# help,why the negative energy source does'nt make the temperature decrease, thank you!

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 November 6, 2009, 04:07 #2 New Member   patrick Join Date: Apr 2009 Posts: 14 Rep Power: 10 my email address is bj-luo@hotmail.com, welcome everyone to communicate with me, thank you very much!

 November 6, 2009, 05:04 help,why the negative energy source does'nt make the temperature decrease, thank you! #3 Member   Shane Join Date: Oct 2009 Posts: 52 Rep Power: 9 Try to check the value of C_UDMI(cell,sec_th,(3,4,5,9,11) and source1(2,3). Try to check these two steps. 1) Are they are geeting properly assigned. 2)Also I believe real value are getting truncated. sircorp

 November 6, 2009, 11:08 #4 New Member   patrick Join Date: Apr 2009 Posts: 14 Rep Power: 10 hello sircorp, thank you for your help. the C_UDMI(cell,sec_th,(3,4,5,9,11) and source1(2,3) are correct. source0=-1.79，sour1=1.79，source3=-1.79*20800; I have spent lots of time on it. it is very strange. the energy source is negative, but the temperature is increasing. begging for help!!!

 November 8, 2009, 08:25 #5 New Member   patrick Join Date: Apr 2009 Posts: 14 Rep Power: 10 maybe the problem is from the enthalpy. I assigned both the gas' and the liquid's standard state enthalpy is 0 with a 4.2K reference. but now I found the enthalpy is -1058514j/kg for liquid and -2147306j/kg for gas at 4.2K. I feel confused "is not it 0"? why? who can give me some words, thank you

 November 8, 2009, 11:54 #6 New Member   patrick Join Date: Apr 2009 Posts: 14 Rep Power: 10 is there someone who give me some words about re-defined the enthalpy? h=cp*t? is it possible?

 May 12, 2010, 17:39 #7 New Member   Wei Shao Join Date: Apr 2009 Posts: 3 Rep Power: 10 Have you solved your problem? I have the same problem

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