Determine the influence of the evaporator temperature on the heat pump coefficient of performance for an ideal vapor-compression cycle. The working fluid is R-22. The pressure is fixed in the condenser at 1.342MPa. Vary the evaporator temperature over a reasonable range that includes T_sat =  0:653MPa), the condition specified in Problem 9.122. Discuss your results.

Problem 9.22

Determine the heat pump coefficient of performance for an ideal vapor compression refrigeration cycle operating between 0.653 and 1.342 MPa. The working fluid is R-22. Compare your result with that for the real cycle described in Example 9.14.

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T(K) 350 325 300 275 1.0 P=1.342 MPa Teat=290 K 1.2 Teat=270 K 1.4 s (kJ/kg-K) 1.6 Teat=280 K 1.8 2.0