[57] | 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) 2002-2006 the author |
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| 6 | *----------------------------------------------------------------------------- |
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| 7 | * Author: Marcos L. Alencastro Date:03/03/2006 |
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| 8 | * $Id:$ Estefane da S. Horn |
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| 9 | *----------------------------------------------------------------------------- |
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| 10 | * -> Steady State |
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| 11 | * -> Only Vapour |
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| 12 | * -> Adiabatic |
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| 13 | *# |
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| 14 | |
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| 15 | using "streams"; |
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| 16 | using "pressure_changers/flux_machine_basic"; |
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| 17 | |
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| 18 | Model centrifugal_compressor as flux_machine_basic_TP |
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| 19 | |
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| 20 | PARAMETERS |
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| 21 | ext PP as CalcObject (Brief = "External Physical Properties"); |
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| 22 | ext NComp as Integer (Brief = "Number of chemical components", Lower = 1); |
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| 23 | Effs as positive (Default = 0.72, Brief = "Isentropic efficiency", Lower = 0, Upper = 1); |
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| 24 | R as positive (Default = 8.31451, Brief = "Constant of Gases", Unit= "kJ/kmol/K"); |
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| 25 | Mw(NComp) as molweight (Brief = "Molar Weight"); |
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| 26 | |
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| 27 | VARIABLES |
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| 28 | n as positive (Brief = "Politropic Coefficient"); |
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| 29 | k as positive (Brief = "Isentropic Coefficient"); |
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| 30 | Cp as cp_mol (Brief = "Heat Capacity", Unit = "kJ/(kmol*K)"); |
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| 31 | Cv as cv_mol (Brief = "Heat Capacity", Unit = "kJ/(kmol*K)"); |
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| 32 | Pdiff as press_delta (Brief = "Pressure Increase", Unit="kPa"); |
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| 33 | Pratio as positive (Brief = "Pressure Ratio"); |
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| 34 | Wp as energy_mol (Brief = "Politropic Head", Unit = "kJ/kmol"); |
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| 35 | Ws as energy_mol (Brief = "Isentropic Head", Unit = "kJ/kmol"); |
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| 36 | Tiso as temperature (Brief = "Isentropic Temperature"); |
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| 37 | Effp as positive (Brief = "Politropic efficiency", Lower = 0, Upper = 1); |
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| 38 | FPower as power (Brief = "Fluid Power", Unit="kW"); |
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| 39 | Mwm as molweight (Brief = "Mixture Molar Weight"); |
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| 40 | |
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| 41 | SET |
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| 42 | Mw = PP.MolecularWeight(); |
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| 43 | |
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| 44 | EQUATIONS |
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| 45 | |
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| 46 | "Calculate Mwm for Inlet Mixture" |
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| 47 | Mwm = sum(Mw([1:NComp])*Inlet.z([1:NComp])); |
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| 48 | |
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| 49 | "Calculate Outlet Stream Pressure" |
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| 50 | Outlet.P = Inlet.P + Pdiff; |
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| 51 | |
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| 52 | "Pratio Definition" |
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| 53 | Outlet.P = Inlet.P * Pratio; |
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| 54 | |
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| 55 | "Calculate Cp Using a External Physical Properties Routine" |
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| 56 | Cp = PP.VapourCp(Inlet.T,Inlet.P,Inlet.z); |
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| 57 | |
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| 58 | "Calculate Cv Using a External Physical Properties Routine" |
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| 59 | Cv = PP.VapourCv(Inlet.T,Inlet.P,Inlet.z); |
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| 60 | |
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| 61 | "Calculate Isentropic Coeficient" |
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| 62 | k = Cp/Cv; |
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| 63 | |
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| 64 | "Calculate Isentropic Head" |
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| 65 | Ws = (k/(k-1))*R*Inlet.T*((Outlet.P/Inlet.P)^((k-1)/k) - 1); |
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| 66 | |
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| 67 | "Calculate Isentropic Outlet Temperature" |
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| 68 | Tiso = Inlet.T * (Outlet.P/Inlet.P)^((k-1)/k); |
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| 69 | |
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| 70 | "Calculate Real Outlet Temperature" |
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| 71 | Effs * (Outlet.T- Inlet.T) = (Tiso - Inlet.T); |
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| 72 | |
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| 73 | "Calculate Politropic Coefficient" |
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| 74 | Outlet.T = Inlet.T * (Outlet.P/Inlet.P)^((n-1)/n); |
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| 75 | |
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| 76 | "Calculate Politropic Efficiency" |
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| 77 | Effp = (n/(n-1))/(k/(k-1)); |
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| 78 | |
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| 79 | "Calculate Politropic Head" |
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| 80 | Ws*Effp = Wp*Effs; |
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| 81 | |
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| 82 | "Calculate Fluid Power" |
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| 83 | FPower*Effs = Inlet.F*Ws; |
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| 84 | |
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| 85 | "Molar Balance" |
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| 86 | Outlet.F = Inlet.F; |
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| 87 | |
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| 88 | Outlet.z = Inlet.z; |
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| 89 | |
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| 90 | |
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| 91 | end |
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