Methane is to be compressed from 0.05 MPa and -120°F to 5 MPa in a two-stage compressor. In between adiabatic, reversible stages, a heat exchanger returns the temperature to - 120°F. The intermediate pressure is 1.5 MPa.
What is the work required (kJ/kg) in the first compressor of methane?
What is the temperature at the exit of the first compressor (°C)?
What is the cooling requirement (kJ/kg) in the interstage cooler?