A two-stage reciprocating compressor compresses propane from 1 to 235 psig (7kPa to 16.2 barg) in a refrigeration system. The compression ratio is the same in both stages. Suction temperatures to the...

A two-stage reciprocating compressor compresses propane from 1 to 235 psig (7kPa to 16.2 barg) in a refrigeration system. The compression ratio is the same in both stages. Suction temperatures to the first and second stages are −20°F (−28.9°C) and 80°F (26.7°C). The adiabatic compressor efficiency is 80%. a. Compute the isentropic work required (Btu/lbm, kJ/kg) in each stage of the propane compressor and the discharge temperature assuming ideal gas behavior.