#*-------------------------------------------------------------------
* 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 a Hidraulic Turbine
*--------------------------------------------------------------------
*
*	- Assumptions
*		* Steady State
* 		* Only Liquid
* 		* Adiabatic
* 		* Isentropic
*
*----------------------------------------------------------------------
* Authors: Andrey Copat, Estefane S. Horn, Marcos L. Alencastro
* $Id: turbine.mso 77 2006-12-08 19:21:59Z paula $
*--------------------------------------------------------------------*#

using "streams";
using "pressure_changers/flux_machine_basic";

Model Hidraulic_Turbine as flux_machine_basic

	PARAMETERS
ext NComp   	as Integer			(Brief = "Number of chemical components", Lower = 1);
ext PP   		as CalcObject		(Brief = "External Physical Properties");
	Mw(NComp) 	as molweight 		(Brief = "Molar Weight");
	Eff 	as positive 			(Default = 0.72, Brief = "Pump efficiency");
	Meff 	as positive 			(Default = 1.0, Brief = "Brake efficiency");
	Beta 	as positive  			(Default = 0, Brief = "Volumetric expansivity", Unit = "1/K");
	
	
	VARIABLES
	Head	as head				(Brief = "Head Developed");
	FPower 	as power			(Brief = "Fluid Power");
	BPower 	as power			(Brief = "Brake Power");
	EPower 	as power			(Brief = "Eletrical Potency");
	Pdiff 	as press_delta 		(Brief = "Pressure Increase");
	Pratio 	as positive			(Brief = "Pressure Ratio");	
	Mwm 	as molweight		(Brief = "Mixture Molar Weight");
	rho		as dens_mass  		(Brief = "Specific Mass", Unit="kg/m^3");
	Cp		as cp_mol			(Brief = "Heat Capacity");
	
	SET
	Mw = PP.MolecularWeight();	
	
	EQUATIONS
	#Mixtures Properties
	"Calculate Mwm for Inlet Mixture"
	Mwm = sum(Mw([1:NComp])*Inlet.z([1:NComp]));
	
	"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);
	
	#Mass and Energy Balance and Turbine Equations
	"Calculate Outlet Stream Pressure"
	Outlet.P = Inlet.P + Pdiff;
	
	"Pratio Definition"
	Outlet.P = Inlet.P * Pratio;
	
	"Calculate Fluid Power"
	FPower = Pdiff * Inlet.F / (rho/Mwm);
	
	"Calculate Brake Power"
	BPower = FPower * Eff;
	
	"Calculate Eletric Power"
	EPower = BPower * Meff;
	
	"Calculate Outlet Temperature"
	(Outlet.T - Inlet.T)*Cp = (Outlet.h - Inlet.h) -  Pdiff /(rho/Mwm) * (1-Beta*Inlet.T);
	
	"Calculate Outlet Enthalpy"
	Outlet.h - Inlet.h =  Pdiff / (rho/Mwm);
	
	"Molar Balance"
	Outlet.F = Inlet.F;
	
	"Calculate Outlet Composition"
	Outlet.z = Inlet.z;

	"Calculate Head"
	Head = Pdiff/rho;

end