source: trunk/eml/costs/reboiler_cost.mso @ 443

#*-------------------------------------------------------------------
* 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 costs for a reboiler
*-------------------------------------------------------------------- 
*
*       Streams:
*               * a liquid inlet stream
*               * a liquid outlet stream
*               * a vapour outlet stream
*               * a feed stream
*
*       Assumptions:
*               * perfect mixing of both phases
*               * thermodynamics equilibrium
*               * no liquid entrainment in the vapour stream
*
*       Specify:
*               * the Feed stream
*               * the Liquid inlet stream
*               * the outlet flows: OutletV.F and OutletL.F
*
*       Initial:
*               * the reboiler temperature (OutletL.T)
*               * the reboiler liquid level (Ll)
*               * (NoComps - 1) OutletL (OR OutletV) compositions
*
*       - This Model is valid if 14m^2 < Across < 1100 m^2
*
*----------------------------------------------------------------------
* Author: Núbia do Carmo Ferreira
* $Id: reboiler.mso 210 2007-03-15 12:52:28Z arge $
*--------------------------------------------------------------------*#

using "stage_separators/reboiler";

Model reboiler_cost as reboiler
        ATTRIBUTES
        Pallete         = true;
        Icon            = "icon/Reboiler";

        PARAMETERS
        Material as Switcher (Valid = ["Stainless steel 316", "Stainless steel 304", "Stainless steel 347", "Nickel 200", "Monel 400", "Inconel 600", "Incoloy 825", "Titanium", "Hastelloy"], 
                        Default = "Stainless steel 316");
        Cost(8,3) as Real;
        
        VARIABLES
        Ce as currency  (Brief="Capital Cost");
        Cb as currency  (Brief="Basic Cost");
        Fd as positive  (Brief="Cost Factor based on the type of the heat exchanger");
        Fp as positive  (Brief="Cost Factor based on the project pressure");
        Fm as positive  (Brief="Cost Factor based on the construction material");
        P  as pressure  (Brief="Average pressure");

        EQUATIONS
        "Average pressure"
        P = 0.5*(InletL.P + OutletL.P);
        
        "Capital Cost"
        Ce = Cb*Fd*Fp*Fm;

        "Basic Cost"
        Cb = 'US$'*exp(Cost(1,1) + Cost(1,2)*ln(Across/'m^2') + Cost(1,3)*(ln(Across/'m^2'))^2);

        "Cost Factor based on the type of the heat exchanger"
        Fd = exp(Cost(3,1) + Cost(3,2)*ln(Across/'m^2') + Cost(3,3)*ln(Across/'m^2'));

        if P <= 700 * 'kPa' then
                "Cost Factor based on the project pressure" # verificar
                Fp = Cost(5,1) + Cost(5,2)*ln(Across/'m^2');
        else if 700 * 'kPa' < P and P < 2100 * 'kPa' then
                Fp = Cost(5,1) + Cost(5,2)*ln(Across/'m^2');
        else if 2100 * 'kPa' < P and P < 4200 * 'kPa' then
                Fp = Cost(6,1) + Cost(6,2)*ln(Across/'m^2');
        else if 4200 * 'kPa' < P and P < 6200 * 'kPa' then
                Fp = Cost(7,1) + Cost(7,2)*ln(Across/'m^2');
        else
                Fp = Cost(7,1) + Cost(7,2)*ln(Across/'m^2'); # verificar
        end
        end
        end
        end

        "Cost Factor based on the construction material"
        Fm = Cost(8,1) + Cost(8,2)*ln(Across/'m^2');
        
end