The concept of moving air across a water stream to produce a cooling effect did not originate with the first cooling tower. As early as the times of the ancient Egyptians, Romans, and Greeks, wet fabric mats were hung in the windows and doorways of dwellings to cool the indoor environment. Wind blowing through the mats evaporated the water, thereby cooling the air entering the building. The same technique was later used in the royal palaces of India.
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