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Question: a heat pump using refrigerant134a as a refrigerant operates its...

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A heat pump using refrigerant-134a as a refrigerant operates its condenser at 900 kPa and its evaporator at 2.46°C. It operates on the ideal vapor-compression refrigeration cycle, except for the compressor, which has an isentropic efficiency of 85 percent. By what percentage do the compressor irreversibilities reduce the heat pump COP as compared to an ideal cycle? (Take the required values from saturated refrigerant-134a tables.)

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