Sweating rooftop mats can cool off buildings

Sweating is a vital activity which keeps our body temperatures at a suitable level, even if we may not like it very much. When water evaporates off our skins, that essentially reduces the temperature of the body, thus shielding it from warming up too much on a hot day. Researchers at ETH Zurich are trying to apply the same principle in devising a way to cool off rooftops. They have come up with a rather novel idea to do so. The idea is to use a synethetic mat along the area of the rooftop so that when it rains, the mat absorbs this water.

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