Dry atmospheric air (70°F, 1 atm) enters a compressor at a flow rate of 120 lbm/h.
The inlet pipe on the compressor has an inside diameter of 0.5 inch. The air leaves the compressor at 175 psia, 100°F. The diameter of the exit pipe leaving the compressor is large compared with the inlet pipe. Therefore, the kinetic energy of the exit flow is negligible, but the inlet kinetic energy is not. The power input to the compressor is 4.75 hp. Determine,

a. The heat transfer rate for the compressor (Btu/h). Is this heat transferred to the compressor or from the compressor?

b. The increase in the flow exergy rate of the air as it flows through the compressor (Btu/h)

c. The exergetic efficiency of the compressor If the compressor was adiabatic and operated with an isentropic efficiency of 80%, determine,

d. The power input to the adiabatic compressor (hp)

e. The increase in the flow exergy rate of the air as it flows through the adiabatic compressor (Btu/h)

f. The exergetic efficiency of the adiabatic compressor