§Air flows
steadily at the rate of 0.4 kg/s through an air compressor, entering at 6 m/s with a pressure of 1 bar and a temperature of 23°C, and leaving at 4.5
m/s with a pressure of 6.9 bar and a temperature of 112°C. The rate of heat
transfer from the compressor to
the surrounding is 60 kW. Calculate the power required to drive the compressor and the inlet and the outlet pipe cross-sectional.