A 0.4 m3 rigid tank contains refrigerant-134a initially at 250 kPa and 45 percent quality. Heat is

Question:

A 0.4 m3 rigid tank contains refrigerant-134a initially at 250 kPa and 45 percent quality. Heat is transferred now to the refrigerant from a source at 37oC until pressure rises to 420 kPa. Determine.
(a) The entropy change of the refrigerant.
(b) The entropy change of the heat source.
(c) The total entropy generation in the universe due to the process.