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 299 2007-07-04 20:02:35Z rafael $ |
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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; |
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38 | T as temperature; |
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39 | P as pressure; |
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40 | z(NComp) as fraction(Brief = "Overall Molar Fraction"); |
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41 | h as enth_mol; |
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42 | v as fraction(Brief = "Vapourisation 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"); |
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104 | y(NComp) as fraction(Brief = "Vapour Molar Fraction"); |
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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 | "Enthalpy" |
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110 | h = (1-v)*PP.LiquidEnthalpy(T, P, x) + |
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111 | v*PP.VapourEnthalpy(T, P, y); |
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112 | end |
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113 | |
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114 | Model source |
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115 | ATTRIBUTES |
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116 | Icon = "Source"; |
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117 | Brief = "Material stream source"; |
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118 | Info = " |
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119 | This model should be used for boundary streams. |
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120 | Usually these streams are known and come from another process |
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121 | units. |
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122 | |
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123 | The user should specify: |
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124 | * Total molar (mass or volumetric) flow |
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125 | * Temperature |
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126 | * Pressure |
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127 | * Molar (mass or volumetric) composition |
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128 | |
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129 | No matter the specification set, the model will calculate some |
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130 | additional properties: |
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131 | * Mass density |
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132 | * Mass flow |
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133 | * Mass compostions |
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134 | * Specific volume |
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135 | * Vapour fraction |
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136 | * Volumetric flow |
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137 | * Liquid and Vapour compositions |
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138 | "; |
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139 | |
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140 | PARAMETERS |
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141 | outer PP as Plugin (Brief = "External Physical Properties", Type="PP"); |
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142 | outer NComp as Integer (Brief = "Number of chemical components", Lower = 1); |
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143 | M(NComp) as molweight (Brief = "Component Mol Weight"); |
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144 | rhoModel as Switcher (Brief = "Density model", Valid = ["volume", "correlation"], Default="volume"); |
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145 | |
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146 | SET |
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147 | |
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148 | M = PP.MolecularWeight(); |
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149 | |
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150 | VARIABLES |
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151 | out Outlet as stream; |
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152 | x(NComp) as fraction (Brief = "Liquid Molar Fraction"); |
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153 | y(NComp) as fraction (Brief = "Vapour Molar Fraction"); |
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154 | hl as enth_mol; |
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155 | hv as enth_mol; |
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156 | zmass(NComp) as fraction (Brief = "Mass Fraction"); |
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157 | Mw as molweight (Brief = "Average Mol Weight"); |
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158 | vm as volume_mol (Brief = "Molar Volume"); |
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159 | rho as dens_mass (Brief = "Stream Mass Density"); |
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160 | rhom as dens_mol (Brief = "Stream Molar Density"); |
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161 | Fw as flow_mass (Brief = "Stream Mass Flow"); |
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162 | Fvol as flow_vol (Brief = "Volumetric Flow"); |
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163 | |
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164 | EQUATIONS |
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165 | "Flash Calculation" |
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166 | [Outlet.v, x, y] = PP.Flash(Outlet.T, Outlet.P, Outlet.z); |
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167 | |
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168 | "Overall Enthalpy" |
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169 | Outlet.h = (1-Outlet.v)*PP.LiquidEnthalpy(Outlet.T, Outlet.P, x) + |
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170 | Outlet.v*PP.VapourEnthalpy(Outlet.T, Outlet.P, y); |
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171 | |
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172 | hl = PP.LiquidEnthalpy(Outlet.T, Outlet.P, x); |
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173 | hv = PP.VapourEnthalpy(Outlet.T, Outlet.P, y); |
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174 | |
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175 | "Average Molecular Weight" |
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176 | Mw = sum(M*Outlet.z); |
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177 | |
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178 | switch rhoModel |
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179 | case "volume": |
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180 | "Molar Density" |
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181 | rhom * vm = 1; |
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182 | |
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183 | case "correlation": |
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184 | "Mass Density" |
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185 | rho*((1-Outlet.v)/PP.LiquidDensity(Outlet.T,Outlet.P,x) + Outlet.v/PP.VapourDensity(Outlet.T,Outlet.P,y)) = 1; |
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186 | end |
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187 | |
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188 | "Mass or Molar Density" |
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189 | rhom * Mw = rho; |
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190 | |
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191 | "Flow Mass" |
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192 | Fw = Mw*Outlet.F; |
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193 | |
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194 | "Molar Volume" |
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195 | vm = (1-Outlet.v)*PP.LiquidVolume(Outlet.T, Outlet.P, x) + Outlet.v*PP.VapourVolume(Outlet.T,Outlet.P,y); |
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196 | |
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197 | "Volumetric Flow" |
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198 | Fvol = Outlet.F*vm ; |
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199 | |
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200 | "Mass Fraction" |
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201 | zmass = M*Outlet.z / Mw; |
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202 | |
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203 | end |
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204 | |
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205 | Model sink |
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206 | ATTRIBUTES |
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207 | Icon = "Sink"; |
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208 | Brief = "Material stream sink"; |
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209 | Info = " |
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210 | This model should be used for boundary streams when additional |
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211 | information about the stream is desired. |
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212 | |
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213 | Some of the additional informations calculated by this models are: |
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214 | * Mass density |
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215 | * Mass flow |
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216 | * Mass compostions |
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217 | * Specific volume |
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218 | * Vapour fraction |
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219 | * Volumetric flow |
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220 | * Liquid and Vapour compositions |
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221 | "; |
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222 | |
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223 | PARAMETERS |
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224 | outer PP as Plugin (Brief = "External Physical Properties", Type="PP"); |
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225 | outer NComp as Integer (Brief = "Number of chemical components", Lower = 1); |
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226 | M(NComp) as molweight (Brief = "Component Mol Weight"); |
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227 | rhoModel as Switcher (Brief = "Density model", Valid = ["volume", "correlation"], Default="volume"); |
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228 | |
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229 | SET |
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230 | |
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231 | M = PP.MolecularWeight(); |
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232 | |
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233 | VARIABLES |
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234 | in Inlet as stream; |
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235 | v as fraction; |
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236 | x(NComp) as fraction (Brief = "Liquid Molar Fraction"); |
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237 | y(NComp) as fraction (Brief = "Vapour Molar Fraction"); |
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238 | zmass(NComp) as fraction (Brief = "Mass Fraction"); |
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239 | Mw as molweight (Brief = "Average Mol Weight"); |
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240 | vm as volume_mol (Brief = "Molar Volume"); |
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241 | rho as dens_mass (Brief = "Stream Mass Density"); |
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242 | rhom as dens_mol (Brief = "Stream Molar Density"); |
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243 | Fw as flow_mass (Brief = "Stream Mass Flow"); |
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244 | Fvol as flow_vol (Brief = "Volumetric Flow"); |
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245 | |
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246 | EQUATIONS |
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247 | "Flash Calculation" |
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248 | [v, x, y] = PP.FlashPH(Inlet.P, Inlet.h, Inlet.z); |
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249 | |
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250 | "Average Molecular Weight" |
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251 | Mw = sum(M*Inlet.z); |
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252 | |
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253 | switch rhoModel |
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254 | case "volume": |
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255 | "Molar Density" |
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256 | rhom * vm = 1; |
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257 | |
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258 | case "correlation": |
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259 | "Mass Density" |
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260 | rho * ((1-v)/PP.LiquidDensity(Inlet.T,Inlet.P,x) + v/PP.VapourDensity(Inlet.T,Inlet.P,y)) = 1; |
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261 | end |
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262 | |
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263 | "Mass or Molar Density" |
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264 | rhom * Mw = rho; |
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265 | |
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266 | "Flow Mass" |
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267 | Fw = Mw*Inlet.F; |
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268 | |
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269 | "Molar Volume" |
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270 | vm = (1-v)*PP.LiquidVolume(Inlet.T, Inlet.P, x) + v*PP.VapourVolume(Inlet.T,Inlet.P,y); |
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271 | |
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272 | "Volumetric Flow" |
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273 | Fvol = Inlet.F*vm ; |
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274 | |
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275 | "Mass Fraction" |
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276 | zmass = M*Inlet.z / Mw; |
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277 | |
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278 | end |
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279 | |
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280 | |
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281 | Model energy_source |
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282 | ATTRIBUTES |
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283 | Icon = "Source"; |
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284 | Brief = "Enegry stream source"; |
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285 | |
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286 | VARIABLES |
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287 | out Outlet as heat_rate; |
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288 | end |
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