source: trunk/eml/heat_exchangers/HEX_Engine.mso @ 473

#*-------------------------------------------------------------------
* 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: HEX_Engine.mso 442 2008-01-08 17:56:24Z bicca $
*--------------------------------------------------------------------*#

using "streams";

Model Properties_Average
        
ATTRIBUTES
        Pallete = false;
        Brief = "Average physical properties of the streams.";
        Info =
        "to be documented.";
        
VARIABLES
Mw              as molweight            (Brief="Average Mol Weight",Default=75, Lower=1, Upper=1e8);
T                       as temperature          (Brief="Average  Temperature",Lower=50);
P                       as pressure                     (Brief="Average  Pressure",Default=1, Lower=1e-10, Upper=2e4, DisplayUnit='kPa');
rho             as dens_mass            (Brief="Stream Density" ,Default=1000, Lower=1e-3, Upper=5e5, Symbol = "\rho");
Mu              as viscosity            (Brief="Stream Viscosity",Lower=0.0001, Symbol = "\mu");
Cp              as cp_mol                       (Brief="Stream Molar Heat Capacity", Upper=1e10);
K                       as conductivity         (Brief="Stream Thermal Conductivity", Default=1.0, Lower=1e-5, Upper=500);

end

Model Properties_In_Out
        
ATTRIBUTES
        Pallete = false;
        Brief = "Inlet and outlet physical properties of the streams.";
        Info =
        "to be documented.";
        
VARIABLES
Fw              as flow_mass            (Brief="Stream Mass Flow");
rho             as dens_mass            (Brief="Stream Density" ,Default=1000, Lower=1e-3, Upper=5e5, Symbol = "\rho");
end

Model Properties_Wall
        
ATTRIBUTES
        Pallete = false;
        Brief = "Physical properties of the streams at wall temperature.";
        Info =
        "to be documented.";
        
VARIABLES

Mu              as viscosity            (Brief="Stream Viscosity",Default=1, Lower=1e-5, Upper=1e5, Symbol = "\mu");
Twall           as temperature  (Brief="Wall Temperature",Lower=50);

end

Model Physical_Properties
        
ATTRIBUTES
        Pallete = false;
        Brief = "to be documented";
        Info =
        "to be documented";
        
VARIABLES

Inlet                   as Properties_In_Out            (Brief="Properties at Inlet Stream", Symbol = "^{in}");
Average         as Properties_Average   (Brief="Properties at Average Temperature", Symbol = "^{avg}");
Outlet          as Properties_In_Out            (Brief="Properties at Outlet Stream", Symbol = "^{out}");
Wall                    as Properties_Wall                      (Brief="Properties at Wall Temperature", Symbol = "^{wall}");

end

Model Tube_Pdrop
        
ATTRIBUTES
        Pallete = false;
        Brief = "to be documented";
        Info =
        "to be documented";
        
VARIABLES
PdTube                  as press_delta  (Brief="Tube Pressure Drop",Default=0.01, Lower=1e-10,DisplayUnit='kPa');
Pdtotal                         as press_delta  (Brief="Total Pressure Drop",Default=0.01, Lower=1e-10,DisplayUnit='kPa');
Pdnozzle_in     as press_delta  (Brief="Inlet Nozzle Pressure Drop",Default=0.01, Lower=0,DisplayUnit='kPa');
Pdnozzle_out    as press_delta  (Brief="Outlet Nozzle Pressure Drop",Default=0.01, Lower=0,DisplayUnit='kPa');
Vnozzle_in      as velocity             (Brief="Inlet Nozzle Velocity",Default=1, Upper=1e5, Lower=0);
Vnozzle_out     as velocity             (Brief="Outlet Nozzle Velocity",Default=1, Upper=1e5, Lower=0);
fi                              as fricfactor   (Brief="Friction Factor", Default=0.05, Lower=1e-10, Upper=2000);

EQUATIONS
"Total Pressure Drop"
        Pdtotal = PdTube + Pdnozzle_in + Pdnozzle_out;

end

Model Tube_Heat_Transfer
        
ATTRIBUTES
        Pallete = false;
        Brief = "to be documented";
        Info =
        "to be documented";
        
VARIABLES
Re              as positive                             (Brief="Tube Side Reynolds Number",Default=1000,Lower=1);
Nu              as positive                             (Brief="Nusselt Number",Default=0.5,Lower=1e-8);
htube   as heat_trans_coeff (Brief="Tube Side Film Coefficient",Default=1,Lower=1e-12, Upper=1e6);
fi              as fricfactor                   (Brief="Friction Factor", Default=0.05, Lower=1e-10, Upper=2000);
PR              as positive                             (Brief="Tube Side Prandtl Number",Default=0.5,Lower=1e-8);
Phi             as positive                             (Brief="Phi Correction",Default=1,Lower=1e-3);
Vtube   as velocity                             (Brief="Tube Side Velocity",Lower=1e-8);

end

Model Shell_Pdrop
        
ATTRIBUTES
        Pallete = false;
        Brief = "to be documented";
        Info =
        "to be documented";
        
VARIABLES
Pideal                      as press_delta              (Brief="Ideal Pressure Drop",Default=0.01, Lower=0,DisplayUnit='kPa');
PdCross                         as press_delta          (Brief="Cross Flow Pressure Drop",Default=0.01, Lower=0,DisplayUnit='kPa');
PdEndZones              as press_delta          (Brief="End Zones Pressure Drop",Default=0.01, Lower=0,DisplayUnit='kPa');
Pdwindow                        as press_delta          (Brief="Window Pressure Drop",Default=0.01, Lower=1e-10,DisplayUnit='kPa');
Pdtotal                                 as press_delta          (Brief="Total Pressure Drop",Default=0.01, Lower=0,DisplayUnit='kPa');
Pdnozzle_in             as press_delta          (Brief="Inlet Nozzle Pressure Drop",Default=0.01, Lower=0,DisplayUnit='kPa');
Pdnozzle_out            as press_delta          (Brief="Outlet Nozzle Pressure Drop",Default=0.01, Lower=0,DisplayUnit='kPa');
fi                                      as fricfactor           (Brief="Friction Factor", Default=0.05, Lower=1e-10, Upper=2000);
Vnozzle_in              as velocity                     (Brief="Inlet Nozzle Velocity",Default=1, Upper=1e5, Lower=0);
Vnozzle_out             as velocity                     (Brief="Outlet Nozzle Velocity",Default=1, Upper=1e5, Lower=0);
RVsquare_out            as positive                     (Brief = "Outlet Nozzle rho-V^2", Default=1, Upper=1e6, Unit = 'kg/s^2/m');
RVsquare_in             as positive                     (Brief = "Inlet Nozzle rho-V^2", Default=1, Upper=1e6, Unit = 'kg/s^2/m');

EQUATIONS
"Shell Side Total Pressure Drop"
        Pdtotal = PdCross + PdEndZones + Pdnozzle_in + Pdnozzle_out + Pdwindow;

end

Model Shell_Heat_Transfer
        
ATTRIBUTES
        Pallete = false;
        Brief = "to be documented";
        Info =
        "to be documented";
        
VARIABLES
Re              as positive                             (Brief="Shell Side Reynolds Number",Default=100,Lower=1);
PR              as positive                             (Brief="Shell Side Prandtl Number",Default=0.7,Lower=1e-6);
hshell          as heat_trans_coeff     (Brief="Shell Side Film Coefficient",Default=1,Lower=1e-12, Upper=1e6);
Phi     as positive                             (Brief="Phi Correction",Default=1,Lower=1e-3);
Ji                      as constant                     (Brief="Shell Side Ji Factor",Default=0.05);
Jr                      as positive                             (Brief="Shell Side Jr Factor",Lower=10e-6);
Jl                      as positive                             (Brief="Shell Side Jl Factor",Lower=10e-6);
Jb                      as positive                             (Brief="Shell Side Jb Factor",Lower=10e-6);
Jc                      as positive                             (Brief="Shell Side Jc Factor",Lower=10e-6);
Js                      as positive                             (Brief="Shell Side Js Factor",Lower=10e-6);
Jtotal          as positive                             (Brief="Shell Side Jtotal Factor",Lower=10e-6);
Sm              as area                                 (Brief="Shell Side Cross Flow Area",Default=0.05,Lower=10e-6);

end

Model Baffles_Main
        
ATTRIBUTES
        Pallete = false;
        Brief = "to be documented";
        Info =
        "to be documented";
        
VARIABLES
Ls              as length               (Brief="Central Baffle Spacing",Lower=1e-8);
Lsi             as length               (Brief="Inlet Baffle Spacing",Lower=1e-8);
Lso             as length               (Brief="Outlet Baffle Spacing",Lower=1e-8);

end

Model NTU_Basic

ATTRIBUTES
        Pallete = false;
        Brief = "Number of Units Transference Method.";
        Info =
        "to be documented";

VARIABLES

Ch   as positive        (Brief="Hot Stream Heat Capacity",Lower=1e-3,Default=1e3,Unit='W/K');
Cc   as positive        (Brief="Cold Stream Heat Capacity",Lower=1e-3,Default=1e3,Unit='W/K');
Cr      as positive     (Brief="Heat Capacity Ratio",Default=0.5,Lower=1e-6);
Cmin  as positive       (Brief="Minimum Heat Capacity",Lower=1e-10,Default=1e3,Unit='W/K');
Cmax as positive        (Brief="Maximum Heat Capacity",Lower=1e-10,Default=1e3,Unit='W/K');
NTU     as positive     (Brief="Number of Units Transference",Default=0.05,Lower=1e-10);
Eft     as positive  (Brief="Effectiveness",Default=0.5,Lower=1e-8,Upper=1, Symbol ="\varepsilon");
Eft1    as positive  (Brief="Effectiveness Correction",Lower=1e-8,Default=0.5, Symbol ="\hat {\varepsilon}");

end

Model LMTD_Basic

ATTRIBUTES
        Pallete = false;
        Brief = "Log Mean Temperature Difference Method.";
        Info =
        "to be documented";
        
VARIABLES

DT0             as temp_delta   (Brief="Temperature Difference at Inlet",Lower=1e-6, Symbol ="\Delta T_0");
DTL             as temp_delta   (Brief="Temperature Difference at Outlet",Lower=1e-6, Symbol ="\Delta T_L");
LMTD            as temp_delta   (Brief="Logarithmic Mean Temperature Difference",Lower=1e-6);
Fc                      as positive             (Brief="LMTD Correction Factor",Lower=0.1);

EQUATIONS

if abs(DT0 - DTL) > 0.05*max(abs([DT0,DTL])) 
        
        then
"Log Mean Temperature Difference"
        LMTD= (DT0-DTL)/ln(DT0/DTL);

        else
        
if DT0*DTL equal 0
        
        then
"Log Mean Temperature Difference"
        LMTD = 0.5*(DT0+DTL);
        
        else
"Log Mean Temperature Difference"
        LMTD = 0.5*(DT0+DTL)*(1-(DT0-DTL)^2/(DT0*DTL)*(1+(DT0-DTL)^2/(DT0*DTL)/2)/12);
        
end
        
end

end

Model Details_Main
        
ATTRIBUTES
        Pallete = false;
        Brief = "to be documented";
        Info =
        "to be documented";
        
VARIABLES
A               as area                                 (Brief="Exchange Surface Area");
Q               as power                                (Brief="Heat Transfer", Default=7000, Lower=1e-6, Upper=1e10);
Uc      as heat_trans_coeff (Brief="Overall Heat Transfer Coefficient Clean",Default=1,Lower=1e-6,Upper=1e10);
Ud      as heat_trans_coeff (Brief="Overall Heat Transfer Coefficient Dirty",Default=1,Lower=1e-6,Upper=1e10);

end

Model Tube_Side_Main

ATTRIBUTES
        Pallete = false;
        Brief = "to be documented";
        Info =
        "to be documented";
        
VARIABLES
PressureDrop    as Tube_Pdrop                   (Brief="Tube Side Pressure Drop");
HeatTransfer    as Tube_Heat_Transfer (Brief="Tube Side Heat Transfer");
Properties      as Physical_Properties   (Brief="Tube Side Properties");

end

Model Shell_Side_Main
        
ATTRIBUTES
        Pallete = false;
        Brief = "to be documented";
        Info =
        "to be documented";
        
VARIABLES
PressureDrop    as Shell_Pdrop                           (Brief="Shell Side Pressure Drop");
HeatTransfer    as Shell_Heat_Transfer  (Brief= "Shell Side Heat Transfer");
Properties      as Physical_Properties   (Brief="ShellSide Properties");

end

Model Basic_Pdrop
        
ATTRIBUTES
        Pallete = false;
        Brief = "to be documented";
        Info =
        "to be documented";
        
VARIABLES

Pdrop   as press_delta  (Brief="Pressure Drop",Default=0.01, Lower=0,DisplayUnit='kPa' , Symbol ="\Delta P");
FPdrop  as Real                 (Brief="Pressure Drop : Fraction of Inlet",Lower=0,Upper=0.8);

end

Model DoublePipe_HeatTransfer
        
ATTRIBUTES
        Pallete = false;
        Brief = "to be documented";
        Info =
        "to be documented";
        
PARAMETERS
As                      as area                                         (Brief="Cross Sectional Area for Flow",Default=0.05,Lower=1e-8);
Dh              as length                                       (Brief="Hydraulic Diameter of Pipe for Heat Transfer",Lower=1e-8);

VARIABLES
Re              as positive                             (Brief="Reynolds Number",Default=100,Lower=1);
hcoeff  as heat_trans_coeff (Brief="Film Coefficient",Default=1,Lower=1e-12, Upper=1e6);
fi              as fricfactor                   (Brief="Friction Factor", Default=0.05, Lower=1e-10, Upper=2000);
Nu              as positive                             (Brief="Nusselt Number",Default=0.5,Lower=1e-8);
PR              as positive                             (Brief="Prandtl Number",Default=0.5,Lower=1e-8);
Phi             as positive                             (Brief="Phi Correction",Default=1,Lower=1e-3);
Vmean   as velocity                             (Brief="Tube Velocity",Lower=1e-8);

end

Model DoublePipe_PressureDrop
        
ATTRIBUTES
        Pallete = false;
        Brief = "to be documented";
        Info =
        "to be documented";
        
PARAMETERS

Dh      as length               (Brief="Hydraulic Diameter of Pipe for Pressure Drop",Lower=1e-6);

VARIABLES

Pdrop   as press_delta  (Brief="Total Pressure Drop",Default=0.01, Lower=1e-10,DisplayUnit='kPa', Symbol ="\Delta P");
Pd_fric as press_delta  (Brief="Pressure Drop for friction",Default=0.01, Lower=1e-10,DisplayUnit='kPa', Symbol ="\Delta P_{fric}");
Pd_ret  as press_delta  (Brief="Pressure Drop due to return",Default=0.01, Lower=0,DisplayUnit='kPa', Symbol ="\Delta P_{return}");
fi      as fricfactor   (Brief="Friction Factor", Default=0.05, Lower=1e-10, Upper=2000);
Re      as positive             (Brief="Reynolds Number",Default=100,Lower=1);

end     

Model Main_DoublePipe
        
ATTRIBUTES
        Pallete = false;
        Brief = "to be documented";
        Info =
        "to be documented";
        
VARIABLES

HeatTransfer    as DoublePipe_HeatTransfer      (Brief="Double Pipe Heat Transfer",Symbol=" ");
PressureDrop    as DoublePipe_PressureDrop      (Brief="Double Pipe Pressure Drop", Symbol=" ");
Properties      as Physical_Properties                  (Brief="Double Pipe Properties",Symbol=" " );

end

Model Main_Simplified
        
ATTRIBUTES
        Pallete = false;
        Brief = "to be documented";
        Info =
        "to be documented";
        
VARIABLES

PressureDrop    as Basic_Pdrop                  (Brief="Pressure Drop", Symbol=" ");
Properties      as Physical_Properties   (Brief="Physical Properties", Symbol=" ");

end

Model PHE_HeatTransfer
        
ATTRIBUTES
        Pallete = false;
        Brief = "to be documented";
        Info =
        "to be documented";
        
VARIABLES

Re                              as positive                                     (Brief="Reynolds Number",Default=100,Lower=1);
PR                              as positive                                     (Brief="Prandtl Number",Default=0.5,Lower=1e-8);
NTU                     as positive                                     (Brief="Number of Units Transference",Default=0.05,Lower=1e-10);
WCp                     as positive                                     (Brief="Stream Heat Capacity",Lower=1e-3,Default=1e3,Unit='W/K');
hcoeff          as heat_trans_coeff     (Brief="Film Coefficient",Default=1,Lower=1e-12, Upper=1e6);
Gchannel        as flux_mass                            (Brief ="Channel Mass Flux", Default=1, Lower=1e-6, Symbol ="G^{channel}");
Gports          as flux_mass                            (Brief ="Ports Mass Flux", Default=1, Lower=1e-6, Symbol ="G^{ports}");
Phi                     as positive                                     (Brief="Viscosity Correction",Default=1,Lower=1e-6, Symbol="\phi");

end

Model PHE_PressureDrop
        
ATTRIBUTES
        Pallete = false;
        Brief = "to be documented";
        Info =
        "to be documented";
        
VARIABLES

DPchannel                       as press_delta  (Brief="Channel Pressure Drop",Default=0.01, Lower=1e-10,DisplayUnit='kPa', Symbol ="\Delta P^{channel}");
DPports                         as press_delta  (Brief="Ports Pressure Drop",Default=0.01, Lower=1e-10,DisplayUnit='kPa', Symbol ="\Delta P^{ports}");
Pdrop                           as press_delta  (Brief="Total Pressure Drop",Default=0.01, Lower=1e-10,DisplayUnit='kPa', Symbol ="\Delta P");
fi                                      as fricfactor           (Brief="Friction Factor", Default=0.05, Lower=1e-10, Upper=2000);
Vchannel                        as velocity             (Brief="Stream Velocity in Channel",Lower=1e-8, Symbol ="V^{channel}");
Vports                          as velocity             (Brief="Stream Velocity in Ports",Lower=1e-8, Symbol ="V^{ports}");
Npassage                        as Real                                 (Brief="Number of  Channels per Pass", Symbol ="N^{passage}");
end

Model Main_PHE
        
ATTRIBUTES
        Pallete = false;
        Brief = "to be documented";
        Info =
        "to be documented";
        
VARIABLES

HeatTransfer            as PHE_HeatTransfer             (Brief="PHE Heat Transfer", Symbol = " ");
PressureDrop    as PHE_PressureDrop             (Brief="PHE Pressure Drop", Symbol = " ");
Properties              as Physical_Properties          (Brief="PHE Properties", Symbol = " ");

end

Model Thermal_PHE

ATTRIBUTES
        Pallete = false;
        Brief = "to be documented";
        Info =
        "to be documented";
        
VARIABLES
Cr      as positive                                     (Brief="Heat Capacity Ratio",Default=0.5,Lower=1e-6);
Cmin    as positive                                     (Brief="Minimum Heat Capacity",Lower=1e-10,Default=1e3,Unit='W/K');
Cmax    as positive                                     (Brief="Maximum Heat Capacity",Lower=1e-10,Default=1e3,Unit='W/K');
NTU     as positive                                     (Brief="Number of Units Transference",Default=0.05,Lower=1e-10);
Eft             as positive                             (Brief="Effectiveness",Default=0.5,Lower=0.4,Upper=1, Symbol = "\varepsilon");
Q                       as power                                        (Brief="Heat Transfer", Default=7000, Lower=1e-6, Upper=1e10);
Uc              as heat_trans_coeff     (Brief="Overall Heat Transfer Coefficient Clean",Default=1,Lower=1e-6,Upper=1e10);
Ud              as heat_trans_coeff     (Brief="Overall Heat Transfer Coefficient Dirty",Default=1,Lower=1e-6,Upper=1e10);
end