Air enters the compressor of an ideal Brayton refrigeration cycle at 100 kPa, 300K. The compressor pressure ratio is 3.75, and the temperature at the turbine inlet is 350K. Determine the (a) net work input, per unit mass of air flow, in kJ/kg. (b) refrigeration capacity, per unit mass of air flow, in kJ/kg. (c) coefficient of performance. (d) coefficient of performance of a Carnot refrigeration cycle operating between thermal reservoirs at Tc = 300K and Th = 350K, respectively.