Wednesday, March 09, 2011

HW 7B-3 - Entropy Changes Associated with the Evaporator of a Refrigerator - 4 pts

A refrigerator using R-134a as the refrigerant removes 200 kJ of heat from its refrigerated space. This heat is absorbed by a mixture of saturated liquid and saturated vapor that enters the evaporator at a pressure of 175 kPa. The R-134a leaves the evaporator as a saturated vapor. Determine...
a.) ... the entropy change of the R-134a,
b.) ... the entropy change of the refrigerated space assuming its temperature remains constant at -10°C,
c.) ... the entropy change of the universe for this process.

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