Question: A refrigerator using R-134a is located in a 20C room. Consider the cycle to be ideal, except that the compressor is neither adiabatic nor reversible.

A refrigerator using R-134a is located in a 20C room. Consider the cycle to be ideal, except that the compressor is neither adiabatic nor reversible. Saturated vapor at -20C enters the compressor, and the R-134a exits the compressor at 50C. The condenser temperature is 40C. The mass flow rate of refrigerant around the cycle is 0.2 kg/s, and the coefficient of performance is measured and found to be 2.3. Find the power input to the compressor and the rate of entropy generation in the compressor process.

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Table B5 P P P 1017 kPa sat 40C h h 25654 kJkg 17472 h 4308... View full answer

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