An ideal Brayton gas refrigeration cycle uses air. The air is at 5 psi and -10F when it enters the compressor. The compressor has a compression ratio of 4. The temperature at the turbine entrance is 100F. Determine the cycle's coefficient of performance. Use constant specific heat at room temperature. Consider problem 1 again but this time the compressor and turbine have isentropic efficiencies of 87% and 92% respectively, and the pressure drop across each heat exchanger is 1 psi.