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Air enters the compressor of an ideal brayton refrigeration cycle at 100 kPa, 300K. The compressor...

Air enters the compressor of an ideal brayton refrigeration cycle at 100 kPa, 300K. The compressor presure ratio is 3.75, and the temperature at the turbine inlet is 350 K. The Brayton cycle is then modified by the introduction of a regenerative heat exchanger. In the modified cycle, compressed air enters the regenerative heat exchanger at 350 K and is cooled to 320 K before enetering the turbine. Determine, for the modified cycle, (A) the lowest temperature, in K. (B) the net work input per unit mass of air flow, inkJ/kg (C) the refrigeration capacity, per unit mass of air flow, in kJ.kg (D) the coefficient of performance.

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