Air enters the compressor of a perfect-gas refrigeration cycle at 15oC, 50 kPa and the turbine at

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Air enters the compressor of a perfect-gas refrigeration cycle at 15oC, 50 kPa and the turbine at 50oC, 300 kPa. The mass flow rate through the cycle is 0.25 kg/s. Assuming constant specific heats for air (PG model), determine
(a) The rate of refrigeration,
(b) The net power input and
(c) The coefficient of performance (COPR).
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