Changeset 995 for trunk/eml/heat_exchangers/HEX_Engine.mso

Timestamp:

Aug 30, 2016, 5:50:48 PM (6 years ago)

Author:

Argimiro Resende Secchi

Message:

Fix negative temperature difference in only one terminal

File:

• trunk/eml/heat_exchangers/HEX_Engine.mso (modified) (1 diff)

trunk/eml/heat_exchangers/HEX_Engine.mso

@@ -255 +255 @@
 EQUATIONS
 
-if abs(DT0 - DTL) > 0.05*max(abs([DT0,DTL])) 
-        
-        then
+if DT0*DTL <= 0 * 'K^2' then
+
+"Log Mean Temperature Difference"
+        LMTD = 0.5*(DT0+DTL);
+
+else if abs(DT0 - DTL) > 0.05*max(abs([DT0,DTL])) then
+        
 "Log Mean Temperature Difference"
         LMTD= (DT0-DTL)/ln(DT0/DTL);
 
-        else
-        
-if DT0*DTL equal 0
-        
-        then
-"Log Mean Temperature Difference"
-        LMTD = 0.5*(DT0+DTL);
-        
-        else
+else
+
 "Log Mean Temperature Difference"
         LMTD = 0.5*(DT0+DTL)*(1-(DT0-DTL)^2/(DT0*DTL)*(1+(DT0-DTL)^2/(DT0*DTL)/2)/12);