[887] | 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 | * Model of basic streams |
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| 17 | *---------------------------------------------------------------------- |
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| 18 | * Author: Paula B. Staudt and Rafael de P. Soares |
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| 19 | * $Id: streams.mso 757 2009-06-03 20:07:22Z bicca $ |
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| 20 | *---------------------------------------------------------------------*# |
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| 21 | |
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| 22 | using "types"; |
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| 23 | |
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| 24 | Model stream |
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| 25 | ATTRIBUTES |
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| 26 | Pallete = false; |
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| 27 | Brief = "General Material Stream"; |
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| 28 | Info = |
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| 29 | "This is the basic building block for the EML models. |
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| 30 | Every model should have input and output streams derived |
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| 31 | from this model."; |
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| 32 | |
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| 33 | PARAMETERS |
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| 34 | outer NComp as Integer (Brief = "Number of chemical components", Lower = 1); |
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| 35 | |
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| 36 | VARIABLES |
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| 37 | F as flow_mol (Brief = "Stream Molar Flow Rate"); |
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| 38 | T as temperature (Brief = "Stream Temperature"); |
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| 39 | P as pressure (Brief = "Stream Pressure"); |
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| 40 | h as enth_mol (Brief = "Stream Enthalpy"); |
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| 41 | v as fraction (Brief = "Vapourization fraction"); |
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| 42 | z(NComp) as fraction (Brief = "Stream Molar Fraction"); |
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| 43 | end |
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| 44 | |
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| 45 | Model liquid_stream as stream |
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| 46 | ATTRIBUTES |
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| 47 | Pallete = false; |
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| 48 | Brief = "Liquid Material Stream"; |
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| 49 | Info = |
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| 50 | "Model for liquid material streams. |
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| 51 | This model should be used only when the phase of the stream |
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| 52 | is known ''a priori''."; |
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| 53 | |
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| 54 | PARAMETERS |
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| 55 | outer PP as Plugin(Brief = "External Physical Properties", Type="PP"); |
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| 56 | |
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| 57 | EQUATIONS |
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| 58 | "Liquid Enthalpy" |
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| 59 | h = PP.LiquidEnthalpy(T, P, z); |
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| 60 | "Liquid stream" |
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| 61 | v = 0; |
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| 62 | end |
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| 63 | |
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| 64 | Model vapour_stream as stream |
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| 65 | ATTRIBUTES |
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| 66 | Pallete = false; |
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| 67 | Brief = "Vapour Material Stream"; |
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| 68 | Info = |
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| 69 | "Model for vapour material streams. |
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| 70 | This model should be used only when the phase of the stream |
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| 71 | is known ''a priori''."; |
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| 72 | |
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| 73 | PARAMETERS |
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| 74 | outer PP as Plugin(Brief = "External Physical Properties", Type="PP"); |
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| 75 | |
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| 76 | EQUATIONS |
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| 77 | "Vapour Enthalpy" |
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| 78 | h = PP.VapourEnthalpy(T, P, z); |
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| 79 | "Vapour stream" |
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| 80 | v = 1; |
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| 81 | end |
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| 82 | |
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| 83 | Model streamPH as stream |
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| 84 | ATTRIBUTES |
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| 85 | Brief = "Stream with built-in flash calculation"; |
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| 86 | Info = " |
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| 87 | This model should be used when the vaporization fraction |
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| 88 | is unknown. |
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| 89 | |
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| 90 | The built-in flash calculation will determine the stream |
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| 91 | state as a function of the overall composition '''z''', the |
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| 92 | pressure '''P''' and the enthalpy '''h'''. |
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| 93 | |
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| 94 | Additionally, the liquid composition '''x''' and the vapor |
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| 95 | composition '''y''' are calculated. |
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| 96 | "; |
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| 97 | Pallete = false; |
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| 98 | |
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| 99 | PARAMETERS |
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| 100 | outer PP as Plugin(Brief = "External Physical Properties", Type="PP"); |
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| 101 | |
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| 102 | VARIABLES |
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| 103 | x(NComp) as fraction (Brief = "Liquid Molar Fraction",Hidden=true); |
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| 104 | y(NComp) as fraction (Brief = "Vapour Molar Fraction",Hidden=true); |
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| 105 | |
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| 106 | EQUATIONS |
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| 107 | "Flash Calculation" |
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| 108 | [v, x, y] = PP.FlashPH(P, h, z); |
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| 109 | |
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| 110 | "Enthalpy" |
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| 111 | h = (1-v)*PP.LiquidEnthalpy(T, P, x) + v*PP.VapourEnthalpy(T, P, y); |
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| 112 | |
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| 113 | end |
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| 114 | |
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| 115 | Model streamPHS as streamPH |
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| 116 | ATTRIBUTES |
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| 117 | Brief = "Stream with built-in flash calculation"; |
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| 118 | Info = " |
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| 119 | This model should be used when the vaporization fraction |
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| 120 | is unknown. |
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| 121 | |
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| 122 | The built-in flash calculation will determine the stream |
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| 123 | state as a function of the overall composition '''z''', the |
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| 124 | pressure '''P''' and the enthalpy '''h'''. |
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| 125 | |
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| 126 | Additionally, the liquid composition '''x''', the vapor |
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| 127 | composition '''y''' and the stream entropy are calculated. |
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| 128 | "; |
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| 129 | Pallete = false; |
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| 130 | |
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| 131 | PARAMETERS |
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| 132 | outer PP as Plugin(Brief = "External Physical Properties", Type="PP"); |
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| 133 | |
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| 134 | VARIABLES |
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| 135 | s as entr_mol (Brief = "Stream Entropy"); |
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| 136 | |
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| 137 | EQUATIONS |
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| 138 | |
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| 139 | "Entropy" |
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| 140 | s = (1-v)*PP.LiquidEntropy(T, P, x) + v*PP.VapourEntropy(T, P, y); |
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| 141 | |
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| 142 | end |
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| 143 | |
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