| 1 | #*--------------------------------------------------------------------- |
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| 2 | * This file is property of the author and cannot be used, copyed |
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| 3 | * or modified without permission. |
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| 4 | * |
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| 5 | * Copyright (C) 2004-2006 the author |
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| 6 | * |
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| 7 | * |
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| 8 | * Multistream Heat Exchanger |
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| 9 | * Cocurrent and Counter Flow |
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| 10 | * |
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| 11 | *---------------------------------------------------------------------- |
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| 12 | * Author: Gerson Balbueno Bicca |
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| 13 | * $Id: Mheatex.mso 1 2006-06-20 17:33:53Z rafael $ |
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| 14 | *--------------------------------------------------------------------*# |
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| 15 | |
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| 16 | using "streams.mso"; |
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| 17 | |
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| 18 | Model Parameters |
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| 19 | #===================================================================== |
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| 20 | # Heat Exchanger Parameters |
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| 21 | #===================================================================== |
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| 22 | PARAMETERS |
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| 23 | |
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| 24 | ext PP as CalcObject; |
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| 25 | ext NComp as Integer (Brief="Number of Components"); |
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| 26 | ext Ncold as Integer (Brief="Number of Inlet Cold Streams",Lower=1,Default=1); |
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| 27 | ext Nhot as Integer (Brief="Number of Inlet Hot Streams",Lower=1,Default=1); |
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| 28 | |
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| 29 | end |
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| 30 | |
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| 31 | Model Inlet_Main_Stream as Parameters |
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| 32 | #===================================================================== |
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| 33 | # Inlet Streams |
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| 34 | #===================================================================== |
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| 35 | |
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| 36 | VARIABLES |
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| 37 | |
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| 38 | Hot(Nhot) as stream;# Inlet Hot Streams |
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| 39 | Cold(Ncold) as stream;# Inlet Cold Streams |
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| 40 | |
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| 41 | end |
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| 42 | |
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| 43 | Model Outlet_Main_Stream as Parameters |
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| 44 | #===================================================================== |
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| 45 | # Outlet Streams |
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| 46 | #===================================================================== |
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| 47 | |
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| 48 | VARIABLES |
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| 49 | |
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| 50 | Hot(Nhot) as stream_therm;# Outlet Hot Streams |
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| 51 | Cold(Ncold) as stream_therm;# Outlet Cold Streams |
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| 52 | |
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| 53 | end |
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| 54 | |
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| 55 | Model Mheatex |
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| 56 | #===================================================================== |
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| 57 | # Multistream Heat Exchanger Basic Calculation |
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| 58 | #===================================================================== |
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| 59 | PARAMETERS |
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| 60 | |
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| 61 | ext HE as CalcObject (Brief="Cold Box Calculations",File="Heatex.dll"); |
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| 62 | Side as Integer (Brief="Flow Direction",Lower=0,Upper=1); |
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| 63 | |
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| 64 | SET |
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| 65 | |
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| 66 | Side = HE.FlowDirection(); |
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| 67 | |
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| 68 | VARIABLES |
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| 69 | |
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| 70 | in Inlet as Inlet_Main_Stream; # Inlet Hot Streams |
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| 71 | out Outlet as Outlet_Main_Stream; # Outlet Hot Streams |
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| 72 | |
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| 73 | Q as power (Brief="Heat Transfer"); |
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| 74 | LMTD as temp_delta (Brief="Logarithmic Mean Temperature Difference"); |
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| 75 | UA as positive (Unit="W/K"); |
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| 76 | |
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| 77 | EQUATIONS |
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| 78 | |
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| 79 | "Hot Flow" |
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| 80 | Outlet.Hot.F = Inlet.Hot.F; |
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| 81 | |
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| 82 | "Cold Flow" |
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| 83 | Outlet.Cold.F = Inlet.Cold.F; |
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| 84 | |
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| 85 | "Hot Composition" |
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| 86 | Outlet.Hot.z = Inlet.Hot.z; |
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| 87 | |
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| 88 | "Cold Composition" |
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| 89 | Outlet.Cold.z = Inlet.Cold.z; |
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| 90 | |
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| 91 | "Vapourisation Fraction Hot Stream" |
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| 92 | Outlet.Hot.v = Inlet.Hot.v; |
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| 93 | |
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| 94 | "Vapourisation Fraction Cold Stream" |
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| 95 | Outlet.Cold.v = Inlet.Cold.v; |
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| 96 | |
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| 97 | "Heat Duty Hot Stream" |
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| 98 | Q = sum(Inlet.Hot.F*(Inlet.Hot.h- Outlet.Hot.h)); |
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| 99 | |
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| 100 | "Heat Duty Cold Stream" |
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| 101 | Q = -sum(Inlet.Cold.F*(Inlet.Cold.h- Outlet.Cold.h)); |
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| 102 | |
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| 103 | "Heat Duty" |
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| 104 | Q=UA*LMTD; |
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| 105 | |
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| 106 | #=================================================================== |
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| 107 | # Flow Direction |
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| 108 | #=================================================================== |
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| 109 | if Side equal 0 |
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| 110 | |
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| 111 | then |
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| 112 | #===================================================================== |
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| 113 | # Cocurrent Flow Multistream Heat Exchanger |
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| 114 | #=================================================================== |
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| 115 | "Cocurrent Flow LMTD" |
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| 116 | LMTD = HE.CocurrentLMTD(max(Inlet.Hot.T),min(Outlet.Hot.T),min(Inlet.Cold.T),max(Outlet.Cold.T)); |
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| 117 | |
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| 118 | else |
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| 119 | #===================================================================== |
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| 120 | # Counter Flow Multistream Heat Exchanger |
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| 121 | #===================================================================== |
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| 122 | "Counter Flow LMTD" |
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| 123 | LMTD = HE.CounterLMTD(max(Inlet.Hot.T),min(Outlet.Hot.T),max(Inlet.Cold.T),min(Outlet.Cold.T)); |
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| 124 | |
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| 125 | end |
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| 126 | |
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| 127 | end |
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