Air enters the compressor of an ideal gas refrigeration cycle at 40F and 10 psia and the

Question:

Air enters the compressor of an ideal gas refrigeration cycle at 40°F and 10 psia and the turbine at 120°F and 30 psia. The mass flow rate of air through the cycle is 0.5 lbm/s. Determine
(a) The rate of refrigeration,
(b) The net power input, and
(c) The coefficient of performance.