PROBLEM 5. (20 POINTS)
Sketch an induced draft counter-flow cooling tower, showing how it may be regulated to control
the operation of a refrigeration plant.
A small size cooling tower is designed to cool 5.5 l/s of water with an inlet temperature of 44°C.
The motor-driven fan induces 9 m³/s of air through tower and the power absorbed is 4.75 kW.
The air entering the tower is at 18°C, and has a relative humidity of 60%. The air leaving the
tower can be assumed to be saturated and its temperature is 26°C.
Calculate the final temperature of the water and the amount of cooling water make-up required
per second. Assume the pressure remains constant throughout the tower at 1.013 bar.