Air enters a two-stage compressor at 1 atm and 27c and is compressed to 15 atm such

that the pressure ratio across the first stage is 5. the steady mass flow rate is 0.2 kg/s.

between the two stages, the air is cooled at constant pressure to 57c. assume that the

compression process is isentropic. illustrate the process on p ? v and t ? s diagrams.

a) determine the power input to the compressor.

b) determine the rate of heat rejection during the cooling process and calculate the

associated rate of entropy change.

c) how much compressor power would be required for a single stage compression to 15

atm?

d) how much compressor power would be required if the single stage compression to 15

atm occured isothermally?