Nitrogen flowing at a rate of 1000 kg/h enters a compressor at 1 bar and 300 K and leaves at 10 bar and 420 K, Cooling water flows through the compressor at the rate of 1500 kg/h, entering at 300 K and leaving at 320 K.

a) How much power is supplied to the compressor? (Ans: 254,100 kJ/h)

b) With the same cooling water flow rate and inlet temperature, calculate the minimum power required to attain the same change in state of nitrogen. (Ans: 227,900 kJ/h)

c) Calculate the efficiency of the compressor.