6-42 Air is compressed from 100 kPa and 15C to a pres- sure of 1000 kPa while being cooled at a rate of 20 kJ/kg by circulating water through the compressor casing. The vol- ume flow rate of the air at the inlet conditions is 140 m/min, and the power input to the compressor is 520 kW. Determine (a) the mass flow rate of the air and (b) the temperature at the compressor exit. Answers: (a) 2.82 kg/s, (b) 451 K