source: branches/gui/eml/heat_exchangers/heater.mso @ 602

#*-------------------------------------------------------------------
* 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: Gerson Balbueno Bicca 
* $Id: heater.mso 602 2008-08-17 23:19:15Z bicca $
*--------------------------------------------------------------------*#

using "streams";

Model heater_basic

 ATTRIBUTES
        Pallete         = false;
        Brief   = "Basic model for Heater or Cooler Operation";
        Info            =
"Determines thermal and phase conditions of an outlet stream.
";

 PARAMETERS
        outer PP        as Plugin       (Brief="Physical Properties", Type="PP");
        outer NComp     as Integer      (Brief="Number of Components"); 
        Kvalues         as Switcher (Brief="Option for Display Phase Equilibrium K-values",Valid=["yes","no"], Default="yes");

 VARIABLES
        Duty                    as power                (Brief = "Actual Duty",Symbol="Q_{Duty}");
        Vfrac                   as fraction     (Brief = "Vapor fraction Outlet Stream",Symbol="V_{frac}");
        Lfrac                   as fraction     (Brief = "Liquid fraction Outlet Stream",Symbol="L_{frac}");
        Kvalue(NComp)   as Real                 (Brief = "Phase Equilibrium K-values",Lower=1E-30,Upper=1E30,Symbol="K_{value}");
        Pratio                  as positive             (Brief = "Pressure Ratio", Symbol ="P_{ratio}");        
        Pdrop                   as press_delta  (Brief = "Pressure Drop", DisplayUnit = 'kPa', Symbol ="\Delta P");

in  Inlet                       as stream               (Brief = "Inlet Stream", PosX=0, PosY=0.45, Symbol="^{in}");
out Outlet              as streamPH             (Brief = "Outlet Stream", PosX=1, PosY=0.45, Symbol="^{out}");
        
 EQUATIONS

 "Flow"
        Outlet.F = Inlet.F;     

 for j in [1 : NComp] do
        
 "Composition"
        Outlet.F*Outlet.z(j) = Inlet.F*Inlet.z(j);      
        
 end

 "Vapor fraction Outlet Stream"
        Vfrac = Outlet.v;

 "Liquid fraction Outlet Stream"
        Lfrac = 1-Vfrac;

 "Heat Duty"
        Duty = Outlet.F*Outlet.h - Inlet.F*Inlet.h;

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

 "Pressure Ratio"
        Outlet.P = Inlet.P * Pratio;
        
 switch Kvalues # Fix for better convergence !!!

        case "yes":
 "K-values Phase Equilibrium"
        Kvalue*Outlet.x = Outlet.y;

        case "no":
 "K-values Phase Equilibrium"
        Kvalue = 1;

 end

end

Model heater as heater_basic

 ATTRIBUTES
        Pallete         = true;
        Icon            = "icon/heater";        
        Brief   = "Heater";
        Info            =
"Determines thermal and phase conditions of an outlet stream.

== Specify ==
* The Inlet stream
* Specify: 
**The outlet temperature and the outlet pressure or
** The outlet temperature and the inlet energy stream or
** The outlet pressure and the inlet energy stream
";

 VARIABLES

in  Heat                as power        (Brief ="Inlet Heat Stream", PosX=0.5, PosY=1, Symbol="_{out}");

 EQUATIONS

 "Duty Specification"
        Heat = Duty;

end

Model cooler as heater_basic

 ATTRIBUTES
        Pallete         = true;
        Icon            = "icon/cooler";        
        Brief   = "Cooler";
        Info            =
"Determines thermal and phase conditions of an outlet stream.

== Specify ==
* The Inlet stream
* Specify: 
**The outlet temperature and the outlet pressure or
** The outlet temperature and the inlet energy stream or
** The outlet pressure and the inlet energy stream
";

 VARIABLES

in  Heat                as power        (Brief ="Inlet Heat Stream", PosX=0.5, PosY=1, Symbol="_{out}");

 EQUATIONS

 "Duty Specification"
        Heat = -Duty;

end