A counter flowing heat exchanger cools air at 600 K, 400 kPa to 320 K using a supply of water at 20?C, 200 kPa. The water flow rate is 0.1 kg/s and the air flow rate is 1 kg/s. Assume this can be done in a reversible process by the use of distributed heat engines between the lines and neglect kinetic energy changes. Find the water exit temperature and the power out of the heat engine(s).