Air enters the compressor of an ideal brayton refrigeration cycle at 100 kpa, 270 k. the compressor pressure ratio is 2, and the temperature at the turbine inlet is 310 k. determine (a) the net work input, per unit mass of air flow, in kj/kg (b) the refrigeration capacity, per unit mass of air flow, in kj/kg (c) the coefficient of performance (d) the coefficient of performance of a carnot refrigeration cycle operating between thermal reservoirs at tc = 270 k and th = 310 k, respectively