Changeset 224


Ignore:
Timestamp:
Mar 19, 2007, 8:03:06 PM (15 years ago)
Author:
gerson bicca
Message:

added sample for a detailed shell and tubes heat exchanger

Location:
branches/newlanguage
Files:
2 added
2 edited

Legend:

Unmodified
Added
Removed
  • branches/newlanguage/eml/heat_exchangers/HEX_Engine.mso

    r223 r224  
    127127fi              as fricfactor                   (Brief="Friction Factor", Default=0.05, Lower=1e-10, Upper=2000);
    128128PR              as positive                             (Brief="Tube Side Prandtl Number",Default=0.5,Lower=1e-8);
    129 PRw     as positive                             (Brief="Tube Side Prandtl Number at Wall Temperature",Default=0.5,Lower=1e-8);
    130129Phi             as positive                             (Brief="Phi Correction",Default=1,Lower=1e-3);
    131130Vtube   as velocity                             (Brief="Tube Side Velocity",Lower=1e-8);
     
    172171Re              as positive                             (Brief="Shell Side Reynolds Number",Default=100,Lower=1);
    173172PR              as positive                             (Brief="Shell Side Prandtl Number",Default=0.7,Lower=1e-6);
    174 PRw             as positive                             (Brief="Shell Side Prandtl Number",Default=0.5,Lower=1e-8);
    175173hshell          as heat_trans_coeff     (Brief="Shell Side Film Coefficient",Default=1,Lower=1e-12, Upper=1e6);
    176174Phi     as positive                             (Brief="Phi Correction",Default=1,Lower=1e-3);
     
    235233DTL             as temp_delta   (Brief="Temperature Difference at Outlet",Lower=1);
    236234LMTD            as temp_delta   (Brief="Logarithmic Mean Temperature Difference",Lower=1);
    237 Fc                      as positive             (Brief="LMTD Correction Factor",Lower=0.4);
     235Fc                      as positive             (Brief="LMTD Correction Factor",Lower=0.1);
    238236
    239237EQUATIONS
  • branches/newlanguage/eml/heat_exchangers/HeatExchangerDetailed.mso

    r223 r224  
    813813
    814814"Shell Pressure Drop Baffle Window"
    815         Shell.PressureDrop.Pdwindow    = Nb*((26/Shell.Properties.Average.rho)*mw*Shell.Properties.Average.Mu*(Ncw/(pitch-Dotube)+ Baffles.Ls/(Dw*Dw))+ 0.5*mw*mw/Shell.Properties.Average.rho)*exp(-1.33*(1+Rs)*((Scd + Std)/Shell.HeatTransfer.Sm)^(-0.15*(1+Rs) + 0.8));
    816815        Shell.PressureDrop.Pdwindow    = Nb*((2+0.6*Ncw)*0.5*mw*mw/Shell.Properties.Average.rho)*exp(-1.33*(1+Rs)*((Scd + Std)/Shell.HeatTransfer.Sm)^(-0.15*(1+Rs) + 0.8));
     816       
    817817        when Shell.HeatTransfer.Re < 100 switchto "laminar";
    818818       
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