source: branches/gui/eml/pressure_changers/pump.mso @ 741

#*-------------------------------------------------------------------
* EMSO Model Library (EML) Copyright (C) 2004 - 2007 ALSOC.
*
* This LIBRARY is free software; you can distribute it and/or modify
* it under the therms of the ALSOC FREE LICENSE as available at
* http://www.enq.ufrgs.br/alsoc.
*
* EMSO Copyright (C) 2004 - 2007 ALSOC, original code
* from http://www.rps.eng.br Copyright (C) 2002-2004.
* All rights reserved.
*
* EMSO is distributed under the therms of the ALSOC LICENSE as
* available at http://www.enq.ufrgs.br/alsoc.
*
*----------------------------------------------------------------------
* Author: Andrey Copat, Estefane S. Horn, Marcos L. Alencastro
* $Id: pump.mso 741 2009-03-03 23:53:00Z bicca $
*--------------------------------------------------------------------*#

using "streams";

Model centrifugal_pump
        
ATTRIBUTES
        Pallete         = true;
        Icon            = "icon/Pump"; 
        Brief           = "Model of a centrifugal pump.";
        Info            =
"== Assumptions ==
* Steady State;
* Only Liquid;
* Adiabatic;
* Isentropic.
";
        
PARAMETERS
        outer PP                        as Plugin                       (Brief = "External Physical Properties", Type="PP");
        outer NComp     as Integer                      (Brief = "Number of chemical components", Lower = 1);
        Mw(NComp)               as molweight    (Brief = "Molar Weight");
        
        PumpEfficiency          as positive             (Brief = "Pump Efficiency", Default = 0.75, Lower=1E-3);
        MechanicalEff           as positive             (Brief = "Mechanical efficiency", Default = 0.95, Lower=1E-3);
        NPSH_Options         as Switcher                (Brief = "NPSH Options", Valid = ["Default","Include Kinetic Head"], Default = "Default");
        g                                                       as acceleration (Brief = "Gravity Acceleration", Default = 9.81,Hidden = true);
        SuctionArea                     as area                         (Brief = "Inlet Nozzle Suction Area", Default = 0.001);
        
VARIABLES
        Fvol                            as flow_vol             (Brief = "Volumetric Flow Rate" ,Protected=true);
        Fw_in                   as flow_mass    (Brief = "Inlet Mass Flow Rate" ,Protected=true);
        Fw_out                  as flow_mass    (Brief = "Outlet Mass Flow Rate", Protected=true);
        rho_in                  as dens_mass    (Brief = "Mass Density at inlet conditions", Lower = 1E-6, Protected=true);
        rho_out                 as dens_mass    (Brief = "Mass Density at outlet conditions", Lower = 1E-6, Protected=true);
        Mwm                     as molweight    (Brief = "Mixture Molar Weight" ,Protected=true);
        Pvapor                  as pressure             (Brief = "Mixture Vapour Pressure" ,Protected=true);    
        
        FluidPower        as power                      (Brief = "Fluid Power");
        BrakePower       as power                       (Brief = "Brake Power");
        EletricPower      as power                      (Brief = "Eletrical Potency");
        
        Pratio          as positive             (Brief = "Pressure Ratio", Symbol ="P_{ratio}");        
        Pdrop           as press_delta  (Brief = "Pressure Drop", DisplayUnit = 'kPa', Symbol ="\Delta P");
        Pincrease       as press_delta  (Brief = "Pressure Increase",Lower = 0,  DisplayUnit = 'kPa', Symbol ="P_{incr}");
        
        Head                                    as energy_mass  (Brief = "Actual Head", Protected=true);
        HeadIsentropic          as energy_mass  (Brief = "Isentropic Head", Protected=true);
        NPSH_available          as length                               (Brief = "Available Net Positive Suction Head" ,Protected=true);

        VelocityHead                    as length                       (Brief = "Velocity Head");
        StaticHead                      as length                       (Brief = "Static Head");
        NozzleVelocity          as velocity                     (Brief = "Velocity Inlet Nozzle");

        
in              Inlet           as stream                       (Brief = "Inlet stream", PosX=0, PosY=0.4025, Symbol="_{in}");
out     Outlet  as streamPH             (Brief = "Outlet stream", PosX=1, PosY=0.20, Symbol="_{out}");

SET
        Mw      = PP.MolecularWeight();
        g               = 9.81*'m/s^2';
        
EQUATIONS

 "Velocity Inlet Nozzle"
        Fvol = NozzleVelocity*SuctionArea;

"Velocity Head"
        VelocityHead = 0.5*NozzleVelocity^2/g;

"Average Molecular Weight"
        Mwm = sum(Mw*Inlet.z);

"Mass Density at inlet conditions"
        rho_in = PP.LiquidDensity(Inlet.T, Inlet.P, Inlet.z);

"Mass Density at outlet conditions"
        rho_out= PP.LiquidDensity(Outlet.T, Outlet.P, Outlet.z);

"Inlet Flow Mass"
        Fw_in   =  Mwm*Inlet.F;

"Outlet Flow Mass"
        Fw_out  =  Fw_in;
        
"Pressure Increase"
        Outlet.P  = Inlet.P + Pincrease;
        
"Mixture Vapour Pressure"
        Pvapor = PP.BubbleP(Inlet.T,Inlet.z); 
        
"Pressure Ratio"
        Outlet.P = Inlet.P * Pratio;

"Pressure Drop"
        Outlet.P  = Inlet.P - Pdrop;

"Isentropic Head"
        HeadIsentropic = -Pdrop/rho_in;

"Pump Efficiency"
        Head = HeadIsentropic/PumpEfficiency; 
        
"Actual Head"
        Head*Mwm = (Outlet.h-Inlet.h);
        
"Fluid Power"
        FluidPower = HeadIsentropic *Mwm* Inlet.F;

"Brake Power"
        BrakePower * PumpEfficiency = FluidPower;

"Eletric Power"
        BrakePower = EletricPower * MechanicalEff;
        
"Molar Balance"
        Outlet.F = Inlet.F;

"Outlet Composition"
        Outlet.z = Inlet.z;

"Volumetric Flow Rate"
        Fvol = Fw_in/rho_in;

switch NPSH_Options
        
        case "Default":
        
"Net Positive Suction Head Available - Without Velocity Head"
        NPSH_available = (Inlet.P - Pvapor)/(rho_in*g) + StaticHead;    
        
        case "Include Kinetic Head":
        
"Net Positive Suction Head Available - Included Velocity Head"
        NPSH_available = (Inlet.P - Pvapor)/(rho_in*g)+VelocityHead+StaticHead;
        
        
end

end

#*-------------------------------------------------------------------
* Model of a pump (simplified, used in distillation column model)
*----------------------------------------------------------------------
* Author: Paula B. Staudt
*--------------------------------------------------------------------*#

Model pump
        ATTRIBUTES
        Pallete         = true;
        Icon            = "icon/Pump"; 
        Brief           = "Model of a simplified pump, used in distillation column model.";
        Info            =
        "Specify: 
         * the inlet stream;
         * the pump press delta dP.
        ";
        
        PARAMETERS
outer PP as Plugin (Brief = "External Physical Properties", Type="PP");
outer NComp as Integer;
        
        VARIABLES
in      Inlet           as stream               (Brief = "Inlet stream", PosX=0, PosY=0.4727, Symbol="_{in}");
out     Outlet          as streamPH             (Brief = "Outlet stream", PosX=1, PosY=0.1859, Symbol="_{out}");
        
        dP as press_delta (Brief="Pump head");
        
        EQUATIONS
        "Molar Balance"
        Inlet.F = Outlet.F;
        Inlet.z = Outlet.z;
        
        "Pump head"
        Outlet.P = Inlet.P + dP;
        
        "FIXME: pump potency"
        Outlet.h = Inlet.h;
end