An ideal Brayton refrigeration cycle has a compressor pressure ratio of 6. At the compressor inlet, the

Question:

An ideal Brayton refrigeration cycle has a compressor pressure ratio of 6. At the compressor inlet, the pressure and temperature of the entering air are 55 lbf/in2 and 600oR. The temperature at the exit of the turbine is 370oR. For a refrigerating capacity of 15 tons, determine
(a) The specific volumes of the air at the compressor and turbine inlets, each in ft3/lb.
(b) The net power input in Btu/min,
(c) The coefficient of performance (COPR) and