Air enters the compressor of an ideal gas refrigeration cycle at 7oC and 35 kPa and the

Question:

Air enters the compressor of an ideal gas refrigeration cycle at 7oC and 35 kPa and the turbine at 37oC and 160 kPa. The mass flow rate of air through the cycle is 0.2 kg/s. Assuming variable specific heats for air, determine
(a) The rate of refrigeration.
(b) The net power input.
(c) The coefficient of performance.