interior volume, sorce term, energy is not in banlance?
 

Hi,all

I'm simulating a heatexchanger, which is similar to the outdoor machine of the air conditioner.
I specify a interior volume(which represents heatexchanger, regarded as air fluid) as "source term", and define the right heat exchange rate as *** w/(m3).
after convorge, I look at the energy banlance, but the air temperature increase is not so high as expected, only about half increase? then where is the problem?

thank you very much.

ZZ