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Energy balance between two fluids in shell and tube heat exchanger is not Matching, Why?

Question asked by Vamsi Mokkapati on Jun 24, 2013
Latest reply on Jul 1, 2013 by Jared Conway

Hi,

 

I have been simulating different heat exchangers in solidworks flow simulation, where hot gas @510C transfers its heat to the cold water@90.55C. After simulation, I got the temperatures and specific heats of the both fluids by using surface parameters tool at the exit. From these values I tried to balance energy transfer between gas and water using

mCpdt formula.(where m= mass flow rate, Cp= Specific heat, dt = Temperature difference) but the energy is not balanced, for example heat lost by the gas = 9.5kW, Heat gained by the water =7.5kWm, I wonder where does the remaining 2kW heat is?

 

What's the difference between average temperature and Bulk temperature in the surface parameters results.

 

I attached a heat exchanger model.

 

Thank you very much,

Vamsi Mokkapati.

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