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.

Trades & Technology

You might also like to view...

Answer the following statement(s) true (T) or false (F)

The gas must be turned off for the portion of the fuel gas piping system that is to be worked on.

Trades & Technology

Describe how a tree grows in length. How does it grow in diameter?

What will be an ideal response?

Trades & Technology

Organic materials are composed of substances that _____

A) are manufactured B) occur only in nature C) are processed D) are not cooked

Trades & Technology

When unrolling cable from a coil, the best way is to pull the cable out of the coil from the __________.

a. outside of the coil b. inside of the coil c. underside of the coil d. None of the above

Trades & Technology