Cooling water is circulated in the plant at a rate of 150,000 kg/hour.

The temperature of the cooling water entering the factory is 30C and when it comes out is 45C. The spent cooling water is cooled in a cooling tower. The air entering the cooling tower is 28C, the pressure is 1 atm and the relative humidity is 60%. The air exits the cooling tower at 38C and 90% relative humidity. Water loss in the form of drift and leakage is 0.3% of the circulated flow rate.

The concentration of dissolved solids in circulated water is 2000 pm and in added water is 500 ppm.

- Calculate: the amount of water that evaporates, cooling efficiency, exhaust water flow rate, added water flow rate, air flow rate.