An ideal gas refrigeration cycle uses air as the working fluid. The air is at 5 psia and -10°F as it enters the compressor with a compression ratio of 4. The temperature at the turbine entrance is 100°F. Determine this cycle’s COP when the compressor isentropic efficiency is 87 percent, the turbine isentropic efficiency is 94 percent, and the pressure drop across each heat exchanger is 1 psia. Use constant specific heats at room temperature. (Given: The properties of air at room temperature are cp = 0.240 Btu/lbm-R and k = 1.4.