A vapor-compression cycle has |QC| = 1500 kW and |QH| = 2100 kW. What is the coefficient of performance of the cycle?
A. 2.5
B. 0.4
C. 3.0
D. 3.5
E. Insufficient information to solve
A. Correct. Using the energy balance to solve for shaftwork supplied to the compressor, assuming no work is recovered by a turbine and applying the definition of the C.O.P. produces this answer.
B. Incorrect. You are making an algebra mistake.
C. Incorrect. You are making a calculation mistake.
D. Incorrect. You are probably not using the correct heat flow to calculate the C.O.P.
E. Incorrect. You have to solve for a missing piece of information first. Check Equation 5.34.
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