| 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 | * Author: Based on Models written by Paula B. Staudt |
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| 17 | * $Id$ |
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| 18 | *--------------------------------------------------------------------*# |
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| 19 | |
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| 20 | # The complete documentation for these models needs to be updated !!! |
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| 21 | |
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| 22 | using "streams"; |
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| 23 | |
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| 24 | Model User_trayBasic |
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| 25 | |
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| 26 | ATTRIBUTES |
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| 27 | Pallete = false; |
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| 28 | Icon = "icon/Tray"; |
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| 29 | Brief = "Basic description of a tray column model."; |
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| 30 | Info = |
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| 31 | "To be updated"; |
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| 32 | |
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| 33 | PARAMETERS |
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| 34 | outer PP as Plugin (Brief = "External Physical Properties", Type="PP"); |
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| 35 | outer NComp as Integer; |
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| 36 | |
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| 37 | VARIABLES |
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| 38 | |
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| 39 | Inlet as stream (Brief="Feed stream", PosX=0, PosY=0.4932, Hidden=true); |
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| 40 | LiquidSideStream as liquid_stream (Brief="liquid Sidestream", Hidden=true); |
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| 41 | VapourSideStream as vapour_stream (Brief="vapour Sidestream", Hidden=true); |
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| 42 | |
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| 43 | in InletL as stream (Brief="Inlet liquid stream", PosX=0.5195, PosY=0, Symbol="_{inL}"); |
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| 44 | in InletV as stream (Brief="Inlet vapour stream", PosX=0.4994, PosY=1, Symbol="_{inV}"); |
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| 45 | out OutletL as liquid_stream (Brief="Outlet liquid stream", PosX=0.8277, PosY=1, Symbol="_{outL}"); |
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| 46 | out OutletV as vapour_stream (Brief="Outlet vapour stream", PosX=0.8043, PosY=0, Symbol="_{outV}"); |
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| 47 | |
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| 48 | M(NComp) as mol (Brief="Molar Holdup in the tray"); |
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| 49 | ML as mol (Brief="Molar liquid holdup"); |
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| 50 | MV as mol (Brief="Molar vapour holdup"); |
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| 51 | E as energy (Brief="Total Energy Holdup on tray"); |
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| 52 | vL as volume_mol (Brief="Liquid Molar Volume"); |
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| 53 | vV as volume_mol (Brief="Vapour Molar volume"); |
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| 54 | Level as length (Brief="Height of clear liquid on plate"); |
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| 55 | yideal(NComp) as fraction; |
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| 56 | |
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| 57 | |
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| 58 | EQUATIONS |
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| 59 | |
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| 60 | "Component Molar Balance" |
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| 61 | diff(M)=Inlet.F*Inlet.z + InletL.F*InletL.z + InletV.F*InletV.z- OutletL.F*OutletL.z - OutletV.F*OutletV.z- |
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| 62 | LiquidSideStream.F*LiquidSideStream.z-VapourSideStream.F*VapourSideStream.z; |
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| 63 | |
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| 64 | "Molar Holdup" |
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| 65 | M = ML*OutletL.z + MV*OutletV.z; |
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| 66 | |
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| 67 | "Mol fraction normalisation" |
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| 68 | sum(OutletL.z)= 1.0; |
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| 69 | sum(OutletL.z)= sum(OutletV.z); |
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| 70 | |
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| 71 | "Liquid Volume" |
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| 72 | vL = PP.LiquidVolume(OutletL.T, OutletL.P, OutletL.z); |
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| 73 | |
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| 74 | "Vapour Volume" |
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| 75 | vV = PP.VapourVolume(OutletV.T, OutletV.P, OutletV.z); |
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| 76 | |
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| 77 | "Chemical Equilibrium" |
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| 78 | PP.LiquidFugacityCoefficient(OutletL.T, OutletL.P, OutletL.z)*OutletL.z = PP.VapourFugacityCoefficient(OutletV.T, OutletV.P, yideal)*yideal; |
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| 79 | |
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| 80 | "Thermal Equilibrium" |
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| 81 | OutletV.T = OutletL.T; |
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| 82 | |
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| 83 | "Mechanical Equilibrium" |
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| 84 | OutletV.P = OutletL.P; |
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| 85 | |
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| 86 | "Thermal Equilibrium Vapour Side Stream" |
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| 87 | OutletV.T = VapourSideStream.T; |
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| 88 | |
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| 89 | "Thermal Equilibrium Liquid Side Stream" |
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| 90 | OutletL.T = LiquidSideStream.T; |
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| 91 | |
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| 92 | "Mechanical Equilibrium Vapour Side Stream" |
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| 93 | OutletV.P= VapourSideStream.P; |
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| 94 | |
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| 95 | "Mechanical Equilibrium Liquid Side Stream" |
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| 96 | OutletL.P = LiquidSideStream.P; |
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| 97 | |
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| 98 | "Composition Liquid Side Stream" |
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| 99 | OutletL.z= LiquidSideStream.z; |
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| 100 | |
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| 101 | "Composition Vapour Side Stream" |
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| 102 | OutletV.z= VapourSideStream.z; |
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| 103 | |
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| 104 | end |
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| 105 | |
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| 106 | Model User_tray as User_trayBasic |
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| 107 | |
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| 108 | ATTRIBUTES |
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| 109 | Pallete = false; |
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| 110 | Icon = "icon/Tray"; |
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| 111 | Brief = "Description of a column tray."; |
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| 112 | Info = |
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| 113 | "To be updated"; |
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| 114 | |
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| 115 | VARIABLES |
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| 116 | rhoL as dens_mass; |
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| 117 | rhoV as dens_mass; |
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| 118 | |
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| 119 | btemp as Real (Brief="Temporary variable of Roffels liquid flow equation"); |
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| 120 | |
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| 121 | EQUATIONS |
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| 122 | |
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| 123 | "Liquid Density" |
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| 124 | rhoL = PP.LiquidDensity(OutletL.T, OutletL.P, OutletL.z); |
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| 125 | |
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| 126 | "Vapour Density" |
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| 127 | rhoV = PP.VapourDensity(InletV.T, InletV.P, InletV.z); |
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| 128 | |
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| 129 | end |
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| 130 | |
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