| 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 | * Author: Andrey Copat, Estefane S. Horn, Marcos L. Alencastro (Revised Gerson B. Bicca) |
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| 17 | * $Id: pump.mso 928 2011-04-23 17:40:53Z rafael $ |
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| 18 | *--------------------------------------------------------------------*# |
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| 19 | |
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| 20 | using "streams"; |
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| 21 | |
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| 22 | Model centrifugal_pump |
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| 23 | |
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| 24 | ATTRIBUTES |
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| 25 | Pallete = true; |
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| 26 | Icon = "icon/Pump"; |
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| 27 | Brief = "Model of a centrifugal pump."; |
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| 28 | Info = |
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| 29 | "== Assumptions == |
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| 30 | * Steady State; |
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| 31 | * Only Liquid; |
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| 32 | * Adiabatic; |
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| 33 | * Isentropic. |
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| 34 | "; |
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| 35 | |
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| 36 | PARAMETERS |
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| 37 | outer PP as Plugin (Brief = "External Physical Properties", Type="PP"); |
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| 38 | outer NComp as Integer (Brief = "Number of chemical components", Lower = 1); |
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| 39 | Mw(NComp) as molweight (Brief = "Molar Weight"); |
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| 40 | |
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| 41 | PumpEfficiency as positive (Brief = "Pump Efficiency", Default = 0.75, Lower=1E-3); |
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| 42 | MechanicalEff as positive (Brief = "Mechanical efficiency", Default = 0.95, Lower=1E-3); |
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| 43 | NPSH_Options as Switcher (Brief = "NPSH Options", Valid = ["Default","Include Kinetic Head"], Default = "Default"); |
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| 44 | g as acceleration (Brief = "Gravity Acceleration", Default = 9.81,Hidden = true); |
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| 45 | SuctionArea as area (Brief = "Inlet Nozzle Suction Area", Default = 0.001); |
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| 46 | |
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| 47 | VARIABLES |
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| 48 | Fvol as flow_vol (Brief = "Volumetric Flow Rate" ,Protected=true); |
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| 49 | Fw_in as flow_mass (Brief = "Inlet Mass Flow Rate" ,Protected=true); |
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| 50 | Fw_out as flow_mass (Brief = "Outlet Mass Flow Rate", Protected=true); |
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| 51 | rho_in as dens_mass (Brief = "Mass Density at inlet conditions", Lower = 1E-6, Protected=true); |
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| 52 | rho_out as dens_mass (Brief = "Mass Density at outlet conditions", Lower = 1E-6, Protected=true); |
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| 53 | Mwm as molweight (Brief = "Mixture Molar Weight" ,Protected=true); |
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| 54 | Pvapor as pressure (Brief = "Mixture Vapour Pressure" ,Protected=true); |
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| 55 | |
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| 56 | FluidPower as power (Brief = "Fluid Power"); |
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| 57 | BrakePower as power (Brief = "Brake Power"); |
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| 58 | EletricPower as power (Brief = "Eletrical Potency"); |
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| 59 | |
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| 60 | Pratio as positive (Brief = "Pressure Ratio", Symbol ="P_{ratio}"); |
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| 61 | Pdrop as press_delta (Brief = "Pressure Drop", DisplayUnit = 'kPa', Symbol ="\Delta P"); |
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| 62 | Pincrease as press_delta (Brief = "Pressure Increase",Lower = 0, DisplayUnit = 'kPa', Symbol ="P_{incr}"); |
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| 63 | |
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| 64 | StaticHead as length (Brief = "Static Head"); |
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| 65 | Head as energy_mass (Brief = "Actual Head", Protected=true); |
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| 66 | HeadIsentropic as energy_mass (Brief = "Isentropic Head", Protected=true); |
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| 67 | NPSH_available as length (Brief = "Available Net Positive Suction Head" ,Protected=true); |
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| 68 | |
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| 69 | VelocityHead as length (Brief = "Velocity Head",Protected=true); |
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| 70 | NozzleVelocity as velocity (Brief = "Velocity Inlet Nozzle",Hidden=true); |
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| 71 | |
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| 72 | |
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| 73 | in Inlet as stream (Brief = "Inlet stream", PosX=0, PosY=0.4025, Symbol="_{in}"); |
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| 74 | out Outlet as streamPH (Brief = "Outlet stream", PosX=1, PosY=0.20, Symbol="_{out}"); |
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| 75 | |
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| 76 | in WorkIn as power (Brief = "Work Inlet", PosX=0.5, PosY=1, Protected=true); |
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| 77 | |
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| 78 | SET |
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| 79 | Mw = PP.MolecularWeight(); |
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| 80 | g = 9.81*'m/s^2'; |
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| 81 | |
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| 82 | EQUATIONS |
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| 83 | |
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| 84 | "Velocity Inlet Nozzle" |
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| 85 | Fvol = NozzleVelocity*SuctionArea; |
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| 86 | |
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| 87 | "Velocity Head" |
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| 88 | VelocityHead = 0.5*NozzleVelocity^2/g; |
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| 89 | |
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| 90 | "Average Molecular Weight" |
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| 91 | Mwm = sum(Mw*Inlet.z); |
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| 92 | |
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| 93 | "Mass Density at inlet conditions" |
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| 94 | rho_in = PP.LiquidDensity(Inlet.T, Inlet.P, Inlet.z); |
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| 95 | |
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| 96 | "Mass Density at outlet conditions" |
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| 97 | rho_out= PP.LiquidDensity(Outlet.T, Outlet.P, Outlet.z); |
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| 98 | |
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| 99 | "Inlet Flow Mass" |
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| 100 | Fw_in = Mwm*Inlet.F; |
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| 101 | |
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| 102 | "Outlet Flow Mass" |
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| 103 | Fw_out = Fw_in; |
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| 104 | |
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| 105 | "Pressure Increase" |
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| 106 | Outlet.P = Inlet.P + Pincrease; |
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| 107 | |
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| 108 | "Mixture Vapour Pressure" |
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| 109 | Pvapor = PP.BubbleP(Inlet.T,Inlet.z); |
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| 110 | |
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| 111 | "Pressure Ratio" |
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| 112 | Outlet.P = Inlet.P * Pratio; |
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| 113 | |
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| 114 | "Pressure Drop" |
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| 115 | Outlet.P = Inlet.P - Pdrop; |
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| 116 | |
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| 117 | "Isentropic Head" |
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| 118 | HeadIsentropic = -Pdrop/rho_in; |
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| 119 | |
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| 120 | "Pump Efficiency" |
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| 121 | Head = HeadIsentropic/PumpEfficiency; |
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| 122 | |
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| 123 | "Actual Head" |
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| 124 | Head*Mwm = (Outlet.h-Inlet.h); |
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| 125 | |
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| 126 | "Fluid Power" |
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| 127 | FluidPower = HeadIsentropic *Mwm* Inlet.F; |
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| 128 | |
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| 129 | "Brake Power" |
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| 130 | BrakePower * PumpEfficiency = FluidPower; |
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| 131 | |
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| 132 | "Eletric Power" |
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| 133 | EletricPower = -WorkIn; |
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| 134 | |
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| 135 | "Eletric Power" |
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| 136 | BrakePower = EletricPower * MechanicalEff; |
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| 137 | |
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| 138 | "Molar Balance" |
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| 139 | Outlet.F = Inlet.F; |
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| 140 | |
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| 141 | "Outlet Composition" |
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| 142 | Outlet.z = Inlet.z; |
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| 143 | |
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| 144 | "Volumetric Flow Rate" |
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| 145 | Fvol = Fw_in/rho_in; |
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| 146 | |
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| 147 | switch NPSH_Options |
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| 148 | |
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| 149 | case "Default": |
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| 150 | |
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| 151 | "Net Positive Suction Head Available - Without Velocity Head" |
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| 152 | NPSH_available = (Inlet.P - Pvapor)/(rho_in*g) + StaticHead; |
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| 153 | |
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| 154 | case "Include Kinetic Head": |
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| 155 | |
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| 156 | "Net Positive Suction Head Available - Included Velocity Head" |
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| 157 | NPSH_available = (Inlet.P - Pvapor)/(rho_in*g)+VelocityHead+StaticHead; |
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| 158 | |
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| 159 | |
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| 160 | end |
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| 161 | |
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| 162 | end |
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| 163 | |
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| 164 | #*------------------------------------------------------------------- |
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| 165 | * Model of a pump (simplified, used in distillation column model) |
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| 166 | *---------------------------------------------------------------------- |
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| 167 | * Author: Paula B. Staudt |
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| 168 | *--------------------------------------------------------------------*# |
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| 169 | |
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| 170 | Model pump |
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| 171 | |
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| 172 | ATTRIBUTES |
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| 173 | Pallete = true; |
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| 174 | Icon = "icon/Pump"; |
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| 175 | Brief = "Model of a simplified pump, used in distillation column model."; |
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| 176 | Info = |
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| 177 | "== ASSUMPTIONS == |
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| 178 | * Steady State; |
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| 179 | * Only Liquid; |
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| 180 | * Adiabatic; |
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| 181 | * Isentropic. |
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| 182 | |
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| 183 | == SPECIFY == |
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| 184 | * the inlet stream; |
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| 185 | * the pump Pincrease. |
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| 186 | "; |
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| 187 | |
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| 188 | PARAMETERS |
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| 189 | outer PP as Plugin (Brief = "External Physical Properties", Type="PP"); |
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| 190 | outer NComp as Integer (Brief = "Number of chemical components"); |
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| 191 | |
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| 192 | VARIABLES |
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| 193 | in Inlet as stream (Brief = "Inlet stream", PosX=0, PosY=0.4727, Protected=true,Symbol="_{in}"); |
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| 194 | out Outlet as liquid_stream (Brief = "Outlet stream", PosX=1, PosY=0.1859, Protected=true,Symbol="_{out}"); |
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| 195 | |
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| 196 | Pincrease as press_delta (Brief = "Pressure Increase",Lower = 0, DisplayUnit = 'kPa', Symbol ="P_{incr}"); |
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| 197 | |
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| 198 | EQUATIONS |
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| 199 | |
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| 200 | "Molar Balance" |
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| 201 | Inlet.F = Outlet.F; |
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| 202 | |
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| 203 | "Composittion" |
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| 204 | Inlet.z = Outlet.z; |
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| 205 | |
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| 206 | "Pump head" |
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| 207 | Outlet.P = Inlet.P + Pincrease; |
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| 208 | |
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| 209 | "Pump potency" |
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| 210 | Outlet.h = Inlet.h; |
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| 211 | |
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| 212 | end |
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| 213 | |
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| 214 | Model pump2 |
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| 215 | |
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| 216 | ATTRIBUTES |
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| 217 | Pallete = true; |
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| 218 | Icon = "icon/Pump2"; |
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| 219 | Brief = "Model of a simplified pump, used in distillation column model."; |
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| 220 | Info = |
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| 221 | "== ASSUMPTIONS == |
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| 222 | * Steady State; |
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| 223 | * Only Liquid; |
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| 224 | * Adiabatic; |
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| 225 | * Isentropic. |
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| 226 | |
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| 227 | == SPECIFY == |
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| 228 | * the inlet stream; |
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| 229 | * the pump Pincrease. |
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| 230 | "; |
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| 231 | |
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| 232 | PARAMETERS |
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| 233 | outer PP as Plugin (Brief = "External Physical Properties", Type="PP"); |
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| 234 | outer NComp as Integer (Brief = "Number of chemical components"); |
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| 235 | |
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| 236 | VARIABLES |
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| 237 | in Inlet as stream (Brief = "Inlet stream", PosX=1, PosY=0.4727, Protected=true,Symbol="_{in}"); |
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| 238 | out Outlet as liquid_stream (Brief = "Outlet stream", PosX=0, PosY=0.1859, Protected=true,Symbol="_{out}"); |
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| 239 | |
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| 240 | Pincrease as press_delta (Brief = "Pressure Increase",Lower = 0, DisplayUnit = 'kPa', Symbol ="P_{incr}"); |
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| 241 | |
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| 242 | EQUATIONS |
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| 243 | |
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| 244 | "Molar Balance" |
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| 245 | Inlet.F = Outlet.F; |
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| 246 | |
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| 247 | "Composittion" |
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| 248 | Inlet.z = Outlet.z; |
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| 249 | |
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| 250 | "Pump head" |
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| 251 | Outlet.P = Inlet.P + Pincrease; |
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| 252 | |
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| 253 | "Pump potency" |
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| 254 | # FIXME: add a consistent equation for this pump using the work added |
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| 255 | # and a flashPH call |
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| 256 | # Outlet.h = Inlet.h; |
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| 257 | Outlet.T = Inlet.T; |
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| 258 | |
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| 259 | end |
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| 260 | |
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