source: trunk/eml/streams.mso @ 270

#*-------------------------------------------------------------------
* 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.
*
*--------------------------------------------------------------------
* Model of basic streams
*----------------------------------------------------------------------
* Author: Paula B. Staudt and Rafael de P. Soares
* $Id: streams.mso 238 2007-04-13 00:02:34Z arge $
*---------------------------------------------------------------------*#

using "types";

Model stream
        ATTRIBUTES
        Pallete = false;
        Brief = "General Material Stream";
        Info =
        "This is the basic building block for the EML models.
        Every model should have input and output streams derived
        from this model.";
        
        PARAMETERS
        outer NComp as Integer (Brief = "Number of chemical components", Lower = 1); 

        VARIABLES
        F as flow_mol;
        T as temperature;
        P as pressure;
        z(NComp) as fraction(Brief = "Overall Molar Fraction");
        h as enth_mol;
        v as fraction(Brief = "Vapourisation fraction");
end

Model liquid_stream as stream
        ATTRIBUTES
        Pallete = false;
        Brief = "Liquid Material Stream";
        Info =
        "Model for liquid material streams.
        This model should be used only when the phase of the stream
        is known ''a priori''.";

        PARAMETERS
        outer PP as Plugin(Brief = "External Physical Properties", Type="PP");
        
        EQUATIONS
        "Liquid Enthalpy"
        h = PP.LiquidEnthalpy(T, P, z);
        "Liquid stream"
        v = 0;
end

Model vapour_stream as stream
        ATTRIBUTES
        Pallete = false;
        Brief = "Vapour Material Stream";
        Info =
        "Model for vapour material streams.
        This model should be used only when the phase of the stream
        is known ''a priori''.";

        PARAMETERS
        outer PP as Plugin(Brief = "External Physical Properties", Type="PP");
        
        EQUATIONS
        "Vapour Enthalpy"
        h = PP.VapourEnthalpy(T, P, z);
        "Vapour stream"
        v = 1;
end

Model streamPH as stream
        PARAMETERS
        outer PP as Plugin(Brief = "External Physical Properties", Type="PP");
        
        VARIABLES
        x(NComp) as fraction(Brief = "Liquid Molar Fraction");
        y(NComp) as fraction(Brief = "Vapour Molar Fraction");
        
        EQUATIONS
        "Flash Calculation"
        [v, x, y] = PP.FlashPH(P, h, z);
        "Enthalpy"
        h = (1-v)*PP.LiquidEnthalpy(T, P, x) +
                v*PP.VapourEnthalpy(T, P, y);
end

Model source
        ATTRIBUTES
        Info =
        "Material stream source.
        This model should be used for boundary streams.
        Usually these streams are known and come from another process
        units.";

        PARAMETERS
        outer PP                        as Plugin               (Brief = "External Physical Properties", Type="PP");
        outer NComp             as Integer              (Brief = "Number of chemical components", Lower = 1); 
                        M(NComp)  as molweight  (Brief="Component Mol Weight");
        
        SET

        M   = PP.MolecularWeight();

        VARIABLES
        out Outlet as stream;
        x(NComp) as fraction(Brief = "Liquid Molar Fraction");
        y(NComp) as fraction(Brief = "Vapour Molar Fraction");
        hl as enth_mol;
        hv as enth_mol;
        zmass(NComp)    as fraction                     (Brief = "Mass Fraction");
        Mw                                      as molweight            (Brief="Average Mol Weight");
        vm                                      as volume_mol   (Brief="Molar Volume"); 
        rho                                     as dens_mass            (Brief="Stream Density");
        Fw                                      as flow_mass            (Brief="Stream Mass Flow");
        Fvol                            as flow_vol         (Brief = "Volumetric Flow");
        
        EQUATIONS
        "Flash Calculation"
        [Outlet.v, x, y] = PP.Flash(Outlet.T, Outlet.P, Outlet.z);
        
        "Overall Enthalpy"
        Outlet.h = (1-Outlet.v)*PP.LiquidEnthalpy(Outlet.T, Outlet.P, x) +
                Outlet.v*PP.VapourEnthalpy(Outlet.T, Outlet.P, y);
        
        hl = PP.LiquidEnthalpy(Outlet.T, Outlet.P, x);
        hv = PP.VapourEnthalpy(Outlet.T, Outlet.P, y);
        
        "Average Molecular Weight"
        Mw = sum(M*Outlet.z);

        "Mass Density"
        rho =   (1-Outlet.v)*PP.LiquidDensity(Outlet.T,Outlet.P,x) + Outlet.v*PP.VapourDensity(Outlet.T,Outlet.P,y);

        "Flow Mass"
        Fw      =  Mw*Outlet.F;

        "Molar Volume"
        vm = (1-Outlet.v)*PP.LiquidVolume(Outlet.T, Outlet.P, x) + Outlet.v*PP.VapourVolume(Outlet.T,Outlet.P,y);
        
        "Volumetric Flow"
        Fvol = Outlet.F*vm ;
        
"Mass Fraction"
        zmass = M*Outlet.z / Mw;        
        
end

Model sink
        ATTRIBUTES
        Info =
        "Material stream sink.
        This model should be used for boundary streams.";

        PARAMETERS
        outer PP                        as Plugin               (Brief = "External Physical Properties", Type="PP");
        outer NComp             as Integer              (Brief = "Number of chemical components", Lower = 1); 
                        M(NComp)  as molweight  (Brief="Component Mol Weight");
        
        SET

        M   = PP.MolecularWeight();
        
        VARIABLES
        in Inlet as stream;
        v as fraction;
        x(NComp)        as fraction                     (Brief = "Liquid Molar Fraction");
        y(NComp)        as fraction                     (Brief = "Vapour Molar Fraction");
        zmass(NComp)    as fraction     (Brief = "Mass Fraction");
        Mw                      as molweight            (Brief="Average Mol Weight");
        vm                      as volume_mol   (Brief="Molar Volume"); 
        rho                     as dens_mass            (Brief="Stream Density");
        Fw                      as flow_mass            (Brief="Stream Mass Flow");
        Fvol          as flow_vol          (Brief = "Volumetric Flow");
        
        EQUATIONS
        "Flash Calculation"
        [v, x, y] = PP.FlashPH(Inlet.P, Inlet.h, Inlet.z);
        
        "Average Molecular Weight"
        Mw = sum(M*Inlet.z);

        "Mass Density"
        rho =   (1-v)*PP.LiquidDensity(Inlet.T,Inlet.P,x) + v*PP.VapourDensity(Inlet.T,Inlet.P,y);

        "Flow Mass"
        Fw      =  Mw*Inlet.F;

        "Molar Volume"
        vm = (1-v)*PP.LiquidVolume(Inlet.T, Inlet.P, x) + v*PP.VapourVolume(Inlet.T,Inlet.P,y);
        
        "Volumetric Flow"
        Fvol = Inlet.F*vm ;
        
        "Mass Fraction"
        zmass = M*Inlet.z / Mw;
        
end