1.75 kg/s of air at 300. K enters the compressor of a reversed Brayton cycle heat pump. The isentropic pressure ratio of the compressor is 3.00 to 1, and the inlet temperature of the expander is 335 K.
The isentropic efficiencies of the compressor and expander are 91.0% and 85.0%, respectively. Determine
a. The actual power output from the expander.
b. The actual power input to the compressor.
c. The coefficient of performance of the unit.