Ignore:
Timestamp:
Nov 27, 2006, 6:37:59 PM (16 years ago)
Author:
gerson bicca
Message:

added double pipe heat exchanger model and updated eml/heat_exchangers

Location:
mso/eml/heat_exchangers
Files:
2 edited

Legend:

Unmodified
Added
Removed

  • mso/eml/heat_exchangers

    • Property svn:ignore set to
      *.dll

  • mso/eml/heat_exchangers/HeatExchangerDetailed.mso

    r45 r68  
    165165        then
    166166
    167 "Heat Capacity Hot Stream"
     167"Hot Stream Average Heat Capacity"
    168168        Properties.Hot.Average.Cp       =               PP.LiquidCp(Properties.Hot.Average.T,Properties.Hot.Average.P,Inlet.Hot.z);
     169
     170"Hot Stream Inlet Heat Capacity"
    169171        Properties.Hot.Inlet.Cp         =               PP.LiquidCp(Inlet.Hot.T,Inlet.Hot.P,Inlet.Hot.z);
     172
     173"Hot Stream Outlet Heat Capacity"
    170174        Properties.Hot.Outlet.Cp        =               PP.LiquidCp(Outlet.Hot.T,Outlet.Hot.P,Outlet.Hot.z);
    171175
    172 "Mass Density Hot Stream"
     176"Hot Stream Average Mass Density"
    173177        Properties.Hot.Average.rho      =               PP.LiquidDensity(Properties.Hot.Average.T,Properties.Hot.Average.P,Inlet.Hot.z);
     178
     179"Hot Stream Inlet Mass Density"
    174180        Properties.Hot.Inlet.rho        =               PP.LiquidDensity(Inlet.Hot.T,Inlet.Hot.P,Inlet.Hot.z);
     181
     182"Hot Stream Outlet Mass Density"       
    175183        Properties.Hot.Outlet.rho       =               PP.LiquidDensity(Outlet.Hot.T,Outlet.Hot.P,Outlet.Hot.z);
    176184
    177 "Viscosity Hot Stream"
     185"Hot Stream Average Viscosity"
    178186        Properties.Hot.Average.Mu       =               PP.LiquidViscosity(Properties.Hot.Average.T,Properties.Hot.Average.P,Inlet.Hot.z);     
     187
     188"Hot Stream Inlet Viscosity"
    179189        Properties.Hot.Inlet.Mu         =               PP.LiquidViscosity(Inlet.Hot.T,Inlet.Hot.P,Inlet.Hot.z);       
     190
     191"Hot Stream Outlet Viscosity"
    180192        Properties.Hot.Outlet.Mu        =               PP.LiquidViscosity(Outlet.Hot.T,Outlet.Hot.P,Outlet.Hot.z);     
    181193
    182 "Conductivity Hot Stream"
    183         Properties.Hot.Average.K        =       PP.LiquidThermalConductivity(Properties.Hot.Average.T,Properties.Hot.Average.P,Inlet.Hot.z);   
    184         Properties.Hot.Inlet.K  =               PP.LiquidThermalConductivity(Inlet.Hot.T,Inlet.Hot.P,Inlet.Hot.z);     
    185         Properties.Hot.Outlet.K         =       PP.LiquidThermalConductivity(Outlet.Hot.T,Outlet.Hot.P,Outlet.Hot.z);   
    186 
    187 "Heat Capacity Hot Stream"
    188         Properties.Hot.Wall.Cp          =       PP.LiquidCp(Properties.Hot.Wall.Twall,Properties.Hot.Average.P,Inlet.Hot.z);
    189 
    190 "Viscosity Hot Stream"
    191         Properties.Hot.Wall.Mu          =       PP.LiquidViscosity(Properties.Hot.Wall.Twall,Properties.Hot.Average.P,Inlet.Hot.z);     
    192 
    193 "Conductivity Hot Stream"
    194         Properties.Hot.Wall.K           =       PP.LiquidThermalConductivity(Properties.Hot.Wall.Twall,Properties.Hot.Average.P,Inlet.Hot.z);   
    195        
    196 
    197         else
    198 
    199 "Heat Capacity Hot Stream"
     194"Hot Stream Average Conductivity"
     195        Properties.Hot.Average.K        =               PP.LiquidThermalConductivity(Properties.Hot.Average.T,Properties.Hot.Average.P,Inlet.Hot.z);   
     196
     197"Hot Stream Inlet Conductivity"
     198        Properties.Hot.Inlet.K          =               PP.LiquidThermalConductivity(Inlet.Hot.T,Inlet.Hot.P,Inlet.Hot.z);     
     199
     200"Hot Stream Outlet Conductivity"
     201        Properties.Hot.Outlet.K         =               PP.LiquidThermalConductivity(Outlet.Hot.T,Outlet.Hot.P,Outlet.Hot.z);   
     202
     203"Hot Stream Heat Capacity at Wall Temperature"
     204        Properties.Hot.Wall.Cp          =               PP.LiquidCp(Properties.Hot.Wall.Twall,Properties.Hot.Average.P,Inlet.Hot.z);
     205
     206"Hot Stream Viscosity  at Wall Temperature"
     207        Properties.Hot.Wall.Mu          =               PP.LiquidViscosity(Properties.Hot.Wall.Twall,Properties.Hot.Average.P,Inlet.Hot.z);     
     208
     209"Hot Stream Conductivity at Wall Temperature"
     210        Properties.Hot.Wall.K           =               PP.LiquidThermalConductivity(Properties.Hot.Wall.Twall,Properties.Hot.Average.P,Inlet.Hot.z);   
     211       
     212
     213        else
     214
     215"Hot Stream Average Heat Capacity"
    200216        Properties.Hot.Average.Cp       =               PP.VapourCp(Properties.Hot.Average.T,Properties.Hot.Average.P,Inlet.Hot.z);
     217
     218"Hot Stream Inlet Heat Capacity"
    201219        Properties.Hot.Inlet.Cp         =               PP.VapourCp(Inlet.Hot.T,Inlet.Hot.P,Inlet.Hot.z);
     220
     221"Hot Stream Outlet Heat Capacity"
    202222        Properties.Hot.Outlet.Cp        =               PP.VapourCp(Outlet.Hot.T,Outlet.Hot.P,Outlet.Hot.z);
    203223
    204 "Mass Density Hot Stream"
     224"Hot Stream Average Mass Density"
    205225        Properties.Hot.Average.rho      =               PP.VapourDensity(Properties.Hot.Average.T,Properties.Hot.Average.P,Inlet.Hot.z);
     226
     227"Hot Stream Inlet Mass Density"
    206228        Properties.Hot.Inlet.rho        =               PP.VapourDensity(Inlet.Hot.T,Inlet.Hot.P,Inlet.Hot.z);
     229
     230"Hot Stream Outlet Mass Density"
    207231        Properties.Hot.Outlet.rho       =               PP.VapourDensity(Outlet.Hot.T,Outlet.Hot.P,Outlet.Hot.z);
    208232
    209 "Viscosity Hot Stream"
     233"Hot Stream Average Viscosity"
    210234        Properties.Hot.Average.Mu       =               PP.VapourViscosity(Properties.Hot.Average.T,Properties.Hot.Average.P,Inlet.Hot.z);
     235
     236"Hot Stream Inlet Viscosity"
    211237        Properties.Hot.Inlet.Mu         =               PP.VapourViscosity(Inlet.Hot.T,Inlet.Hot.P,Inlet.Hot.z);
     238
     239"Hot Stream Outlet Viscosity"
    212240        Properties.Hot.Outlet.Mu        =               PP.VapourViscosity(Outlet.Hot.T,Outlet.Hot.P,Outlet.Hot.z);
    213241
    214 "Conductivity Hot Stream"
    215         Properties.Hot.Average.K        =       PP.VapourThermalConductivity(Properties.Hot.Average.T,Properties.Hot.Average.P,Inlet.Hot.z);   
    216         Properties.Hot.Inlet.K  =               PP.VapourThermalConductivity(Inlet.Hot.T,Inlet.Hot.P,Inlet.Hot.z);     
    217         Properties.Hot.Outlet.K         =       PP.VapourThermalConductivity(Outlet.Hot.T,Outlet.Hot.P,Outlet.Hot.z);   
    218 
    219 "Heat Capacity Hot Stream"
    220         Properties.Hot.Wall.Cp  =       PP.VapourCp(Properties.Hot.Wall.Twall,Properties.Hot.Average.P,Inlet.Hot.z);
    221 
    222 "Viscosity Hot Stream"
    223         Properties.Hot.Wall.Mu  =       PP.VapourViscosity(Properties.Hot.Wall.Twall,Properties.Hot.Average.P,Inlet.Hot.z);
    224 
    225 "Conductivity Hot Stream"
    226         Properties.Hot.Wall.K   =       PP.VapourThermalConductivity(Properties.Hot.Wall.Twall,Properties.Hot.Average.P,Inlet.Hot.z);   
     242"Hot Stream Average Conductivity"
     243        Properties.Hot.Average.K        =               PP.VapourThermalConductivity(Properties.Hot.Average.T,Properties.Hot.Average.P,Inlet.Hot.z);   
     244
     245"Hot Stream Inlet Conductivity"
     246        Properties.Hot.Inlet.K          =               PP.VapourThermalConductivity(Inlet.Hot.T,Inlet.Hot.P,Inlet.Hot.z);     
     247       
     248"Hot Stream Outlet Conductivity"
     249        Properties.Hot.Outlet.K         =               PP.VapourThermalConductivity(Outlet.Hot.T,Outlet.Hot.P,Outlet.Hot.z);   
     250
     251"Hot Stream Heat Capacity at Wall Temperature"
     252        Properties.Hot.Wall.Cp          =               PP.VapourCp(Properties.Hot.Wall.Twall,Properties.Hot.Average.P,Inlet.Hot.z);
     253
     254"Hot Stream Viscosity at Wall Temperature"
     255        Properties.Hot.Wall.Mu          =               PP.VapourViscosity(Properties.Hot.Wall.Twall,Properties.Hot.Average.P,Inlet.Hot.z);
     256
     257"Hot Stream Conductivity at Wall Temperature"
     258        Properties.Hot.Wall.K           =               PP.VapourThermalConductivity(Properties.Hot.Wall.Twall,Properties.Hot.Average.P,Inlet.Hot.z);   
    227259
    228260
    … …  
    423455
    424456"Shell Side Phi correction"
    425         Shell.HeatTransfer.Phi = HE.PhiCorrection(Properties.Hot.Average.Mu,Properties.Hot.Wall.Mu);
     457        Shell.HeatTransfer.Phi  = HE.PhiCorrection(Properties.Hot.Average.Mu,Properties.Hot.Wall.Mu);
    426458       
    427459"Tube Side Phi correction"
    … …  
    431463       
    432464"Shell Side Phi correction"
    433         Shell.HeatTransfer.Phi = HE.PhiCorrection(Properties.Cold.Average.Mu,Properties.Cold.Wall.Mu);
     465        Shell.HeatTransfer.Phi  = HE.PhiCorrection(Properties.Cold.Average.Mu,Properties.Cold.Wall.Mu);
    434466       
    435467"Tube Side Phi correction"
    … …  
    449481       
    450482"Hot Wall Temperature"
    451         Properties.Hot.Wall.Twall  = (Properties.Hot.Average.T+Properties.Cold.Average.T)/2;
     483        Properties.Hot.Wall.Twall       = (Properties.Hot.Average.T+Properties.Cold.Average.T)/2;
    452484
    453485"ColdWall Temperature"
    … …  
    455487
    456488"Tube Side Velocity"
    457         Tubes.HeatTransfer.Vtube  = Properties.Cold.Inlet.Fw*Tpass/((Pi*Ditube*Ditube/4)*Properties.Cold.Average.rho*Ntt);
     489        Tubes.HeatTransfer.Vtube        = Properties.Cold.Inlet.Fw*Tpass/((Pi*Ditube*Ditube/4)*Properties.Cold.Average.rho*Ntt);
    458490
    459491"Tube Side Reynolds Number"
    460         Tubes.HeatTransfer.Re     =     (Properties.Cold.Average.rho*Tubes.HeatTransfer.Vtube*Ditube)/Properties.Cold.Average.Mu;
     492        Tubes.HeatTransfer.Re           = (Properties.Cold.Average.rho*Tubes.HeatTransfer.Vtube*Ditube)/Properties.Cold.Average.Mu;
    461493       
    462494"Tube Side Prandtl Number"
    463         Tubes.HeatTransfer.PR = ((Properties.Cold.Average.Cp/Properties.Cold.Average.Mw)*Properties.Cold.Average.Mu)/Properties.Cold.Average.K;
     495        Tubes.HeatTransfer.PR           = ((Properties.Cold.Average.Cp/Properties.Cold.Average.Mw)*Properties.Cold.Average.Mu)/Properties.Cold.Average.K;
    464496
    465497"Tube Side Prandtl Number at Wall Temperature"
    466         Tubes.HeatTransfer.PRw = ((Properties.Cold.Wall.Cp/Properties.Cold.Average.Mw)*Properties.Cold.Wall.Mu)/Properties.Cold.Wall.K;
     498        Tubes.HeatTransfer.PRw          = ((Properties.Cold.Wall.Cp/Properties.Cold.Average.Mw)*Properties.Cold.Wall.Mu)/Properties.Cold.Wall.K;
    467499
    468500"Tube Side Film Coefficient"
    469         Tubes.HeatTransfer.htube= HE.TubeFilmCoeff(Tubes.HeatTransfer.Re,Tubes.HeatTransfer.PR,Properties.Cold.Average.K)*Tubes.HeatTransfer.Phi;
     501        Tubes.HeatTransfer.htube        = HE.TubeFilmCoeff(Tubes.HeatTransfer.Re,Tubes.HeatTransfer.PR,Properties.Cold.Average.K)*Tubes.HeatTransfer.Phi;
    470502
    471503"Shell Side Prandtl Number"
    472         Shell.HeatTransfer.PR = ((Properties.Hot.Average.Cp/Properties.Hot.Average.Mw)*Properties.Hot.Average.Mu)/Properties.Hot.Average.K;
     504        Shell.HeatTransfer.PR           = ((Properties.Hot.Average.Cp/Properties.Hot.Average.Mw)*Properties.Hot.Average.Mu)/Properties.Hot.Average.K;
    473505
    474506"Shell Side Prandtl Number at Wall Temperature"
    475         Shell.HeatTransfer.PRw = ((Properties.Hot.Wall.Cp/Properties.Hot.Average.Mw)*Properties.Hot.Wall.Mu)/Properties.Hot.Wall.K;
     507        Shell.HeatTransfer.PRw          = ((Properties.Hot.Wall.Cp/Properties.Hot.Average.Mw)*Properties.Hot.Wall.Mu)/Properties.Hot.Wall.K;
    476508
    477509"Tube Side Pressure Drop"
    … …  
    497529
    498530"Shell Pressure Drop Outlet Nozzle"
    499         Shell.PressureDrop.Pdnozzle_out =HE.DeltaPshellNozzleOut(Properties.Hot.Outlet.rho,Properties.Hot.Inlet.Fw);
     531        Shell.PressureDrop.Pdnozzle_out = HE.DeltaPshellNozzleOut(Properties.Hot.Outlet.rho,Properties.Hot.Inlet.Fw);
    500532
    501533"Velocity Shell Side Outlet Nozzle"
    … …  
    621653       
    622654VARIABLES
     655
    623656DT0     as temp_delta   (Brief="Temperature Difference at Inlet",Lower=1);
    624657DTL             as temp_delta   (Brief="Temperature Difference at Outlet",Lower=1);
    … …  
    12951328VARIABLES
    12961329
    1297 LMTD(Nshell)            as temp_delta   (Brief="Logarithmic Mean Temperature Difference",Lower=10);
    1298 Fc(Nshell)                      as positive             (Brief="LMTD Correction Factor",Lower=0.75);
    1299 MTD(Nshell)                     as temp_delta   (Brief="Mean Temperature Difference");
     1330LMTD(Nshell)            as temp_delta   (Brief="Logarithmic Mean Temperature Difference",Lower=5);
     1331Fc(Nshell)                      as positive             (Brief="LMTD Correction Factor",Lower=0.5);
     1332MTD(Nshell)                     as temp_delta   (Brief="Mean Temperature Difference",Lower=5);
    13001333Unity(Nshell)           as HeatExchangerDetailed_Basic;
    13011334
    … …  
    15151548       
    15161549"Overall Heat Transfer Coefficient"
    1517         Unity(i).Details.U=1/(Dotube/(Unity(i).Tubes.HeatTransfer.htube*Ditube)+(Dotube*ln(Dotube/Ditube)/(2*Kwall))+(1/(Unity(i).Shell.HeatTransfer.hshell)));
     1550        Unity(i).Details.U*(Dotube/(Unity(i).Tubes.HeatTransfer.htube*Ditube)+(Dotube*ln(Dotube/Ditube)/(2*Kwall))+(1/(Unity(i).Shell.HeatTransfer.hshell)))=1;
    15181551
    15191552"Exchange Surface Area"
    … …  
    15731606
    15741607"Exchange Surface Area"
    1575         Unity(i).Details.Q   = Unity(i).Details.U*Unity(i).Details.A*Fc(i)*LMTD(i);
     1608#       Unity(i).Details.Q   = Unity(i).Details.U*Unity(i).Details.A*Fc(i)*LMTD(i);
     1609        Unity(i).Details.Q   = Unity(i).Details.U*Pi*Dotube*Ntt*Ltube*Fc(i)*LMTD(i);
    15761610       
    15771611"Mean Temperature Difference"   
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