#*-------------------------------------------------------------------
* 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 372 2007-09-21 22:17:36Z arge $
*--------------------------------------------------------------------*#

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 			as positive			(Brief = "Pressure Ratio", Symbol ="P_{ratio}");	
	Pdrop			as press_delta		(Brief = "Pressure Drop", 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