Changeset 129 for trunk

Timestamp:

Jan 23, 2007, 7:00:09 PM (16 years ago)

Author:

gerson bicca

Message:

updated

Location:

trunk/eml/heat_exchangers

Files:

• DoublePipe.mso (modified) (1 diff)
• HEX_Engine.mso (modified) (1 diff)

trunk/eml/heat_exchangers/DoublePipe.mso

@@ -454 +454 @@
 
 "Overall Heat Transfer Coefficient Clean"
-        Details.Uc*(Resistances.Rtube+Resistances.Rwall+Resistances.Rshell)=1;
+        (1/Details.Ud)=(1/Details.Uc)+Resistances.Rfo+Resistances.Rfi*(DoInner/DiInner);
 
 "Overall Heat Transfer Coefficient Dirty"
-        Details.Ud*(Resistances.Rfi*(DoInner/DiInner) + Resistances.Rfo + Resistances.Rtube + Resistances.Rwall + Resistances.Rshell)=1;
+        Details.Ud=1/(DoInner/(Inner.HeatTransfer.hcoeff*DiInner)+Resistances.Rfo+Resistances.Rfi*(DoInner/DiInner)+(DoInner*ln(DoInner/DiInner)/(2*Kwall))+(1/(Outer.HeatTransfer.hcoeff)));
+        
         
 end

trunk/eml/heat_exchangers/HEX_Engine.mso

@@ -252 +252 @@
 #=====================================================================  
 VARIABLES
-A               as area                         (Brief="Exchange Surface Area");
+A               as area                         (Brief="Exchange Surface Area",Lower=1e-6);
 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);