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Refrigerant R-134a enters the compressor of a vapor-compresion cycle at 120kPa as a saturated vapor and leaves at 900kPa and 75C. The refrigerant leaves the

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Refrigerant R-134a enters the compressor of a vapor-compresion cycle at 120kPa as a saturated vapor and leaves at 900kPa and 75C. The refrigerant leaves the condenser as a saturated liquid. The rate of cooling provided by the system is 5.275kW. Determine the: a) Flow rate of the R134 a (6 marks) b) COP of the cycle (2 marks) c) COP of the cycle if the expansion valve is replaced by an isentropic turbine. Would you recommend such a replacement? (4 marks)

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