Ignore:
Timestamp:
Jan 12, 2007, 4:44:02 PM (15 years ago)
Author:
gerson bicca
Message:

modified some equations

File:
1 edited

Legend:

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

    r100 r110  
    6969Hot     as stream; # Inlet Hot Stream
    7070Cold    as stream; # Inlet Cold Stream
     71
    7172end
    7273
     
    7879Hot     as stream_therm;  # Outlet Hot Stream
    7980Cold    as stream_therm;  # Outlet Cold Stream
     81
    8082end
    8183
     
    9496rho             as dens_mass            (Brief="Stream Density" ,Default=1000, Lower=1e-3, Upper=5e5);
    9597Mu              as viscosity            (Brief="Stream Viscosity",Lower=0.0001);
    96 Cp              as cp_mol                       (Brief="Stream Molar Heat Capacity", Upper=10e10);
     98Cp              as cp_mol                       (Brief="Stream Molar Heat Capacity", Upper=1e10);
    9799K               as conductivity         (Brief="Stream Thermal Conductivity", Default=1.0, Lower=1e-5, Upper=500);
     100
    98101end
    99102
     
    106109rho             as dens_mass    (Brief="Stream Density" ,Default=1000, Lower=1e-3, Upper=5e5);
    107110Mu              as viscosity    (Brief="Stream Viscosity",Default=1, Lower=1e-5, Upper=1e5);
    108 Cp              as cp_mol               (Brief="Stream Molar Heat Capacity", Upper=10e10);
     111Cp              as cp_mol               (Brief="Stream Molar Heat Capacity", Upper=1e10);
    109112K               as conductivity (Brief="Stream Thermal Conductivity", Default=1.0, Lower=1e-5, Upper=500);
     113
    110114end
    111115
     
    116120VARIABLES
    117121Mu              as viscosity    (Brief="Stream Viscosity",Default=1, Lower=1e-5, Upper=1e5);
    118 Cp              as cp_mol               (Brief="Stream Molar Heat Capacity", Upper=10e10);
     122Cp              as cp_mol               (Brief="Stream Molar Heat Capacity", Upper=1e10);
    119123K               as conductivity (Brief="Stream Thermal Conductivity", Default=1.0, Lower=1e-5, Upper=500);
    120124Twall   as temperature  (Brief="Wall Temperature",Lower=50);
     125
    121126end
    122127
     
    130135Outlet          as Properties_In_Out;           # Properties at Outlet Stream
    131136Wall            as Properties_Wall;                     # Properties at Wall Temperature
     137
    132138end
    133139
     
    170176Phi   as positive                 (Brief="Phi Correction",Default=1,Lower=1e-3);
    171177Vtube as velocity                 (Brief="Tube Side Velocity",Lower=1e-8);
     178
    172179end
    173180
     
    231238#===================================================================== 
    232239VARIABLES
     240
    233241Rtube   as positive     (Brief="Tube Resistance",Unit="m^2*K/kW",Lower=1e-6);
    234242Rwall   as positive     (Brief="Wall Resistance",Unit="m^2*K/kW",Lower=1e-6);
     
    236244Rfi             as positive     (Brief="Inside Fouling Resistance",Unit="m^2*K/kW",Default=1e-6,Lower=0);
    237245Rfo             as positive     (Brief="Outside Fouling Resistance",Unit="m^2*K/kW",Default=1e-6,Lower=0);
     246
    238247end
    239248
     
    257266"Number of Units Transference"
    258267        NTU*Cmin = Ud*A;
     268       
    259269end
    260270
     
    266276PressureDrop    as Tube_Pdrop;                  #Tube Side Pressure Drop
    267277HeatTransfer    as Tube_Heat_Transfer;  #Tube Side Heat Transfer
     278
    268279end
    269280
     
    275286PressureDrop    as Shell_Pdrop;                 # Shell Side Pressure Drop
    276287HeatTransfer    as Shell_Heat_Transfer; # Shell Side Heat Transfer
     288
    277289end
    278290
     
    284296Pdrop   as press_delta  (Brief="Pressure Drop",Default=0.01, Lower=0);
    285297FPdrop  as Real                 (Brief="Pressure Drop : Fraction of Inlet",Lower=0,Upper=0.8);
     298
    286299end
    287300
     
    293306Hot     as Basic_Pdrop;# Hot Stream
    294307Cold    as Basic_Pdrop;# Cold Stream
     308
    295309end     
    296310
     
    309323Phi     as positive                     (Brief="Phi Correction",Default=1,Lower=1e-3);
    310324Vmean   as velocity                     (Brief="Tube Velocity",Lower=1e-8);
     325
    311326end
    312327
     
    322337fi      as fricfactor   (Brief="Friction Factor", Default=0.05, Lower=1e-10, Upper=2000);
    323338Re              as positive             (Brief="Reynolds Number",Default=100,Lower=1);
     339
    324340end     
    325341
     
    331347HeatTransfer as DoublePipe_HeatTransfer;
    332348PressureDrop as DoublePipe_PressureDrop;
    333 end
     349
     350end
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