| 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 | *--------------------------------------------------------------------- |
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| 17 | * Model of a Multistream Heat Exchanger |
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| 18 | * |
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| 19 | * Streams: |
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| 20 | * * Inlet(Ninlet) streams .... at least one material stream |
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| 21 | * * Outlet stream .... one material stream |
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| 22 | * |
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| 23 | * Purpose: |
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| 24 | * * Determines thermal and phase conditions of outlet stream |
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| 25 | * |
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| 26 | *---------------------------------------------------------------------- |
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| 27 | * Author: Gerson Balbueno Bicca |
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| 28 | * $Id: Mheatex.mso 78 2006-12-08 19:29:10Z paula $ |
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| 29 | *--------------------------------------------------------------------*# |
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| 30 | |
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| 31 | using "streams.mso"; |
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| 32 | |
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| 33 | Model Inlet_Main_Stream |
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| 34 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
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| 35 | # Inlet Streams |
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| 36 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
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| 37 | PARAMETERS |
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| 38 | |
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| 39 | Ncold as Integer (Brief="Number of Inlet Cold Streams",Lower=1); |
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| 40 | Nhot as Integer (Brief="Number of Inlet Hot Streams",Lower=1); |
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| 41 | |
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| 42 | VARIABLES |
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| 43 | |
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| 44 | Hot (Nhot) as stream;# Inlet Hot Streams |
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| 45 | Cold (Ncold) as stream;# Inlet Cold Streams |
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| 46 | |
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| 47 | end |
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| 48 | |
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| 49 | Model Outlet_Main_Stream |
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| 50 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
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| 51 | # Outlet Streams |
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| 52 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
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| 53 | PARAMETERS |
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| 54 | |
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| 55 | Ncold as Integer (Brief="Number of Inlet Cold Streams",Lower=1); |
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| 56 | Nhot as Integer (Brief="Number of Inlet Hot Streams",Lower=1); |
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| 57 | |
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| 58 | VARIABLES |
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| 59 | |
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| 60 | Hot (Nhot) as stream_therm;# Outlet Hot Streams |
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| 61 | Cold (Ncold) as stream_therm;# Outlet Cold Streams |
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| 62 | |
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| 63 | end |
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| 64 | |
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| 65 | Model Mheatex |
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| 66 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
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| 67 | # Multistream Heat Exchanger Basic Calculation |
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| 68 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
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| 69 | PARAMETERS |
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| 70 | |
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| 71 | ext PP as CalcObject (Brief="Physical Properties"); |
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| 72 | ext NComp as Integer (Brief="Number of Components"); |
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| 73 | HE as CalcObject (Brief="Cold Box Calculations",File="heatex"); |
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| 74 | Side as Integer (Brief="Flow Direction",Lower=0,Upper=1); |
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| 75 | Ncold as Integer (Brief="Number of Inlet Cold Streams",Lower=1); |
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| 76 | Nhot as Integer (Brief="Number of Inlet Hot Streams",Lower=1); |
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| 77 | |
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| 78 | VARIABLES |
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| 79 | |
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| 80 | in Inlet as Inlet_Main_Stream; # Inlet Hot Streams |
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| 81 | out Outlet as Outlet_Main_Stream; # Outlet Hot Streams |
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| 82 | |
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| 83 | Q as power (Brief="Heat Transfer"); |
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| 84 | LMTD as temp_delta (Brief="Logarithmic Mean Temperature Difference"); |
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| 85 | UA as positive (Unit="W/K"); |
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| 86 | |
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| 87 | SET |
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| 88 | |
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| 89 | Side = HE.FlowDir(); |
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| 90 | |
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| 91 | Inlet.Ncold = Ncold; |
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| 92 | Outlet.Ncold = Ncold; |
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| 93 | |
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| 94 | Inlet.Nhot = Nhot ; |
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| 95 | Outlet.Nhot = Nhot ; |
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| 96 | |
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| 97 | |
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| 98 | EQUATIONS |
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| 99 | |
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| 100 | "Hot Flow" |
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| 101 | Outlet.Hot.F = Inlet.Hot.F; |
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| 102 | |
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| 103 | "Cold Flow" |
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| 104 | Outlet.Cold.F = Inlet.Cold.F; |
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| 105 | |
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| 106 | "Hot Composition" |
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| 107 | Outlet.Hot.z = Inlet.Hot.z; |
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| 108 | |
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| 109 | "Cold Composition" |
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| 110 | Outlet.Cold.z = Inlet.Cold.z; |
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| 111 | |
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| 112 | "Vapourisation Fraction Hot Stream" |
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| 113 | Outlet.Hot.v = Inlet.Hot.v; |
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| 114 | |
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| 115 | "Vapourisation Fraction Cold Stream" |
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| 116 | Outlet.Cold.v = Inlet.Cold.v; |
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| 117 | |
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| 118 | "Heat Duty Hot Stream" |
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| 119 | Q = sum(Inlet.Hot.F*(Inlet.Hot.h- Outlet.Hot.h)); |
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| 120 | |
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| 121 | "Heat Duty Cold Stream" |
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| 122 | Q = -sum(Inlet.Cold.F*(Inlet.Cold.h- Outlet.Cold.h)); |
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| 123 | |
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| 124 | "Heat Duty" |
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| 125 | Q=UA*LMTD; |
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| 126 | |
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| 127 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
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| 128 | # Flow Direction |
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| 129 | #+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# |
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| 130 | |
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| 131 | if Side equal 0 |
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| 132 | |
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| 133 | then |
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| 134 | "Cocurrent Flow LMTD" |
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| 135 | LMTD = HE.CocurrentLMTD(max(Inlet.Hot.T),min(Outlet.Hot.T),min(Inlet.Cold.T),max(Outlet.Cold.T)); |
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| 136 | |
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| 137 | else |
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| 138 | "Counter Flow LMTD" |
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| 139 | LMTD = HE.CounterLMTD(max(Inlet.Hot.T),min(Outlet.Hot.T),max(Inlet.Cold.T),min(Outlet.Cold.T)); |
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| 140 | |
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| 141 | end |
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| 142 | |
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| 143 | end |
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