | VARIABLES |
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| 303 | PressureDrop as Shell_Pdrop (Brief="Shell Side Pressure Drop"); |
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| 304 | HeatTransfer as Shell_Heat_Transfer (Brief= "Shell Side Heat Transfer"); |
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| 305 | Properties as Physical_Properties (Brief="ShellSide Properties"); |
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| 306 | |
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| 307 | end |
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| 308 | |
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| 309 | Model Basic_Pdrop |
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| 310 | |
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| 311 | ATTRIBUTES |
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| 312 | Pallete = false; |
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| 313 | Brief = "write some information"; |
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| 314 | Info = |
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| 315 | "write some information"; |
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| 316 | |
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| 317 | VARIABLES |
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| 318 | |
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| 319 | Pdrop as press_delta (Brief="Pressure Drop",Default=0.01, Lower=0,DisplayUnit='kPa'); |
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| 320 | FPdrop as Real (Brief="Pressure Drop : Fraction of Inlet",Lower=0,Upper=0.8); |
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| 321 | |
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| 322 | end |
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| 323 | |
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| 324 | Model DoublePipe_HeatTransfer |
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| 325 | |
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| 326 | ATTRIBUTES |
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| 327 | Pallete = false; |
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| 328 | Brief = "write some information"; |
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| 329 | Info = |
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| 330 | "write some information"; |
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| 331 | |
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| 332 | PARAMETERS |
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| 333 | As as area (Brief="Cross Sectional Area for Flow",Default=0.05,Lower=1e-8); |
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| 334 | Dh as length (Brief="Hydraulic Diameter of Pipe for Heat Transfer",Lower=1e-8); |
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| 335 | |
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| 336 | VARIABLES |
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| 337 | Re as positive (Brief="Reynolds Number",Default=100,Lower=1); |
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| 338 | hcoeff as heat_trans_coeff (Brief="Film Coefficient",Default=1,Lower=1e-12, Upper=1e6); |
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| 339 | fi as fricfactor (Brief="Friction Factor", Default=0.05, Lower=1e-10, Upper=2000); |
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| 340 | Nu as positive (Brief="Nusselt Number",Default=0.5,Lower=1e-8); |
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| 341 | PR as positive (Brief="Prandtl Number",Default=0.5,Lower=1e-8); |
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| 342 | Phi as positive (Brief="Phi Correction",Default=1,Lower=1e-3); |
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| 343 | Vmean as velocity (Brief="Tube Velocity",Lower=1e-8); |
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| 344 | |
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| 345 | end |
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| 346 | |
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| 347 | Model DoublePipe_PressureDrop |
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| 348 | |
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| 349 | ATTRIBUTES |
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| 350 | Pallete = false; |
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| 351 | Brief = "write some information"; |
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| 352 | Info = |
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| 353 | "write some information"; |
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| 354 | |
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| 355 | PARAMETERS |
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| 356 | |
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| 357 | Dh as length (Brief="Hydraulic Diameter of Pipe for Pressure Drop",Lower=1e-6); |
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| 358 | |
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| 359 | VARIABLES |
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| 360 | |
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| 361 | Pdrop as press_delta (Brief="Pressure Drop",Default=0.01, Lower=1e-10,DisplayUnit='kPa'); |
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| 362 | fi as fricfactor (Brief="Friction Factor", Default=0.05, Lower=1e-10, Upper=2000); |
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| 363 | Re as positive (Brief="Reynolds Number",Default=100,Lower=1); |
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| 364 | |
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| 365 | end |
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| 366 | |
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| 367 | Model Main_DoublePipe |
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| 368 | |
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| 369 | ATTRIBUTES |
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| 370 | Pallete = false; |
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| 371 | Brief = "write some information"; |
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| 372 | Info = |
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| 373 | "write some information"; |
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| 374 | |
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| 375 | VARIABLES |
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| 376 | |
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| 377 | HeatTransfer as DoublePipe_HeatTransfer (Brief="Double Pipe Heat Transfer"); |
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| 378 | PressureDrop as DoublePipe_PressureDrop (Brief="Double Pipe Pressure Drop"); |
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| 379 | Properties as Physical_Properties (Brief="Double Pipe Properties"); |
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| 380 | |
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| 381 | end |
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| 382 | |
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| 383 | Model Main_Simplified |
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| 384 | |
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| 385 | ATTRIBUTES |
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| 386 | Pallete = false; |
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| 387 | Brief = "write some information"; |
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| 388 | Info = |
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| 389 | "write some information"; |
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| 390 | |
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| 391 | VARIABLES |
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| 392 | |
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| 393 | PressureDrop as Basic_Pdrop (Brief="Pressure Drop"); |
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| 394 | Properties as Physical_Properties (Brief="Physical Properties"); |
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| 395 | |
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| 396 | end |
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| 397 | |
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| 398 | Model PHE_HeatTransfer |
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| 399 | |
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| 400 | ATTRIBUTES |
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| 401 | Pallete = false; |
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| 402 | Brief = "write some information"; |
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| 403 | Info = |
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| 404 | "write some information"; |
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| 405 | |
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| 406 | VARIABLES |
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| 407 | |
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| 408 | Re as positive (Brief="Reynolds Number",Default=100,Lower=1); |
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| 409 | PR as positive (Brief="Prandtl Number",Default=0.5,Lower=1e-8); |
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| 410 | NTU as positive (Brief="Number of Units Transference",Default=0.05,Lower=1e-10); |
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| 411 | WCp as positive (Brief="Stream Heat Capacity",Lower=1e-3,Default=1e3,Unit='W/K'); |
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| 412 | hcoeff as heat_trans_coeff (Brief="Film Coefficient",Default=1,Lower=1e-12, Upper=1e6); |
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| 413 | Gchannel as flux_mass (Brief ="Channel Mass Flux", Default=1, Lower=1e-6); |
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| 414 | Gports as flux_mass (Brief ="Ports Mass Flux", Default=1, Lower=1e-6); |
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| 415 | Phi as positive (Brief="Viscosity Correction",Default=1,Lower=1e-3); |
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| 416 | |
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| 417 | end |
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| 418 | |
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| 419 | Model PHE_PressureDrop |
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| 420 | |
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| 421 | ATTRIBUTES |
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| 422 | Pallete = false; |
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| 423 | Brief = "write some information"; |
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| 424 | Info = |
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| 425 | "write some information"; |
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| 426 | |
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| 427 | VARIABLES |
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| 428 | |
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| 429 | DPchannel as press_delta (Brief="Channel Pressure Drop",Default=0.01, Lower=1e-10,DisplayUnit='kPa'); |
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| 430 | DPports as press_delta (Brief="Ports Pressure Drop",Default=0.01, Lower=1e-10,DisplayUnit='kPa'); |
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| 431 | Pdrop as press_delta (Brief="Total Pressure Drop",Default=0.01, Lower=1e-10,DisplayUnit='kPa'); |
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| 432 | fi as fricfactor (Brief="Friction Factor", Default=0.05, Lower=1e-10, Upper=2000); |
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| 433 | Vchannel as velocity (Brief="Stream Velocity in Channel",Lower=1e-8); |
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| 434 | Vports as velocity (Brief="Stream Velocity in Ports",Lower=1e-8); |
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| 435 | Npassage as Real (Brief="Number of Channels per Pass"); |
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| 436 | end |
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| 437 | |
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| 438 | Model Main_PHE |
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| 439 | |
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| 440 | ATTRIBUTES |
|---|
| 441 | Pallete = false; |
|---|
| 442 | Brief = "write some information"; |
|---|
| 443 | Info = |
|---|
| 444 | "write some information"; |
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| 445 | |
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| 446 | VARIABLES |
|---|
| 447 | |
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| 448 | HeatTransfer as PHE_HeatTransfer (Brief="PHE Heat Transfer"); |
|---|
| 449 | PressureDrop as PHE_PressureDrop (Brief="PHE Pressure Drop"); |
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| 450 | Properties as Physical_Properties (Brief="PHE Properties"); |
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| 451 | |
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| 452 | end |
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| 453 | |
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| 454 | Model Thermal_PHE as LMTD_Basic |
|---|
| 455 | |
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| 456 | ATTRIBUTES |
|---|
| 457 | Pallete = false; |
|---|
| 458 | Brief = "write some information"; |
|---|
| 459 | Info = |
|---|
| 460 | "write some information"; |
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| 461 | |
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| 462 | VARIABLES |
|---|
| 463 | Cr as positive (Brief="Heat Capacity Ratio",Default=0.5,Lower=1e-6); |
|---|
| 464 | Cmin as positive (Brief="Minimum Heat Capacity",Lower=1e-10,Default=1e3,Unit='W/K'); |
|---|
| 465 | Cmax as positive (Brief="Maximum Heat Capacity",Lower=1e-10,Default=1e3,Unit='W/K'); |
|---|
| 466 | NTU as positive (Brief="Number of Units Transference",Default=0.05,Lower=1e-10); |
|---|
| 467 | Eft as positive (Brief="Effectiveness",Default=0.5,Lower=1e-8,Upper=1); |
|---|
| 468 | Q as power (Brief="Heat Transfer", Default=7000, Lower=1e-6, Upper=1e10); |
|---|
| 469 | Uc as heat_trans_coeff (Brief="Overall Heat Transfer Coefficient Clean",Default=1,Lower=1e-6,Upper=1e10); |
|---|
| 470 | Ud as heat_trans_coeff (Brief="Overall Heat Transfer Coefficient Dirty",Default=1,Lower=1e-6,Upper=1e10); |
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| 471 | end |
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