• Card 10 / 35: For a vapor-compression refrigeration system, the enthalpy of the refrigerant at the evaporator input is 88 kJ/kg; the enthalpy at the compressor input is 190 kJ/kg; the enthalpy at the compressor output is 260 kJ/kg. The compression is isenthalpic. What is the coefficient of performance of the system?
    A) 1.0
    B) 2.0
    C) 1.5
    D) 0.66
    E) 3.0

    Answer:
    C) 1.5

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Explanation:

Work is input at the compressor and is 260 kJ/kg - 190 kJ/kg = 70 kJ/kg. Heat is input at the evaporator and is 190 - 88 kJ/kg = 102 kJ/kg. COP = Q/W = 102/70 = 1.46.

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Thermal-Fluid Systems ME303

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Attribution:  Dr. Steve Gibbs. Thermal-Fluid Systems. The Saylor Academy 2014, http://www.saylor.org/courses/me303/
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