| 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 | * Author: Gerson Balbueno Bicca |
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| 16 | * $Id: Mheatex.mso 307 2007-07-05 01:54:54Z arge $ |
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| 17 | *--------------------------------------------------------------------*# |
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| 18 | |
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| 19 | using "HEX_Engine.mso"; |
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| 20 | |
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| 21 | Model Mheatex |
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| 22 | |
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| 23 | ATTRIBUTES |
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| 24 | Icon = "icon/Mheatex"; |
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| 25 | Pallete = true; |
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| 26 | Brief = "Model of a Multistream heat exchangers"; |
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| 27 | Info = |
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| 28 | "Heat Transfer between multiple hot and cold streams."; |
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| 29 | |
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| 30 | PARAMETERS |
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| 31 | |
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| 32 | outer PP as Plugin (Brief="Physical Properties", Type="PP"); |
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| 33 | outer NComp as Integer (Brief="Number of Components"); |
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| 34 | FlowDirection as Switcher(Brief="Flow Direction",Valid=["counter","cocurrent"],Default="cocurrent"); |
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| 35 | Ncold as Integer (Brief="Number of Inlet Cold Streams",Lower=1); |
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| 36 | Nhot as Integer (Brief="Number of Inlet Hot Streams",Lower=1); |
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| 37 | |
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| 38 | VARIABLES |
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| 39 | |
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| 40 | in InletHot(Nhot) as stream (Brief="Inlet Hot Streams"); |
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| 41 | out OutletHot(Nhot) as streamPH (Brief="Outlet Hot Streams"); |
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| 42 | in InletCold(Ncold) as stream (Brief="Inlet Cold Streams"); |
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| 43 | out OutletCold(Ncold) as streamPH (Brief="Outlet Cold Streams"); |
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| 44 | |
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| 45 | Method as LMTD_Basic (Brief="Log Mean Temperature Difference Method"); |
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| 46 | Q as power (Brief="Heat Transfer", Default=7000, Lower=1e-6, Upper=1e10); |
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| 47 | UA as Real (Brief="UA product",Unit='W/K',Lower=1e-8); |
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| 48 | |
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| 49 | EQUATIONS |
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| 50 | |
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| 51 | "Hot Flow" |
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| 52 | OutletHot.F = InletHot.F; |
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| 53 | |
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| 54 | "Cold Flow" |
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| 55 | OutletCold.F = InletCold.F; |
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| 56 | |
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| 57 | "Hot Composition" |
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| 58 | OutletHot.z = InletHot.z; |
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| 59 | |
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| 60 | "Cold Composition" |
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| 61 | OutletCold.z = InletCold.z; |
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| 62 | |
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| 63 | "Heat Duty Hot Stream" |
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| 64 | Q = sum(InletHot.F*(InletHot.h- OutletHot.h)); |
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| 65 | |
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| 66 | "Heat Duty Cold Stream" |
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| 67 | Q = -sum(InletCold.F*(InletCold.h- OutletCold.h)); |
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| 68 | |
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| 69 | "Heat Duty" |
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| 70 | Q = UA*Method.LMTD*Method.Fc; |
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| 71 | |
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| 72 | switch FlowDirection |
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| 73 | |
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| 74 | case "cocurrent": |
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| 75 | |
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| 76 | "Temperature Difference at Inlet" |
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| 77 | Method.DT0 = max(InletHot.T) - min(InletCold.T); |
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| 78 | |
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| 79 | "Temperature Difference at Outlet" |
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| 80 | Method.DTL = min(OutletHot.T) - max(OutletCold.T); |
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| 81 | |
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| 82 | case "counter": |
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| 83 | |
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| 84 | "Temperature Difference at Inlet" |
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| 85 | Method.DT0 = max(InletHot.T) - max(OutletCold.T); |
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| 86 | |
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| 87 | "Temperature Difference at Outlet" |
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| 88 | Method.DTL = min(OutletHot.T) - min(InletCold.T); |
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| 89 | |
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| 90 | end |
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| 91 | |
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| 92 | end |
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