Discussion
Assertion (A): Cooling tower water can be cooled below the ambient dry bulb temperature.
Reason (R): Evaporation drives the water towards the wet bulb temperature, which is lower.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. A cooling tower cools by evaporation, not by conduction to the air, so its limit is the wet bulb temperature rather than the dry bulb - and on a hot dry day the wet bulb may be ten or fifteen degrees below the dry bulb. The approach, the gap between the leaving water and the wet bulb, is therefore the measure of a tower’s performance.
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