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Consider a typical refrigeration cycle with refrigerant R-134a as the working fluid.

Consider a typical refrigeration cycle with refrigerant R-134a as the working fluid. The
refrigerated space is required to cool at −250C by rejecting its waste heat to cooling water that
enters the condenser at 150C at a rate of 220 g/s and leaves at 230C. The refrigerant enters the
condenser at 1.4 × 106 Pa and 720C and leaves at 450C. The inlet state of the compressor is 6.0
× 104 Pa and −350C. The compressor is estimated to gain a net heat of 450 W from the
surroundings. Determine the COP of the refrigerator, the quality of the refrigerant at the
evaporator inlet, and the refrigeration load. If you vary the compressor inlet condition from 6.0
× 104 Pa to 1.8 × 105 Pa with an increment of 40000 Pa, then compare the results found in each
case.

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