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 tanks |
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17 | *-------------------------------------------------------------------- |
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18 | * Streams: |
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19 | * * an inlet stream |
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20 | * * an outlet stream |
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21 | * |
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22 | * Specify: |
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23 | * * the Inlet stream |
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24 | * * the Outlet flow |
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25 | * * the tank Q |
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26 | * |
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27 | * Initial: |
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28 | * * the tank temperature (OutletL.T) |
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29 | * * the tank level (h) |
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30 | * * (NoComps - 1) Outlet compositions |
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31 | *---------------------------------------------------------------------- |
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32 | * Author: Paula B. Staudt |
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33 | * $Id: tank.mso 127 2007-01-23 18:21:08Z paula $ |
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34 | *--------------------------------------------------------------------*# |
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35 | |
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36 | using "streams"; |
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37 | |
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38 | Model tank |
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39 | |
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40 | PARAMETERS |
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41 | ext PP as CalcObject; |
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42 | ext NComp as Integer; |
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43 | Across as area (Brief="Tank cross section area", Default=2); |
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44 | |
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45 | VARIABLES |
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46 | in Inlet as stream; |
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47 | out Outlet as stream_therm; |
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48 | |
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49 | in Q as heat_rate (Brief="Rate of heat supply"); |
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50 | Level as length(Brief="Tank level"); |
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51 | M(NComp) as mol (Brief="Molar Holdup in the tank"); |
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52 | E as energy (Brief="Total Energy Holdup on tank"); |
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53 | vL as volume_mol (Brief="Liquid Molar Volume"); |
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54 | |
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55 | EQUATIONS |
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56 | "Mass balance" |
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57 | diff(M) = Inlet.F*Inlet.z - Outlet.F*Outlet.z; |
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58 | |
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59 | "Energy balance" |
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60 | diff(E) = Inlet.F*Inlet.h - Outlet.F*Outlet.h + Q; |
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61 | |
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62 | "Energy Holdup" |
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63 | E = sum(M)*Outlet.h; |
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64 | |
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65 | "Mechanical Equilibrium" |
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66 | Inlet.P = Outlet.P; |
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67 | |
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68 | "Liquid Volume" |
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69 | vL = PP.LiquidVolume(Outlet.T, Outlet.P, Outlet.z); |
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70 | |
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71 | "Composition" |
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72 | M = Outlet.z*sum(M); |
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73 | |
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74 | "Level of liquid phase" |
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75 | Level = sum(M)*vL/Across; |
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76 | |
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77 | "Vapourisation Fraction" |
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78 | Outlet.v = Inlet.v; |
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79 | end |
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80 | |
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81 | #*---------------------------------------------------------- |
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82 | * |
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83 | *Model of a tank with a lain cylinder geometry |
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84 | * |
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85 | *---------------------------------------------------------*# |
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86 | Model tank_cylindrical |
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87 | |
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88 | PARAMETERS |
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89 | ext PP as CalcObject; |
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90 | ext NComp as Integer; |
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91 | radius as length(Brief="Tank radius"); |
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92 | L as length(Brief="Tank length"); |
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93 | |
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94 | VARIABLES |
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95 | in Inlet as stream; |
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96 | out Outlet as stream_therm; |
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97 | |
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98 | in Q as heat_rate (Brief="Rate of heat supply"); |
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99 | Level as length(Brief="Tank level"); |
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100 | Across as area (Brief="Tank cross section area", Default=2); |
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101 | M(NComp) as mol (Brief="Molar Holdup in the tank"); |
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102 | E as energy (Brief="Total Energy Holdup on tank"); |
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103 | vL as volume_mol (Brief="Liquid Molar Volume"); |
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104 | |
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105 | EQUATIONS |
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106 | "Mass balance" |
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107 | diff(M) = Inlet.F*Inlet.z - Outlet.F*Outlet.z; |
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108 | |
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109 | "Energy balance" |
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110 | diff(E) = Inlet.F*Inlet.h - Outlet.F*Outlet.h + Q; |
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111 | |
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112 | "Energy Holdup" |
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113 | E = sum(M)*Outlet.h; |
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114 | |
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115 | "Mechanical Equilibrium" |
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116 | Inlet.P = Outlet.P; |
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117 | |
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118 | "Liquid Volume" |
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119 | vL = PP.LiquidVolume(Outlet.T, Outlet.P, Outlet.z); |
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120 | |
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121 | "Composition" |
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122 | M = Outlet.z*sum(M); |
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123 | |
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124 | "Cylindrical Area" |
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125 | Across = radius^2 * (asin(1) - asin((radius-Level)/radius) ) + |
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126 | (Level-radius)*sqrt(Level*(2*radius - Level)); |
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127 | |
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128 | "Level of liquid phase" |
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129 | L*Across = sum(M)*vL; |
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130 | |
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131 | "Vapourisation Fraction" |
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132 | Outlet.v = Inlet.v; |
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133 | end |
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134 | |
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135 | Model tank_simplified |
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136 | PARAMETERS |
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137 | k as Real (Brief="Valve Constant", Unit = "m^2.5/h", Default=4); |
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138 | A as area (Brief="Tank area", Default=2); |
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139 | |
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140 | VARIABLES |
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141 | h as length(Brief="Tank level"); |
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142 | in Fin as flow_vol(Brief="Input flow"); |
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143 | out Fout as flow_vol(Brief="Output flow"); |
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144 | |
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145 | EQUATIONS |
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146 | "Mass balance" |
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147 | diff(A*h) = Fin - Fout; |
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148 | |
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149 | "Valve equation" |
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150 | Fout = k*sqrt(h); |
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151 | end |
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152 | |
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153 | Model tank_feed |
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154 | |
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155 | PARAMETERS |
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156 | ext PP as CalcObject; |
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157 | ext NComp as Integer; |
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158 | Across as area (Brief="Tank cross section area", Default=2); |
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159 | |
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160 | VARIABLES |
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161 | in Feed as stream; |
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162 | in Inlet as stream; |
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163 | out Outlet as stream_therm; |
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164 | |
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165 | in Q as heat_rate (Brief="Rate of heat supply"); |
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166 | Level as length(Brief="Tank level"); |
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167 | M(NComp) as mol (Brief="Molar Holdup in the tank"); |
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168 | E as energy (Brief="Total Energy Holdup on tank"); |
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169 | vL as volume_mol (Brief="Liquid Molar Volume"); |
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170 | |
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171 | EQUATIONS |
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172 | "Mass balance" |
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173 | diff(M) = Feed.F*Feed.z + Inlet.F*Inlet.z - Outlet.F*Outlet.z; |
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174 | |
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175 | "Energy balance" |
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176 | diff(E) = Feed.F*Feed.h + Inlet.F*Inlet.h - Outlet.F*Outlet.h + Q; |
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177 | |
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178 | "Energy Holdup" |
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179 | E = sum(M)*Outlet.h; |
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180 | |
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181 | "Mechanical Equilibrium" |
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182 | Inlet.P = Outlet.P; |
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183 | |
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184 | "Liquid Volume" |
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185 | vL = PP.LiquidVolume(Outlet.T, Outlet.P, Outlet.z); |
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186 | |
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187 | "Composition" |
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188 | M = Outlet.z*sum(M); |
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189 | |
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190 | "Level of liquid phase" |
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191 | Level = sum(M)*vL/Across; |
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192 | |
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193 | "Vapourisation Fraction" |
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194 | Outlet.v = Inlet.v; |
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195 | |
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196 | end |
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