Wednesday, April 25, 2007

HW #7, P11 - DeltaS for Heat Transfer to R-134a in a Rigid Tank - ?? pts

A 0.5 m3 rigid tank contains R-134a initially at 200 kPa and 40% quality. Heat is transferred to the refrigerant from a source at 35oC until the pressure rises to 400 kPa. Determine…

a.) The entropy change of the R-134a.
b.) The entropy change of the heat source.
c.)The entropy change of the universe for this process.

2 comments:

Anonymous said...

Is the entropy change of the universe equal to the entropy change of R-134a + entropy change of the source?

Dr. B said...

Yes.