An ideal Brayton refrigeration cycle has air entering at 100 kPa, 270 K. The compressor pressure ratio is 3, and the temperature at the turbine inlet is 310 K. The isentropic efficiencies of the compressor and turbine are 82% and 85 % respectively. Determine 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 = 270 K and TH = 310 K, respectively.