Ignore:
Timestamp:
Jan 9, 2007, 12:15:56 PM (15 years ago)
Author:
gerson bicca
Message:

updated

File:
1 edited

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  • mso/eml/heat_exchangers/HEX_Engine.mso

    r78 r100  
    146146#===================================================================== 
    147147VARIABLES
    148 
    149148PdTube                  as press_delta  (Brief="Tube Pressure Drop",Default=0.01, Lower=1e-10);
    150149Pdtotal                 as press_delta  (Brief="Total Pressure Drop",Default=0.01, Lower=1e-10);
     
    186185Vnozzle_in      as velocity             (Brief="Inlet Nozzle Velocity",Default=1, Upper=1e5, Lower=0);
    187186Vnozzle_out     as velocity             (Brief="Outlet Nozzle Velocity",Default=1, Upper=1e5, Lower=0);
    188 RVsquare_in     as flux_mass    (Brief="Inlet Nozzle rho-V^2");
    189 RVsquare_out    as flux_mass    (Brief="Outlet Nozzle rho-V^2");
     187RVsquare_out    as positive (Brief = "Outlet Nozzle rho-V^2", Default=1, Upper=1e6, Unit = "kg/s^2/m");
     188RVsquare_in     as positive (Brief = "Inlet Nozzle rho-V^2", Default=1, Upper=1e6, Unit = "kg/s^2/m");
    190189
    191190EQUATIONS
    192 
    193191"Shell Side Total Pressure Drop"
    194192        Pdtotal = PdCross + PdEndZones + Pdnozzle_in + Pdnozzle_out + Pdwindow;
     
    233231#===================================================================== 
    234232VARIABLES
    235 
    236233Rtube   as positive     (Brief="Tube Resistance",Unit="m^2*K/kW",Lower=1e-6);
    237234Rwall   as positive     (Brief="Wall Resistance",Unit="m^2*K/kW",Lower=1e-6);
    238235Rshell  as positive     (Brief="Shell Resistance",Unit="m^2*K/kW",Lower=1e-6);
    239 
     236Rfi             as positive     (Brief="Inside Fouling Resistance",Unit="m^2*K/kW",Default=1e-6,Lower=0);
     237Rfo             as positive     (Brief="Outside Fouling Resistance",Unit="m^2*K/kW",Default=1e-6,Lower=0);
    240238end
    241239
     
    247245A               as area                         (Brief="Exchange Surface Area");
    248246Q               as power                        (Brief="Heat Transfer", Default=7000, Lower=1e-6, Upper=1e10);
    249 U               as heat_trans_coeff (Brief="Overall Heat Transfer Coefficient",Default=1,Lower=1e-6,Upper=1e10);
     247Uc              as heat_trans_coeff (Brief="Overall Heat Transfer Coefficient Clean",Default=1,Lower=1e-6,Upper=1e10);
     248Ud              as heat_trans_coeff (Brief="Overall Heat Transfer Coefficient Dirty",Default=1,Lower=1e-6,Upper=1e10);
    250249Ch      as positive                     (Brief="Hot Stream Heat Capacity",Lower=1e-3,Default=1e3,Unit="W/K");
    251250Cc      as positive                     (Brief="Cold Stream Heat Capacity",Lower=1e-3,Default=1e3,Unit="W/K");
     
    257256EQUATIONS
    258257"Number of Units Transference"
    259         NTU*Cmin = U*A;
     258        NTU*Cmin = Ud*A;
    260259end
    261260
     
    298297Model DoublePipe_HeatTransfer
    299298#=====================================================================
    300 #       Heat Transfer
     299#       Double Pipe Heat Transfer Block
    301300#===================================================================== 
    302301PARAMETERS
     
    314313Model DoublePipe_PressureDrop
    315314#=====================================================================
    316 #       Pressure Drop
     315#       #       Double Pipe Pressure Drop Block
    317316#===================================================================== 
    318317PARAMETERS
     
    326325
    327326Model Main_DoublePipe
     327#=====================================================================
     328#       Double Pipe Main Variables
     329#===================================================================== 
    328330VARIABLES
    329331HeatTransfer as DoublePipe_HeatTransfer;
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