#*-------------------------------------------------------------------
* 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.
*
*----------------------------------------------------------------------
* Authors: Andrey Copat, Estefane S. Horn, Marcos L. Alencastro
* $Id: turbine.mso 372 2007-09-21 22:17:36Z arge $
*--------------------------------------------------------------------*#

using "streams";

Model Hidraulic_Turbine
	ATTRIBUTES
	Pallete 	= true;
	Icon 		= "icon/HidraulicTurbine"; 
	Brief 		= "Model of a Hidraulic Turbine.";
	Info 		=
"== Assumptions ==
* Steady State;
* Only Liquid;
* Adiabatic;
* Isentropic.
	
== Specify ==
* the inlet stream;
* the Pressure Increase (Pdiff) OR the outlet pressure (Outlet.P);
* the Turbine efficiency (Eff);
* the Brake efficiency (Meff);
* the Volumetric expansivity (Beta).
";
	
	PARAMETERS
outer NComp   	as Integer			(Brief = "Number of chemical components", Lower = 1);
outer PP   		as Plugin			(Brief = "External Physical Properties", Type="PP");
	Mw(NComp) 	as molweight 		(Brief = "Molar Weight");
	
	VARIABLES
	Eff 	as efficiency 		(Brief = "Turbine efficiency");
	Meff 	as efficiency		(Brief = "Brake efficiency");
	Beta 	as positive  		(Brief = "Volumetric expansivity", Unit = '1/K');
	Head	as head				(Brief = "Head Developed");
	FPower 	as power			(Brief = "Fluid Power");
	BPower 	as power			(Brief = "Brake Power");
	EPower 	as power			(Brief = "Eletrical Potency");
	Pratio 	as positive			(Brief = "Pressure Ratio");
	Pdrop	as press_delta		(Brief = "Pressure Drop", DisplayUnit = 'kPa', Symbol ="\Delta P");
	Mwm 	as molweight		(Brief = "Mixture Molar Weight");
	rho		as dens_mass  		(Brief = "Specific Mass");
	Cp		as cp_mol			(Brief = "Heat Capacity");
in	Inlet 	as stream			(Brief = "Inlet stream", PosX=0, PosY=0.5086, Symbol="_{in}");
out	Outlet 	as stream			(Brief = "Outlet stream", PosX=1, PosY=0.5022, Symbol="_{out}");

	SET
	Mw = PP.MolecularWeight();	
	
	EQUATIONS
	#Mixtures Properties
	"Calculate Mwm for Inlet Mixture"
	Mwm = sum(Mw*Inlet.z);

	"Calculate rho using a External Physical Properties Routine"
	rho = PP.LiquidDensity(Inlet.T,Inlet.P,Inlet.z);
	
	"Calculate Outlet Vapour Fraction"
	Outlet.v = PP.VapourFraction(Outlet.T, Outlet.P, Outlet.z);
	
	"Calculate Cp Using a External Physical Properties Routine"
	Cp = PP.LiquidCp(Inlet.T,Inlet.P,Inlet.z);
	
	"Pressure Ratio"
	Outlet.P = Inlet.P * Pratio;

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

	"Calculate Fluid Power"
	FPower * rho = -Pdrop * Inlet.F * Mwm;

	"Calculate Brake Power"
	BPower = FPower * Eff;
	
	"Calculate Eletric Power"
	EPower = BPower * Meff;
	
	"Calculate Outlet Temperature"
	(Outlet.T - Inlet.T) * rho * Cp = (Outlet.h - Inlet.h) * rho
	+ Pdrop * Mwm * (1-Beta*Inlet.T);
	
	"Calculate Outlet Enthalpy"
	(Outlet.h - Inlet.h) * rho =  -Pdrop * Mwm;
	
	"Molar Balance"
	Outlet.F = Inlet.F;
	
	"Calculate Outlet Composition"
	Outlet.z = Inlet.z;

	"Calculate Head"
	Head = Outlet.h - Inlet.h;
end