source: branches/rate/eml/heat_exchangers/heater.mso @ 507

#*-------------------------------------------------------------------
* 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 489 2008-03-31 19:53:49Z 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"); 
        Ninlet          as Integer      (Brief="Number of Inlet Streams");
        Kvalues         as Switcher (Brief="Option for Display Phase Equilibrium K-values",Valid=["yes","no"], Default="yes");

 VARIABLES
        QDuty                   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",Symbol="K_{value}");
        Pratio(Ninlet )                         as positive                     (Brief = "Pressure Ratio for each stream", Symbol ="P_{ratio}");        
        Pdrop(Ninlet )                  as press_delta          (Brief = "Pressure Drop for each stream", DisplayUnit = 'kPa', Symbol ="\Delta P");
in  Inlet(Ninlet )  as stream                   (Brief = "Inlet Streams", PosX=0, PosY=0.4833, Symbol="^{in}");
out Outlet              as streamPH                     (Brief = "Outlet Stream", PosX=1, PosY=0.4782, Symbol="^{out}");
        
 EQUATIONS

 "Flow"
        Outlet.F = sum(Inlet.F);        

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

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

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

 "Heat Duty"
        QDuty = Outlet.F*Outlet.h - sum(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 streams: Any Number
* 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  InletQ              as energy_stream        (Brief ="Inlet Heat Stream", PosX=0.1662, PosY=1, Symbol="_{out}");

 EQUATIONS
 "Net Duty"
        InletQ.Q = QDuty;
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 streams: Any Number
* 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  InletQ              as energy_stream        (Brief ="Inlet Heat Stream", PosX=0.8245, PosY=1, Symbol="_{out}");

 EQUATIONS
 "Net Duty"
        InletQ.Q = -QDuty;
end