A vapor-compression cycle uses Freon® 22 as the refrigerant. The fluid leaving the boiler is saturated vapor at T = 253.15 K. The fluid leaving the condenser is saturated liquid at T = 303.15 K. The compressor has an efficiency of 80 %. What is the coefficient of performance of the cycle?
A. 5.1
B. 3.9
C. 2.9
D. 3.6
E. Insufficient information to solve
A. Incorrect. This would be the C.O.P. of a Carnot refrigerator, but here you have a real refrigerator with irreversible operation.
B. Incorrect. You may have used the wrong Q in calculating the C.O.P.
C. Correct. This is very similar to Example 5-3.
D. Incorrect. You may have used the reversible work instead of the actual work in calculating C.O.P. Review Example 5-3.
E. Incorrect. There is enough information present to solve for the C.O.P. if you review Example 5-3.
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