2.27. Fifty (50) kmol per hour of air is compressed from P1 = 1.2 bar to P2 = 6.0 bar in a steady-flow compressor. Delivered mechanical power is 98.8 kW. Temperatures

and velocities are: T1 = 300 K T2 = 520 K u1 = 10 m-s-1 u2 = 3.5 m-s-1 Estimate the rate of heat transfer from the compressor. Assume for air that CP =_72 R and that enthalpy is independent of pressure.