A cooling tower is a device that cools a spray of water by passing it through a stream of air. If 15 m3/s of air is at 35 C dry-bulb and 24 C wet-bulb temperature and an atmospheric pressure of 101 kPa enters the tower and the air leaves saturated at 31 C,
(a) to what temperature can this air stream cool a spray of water entering at 38 C with a flow rate of 20 kg/s and
(b) how many kilograms per second of make-up water must be added to compensate for the water that is evaporated?