A steady flow compressor having the molar flow rate 50 kmol per hour  compressed the air to 6.0 bar and 520 K from 1.2 bar and 300 K gives a power of 98.8 kW. The initial velocity of air is 10 meter per second and the final velocity is 5.5 meters per second. Calculate the rate of heat transfer from compressor. Assume that enthalpy is independent of pressure and the heat capacity of air is (7/2)R.

(a) -10 kW

(b) 10 kW

(c) -0.99 kW

(d) 0.99 kW