The water when evaporated from a desert cooler absorbs energy from the surrounding and makes the surrounding cool. Evaporation is inversely proportional to humidity. Lesser the humidity and higher the temperature, the faster is the evaporation. So on a hot dry day, the evaporation is more so the surrounding is more cooled. So, a desert cooler cools better on a hot dry day.
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The water when evaporated from a desert cooler absorbs energy from the surrounding and makes the surrounding cool. Evaporation is inversely proportional to humidity. Lesser the humidity and higher the temperature, the faster is the evaporation. So on a hot dry day, the evaporation is more so the surrounding is more cooled. So, a desert cooler cools better on a hot dry day.
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