<P> A cooling tower is a heat rejection device that rejects waste heat to the atmosphere through the cooling of a water stream to a lower temperature . Cooling towers may either use the evaporation of water to remove process heat and cool the working fluid to near the wet - bulb air temperature or, in the case of closed circuit dry cooling towers, rely solely on air to cool the working fluid to near the dry - bulb air temperature . </P> <P> Common applications include cooling the circulating water used in oil refineries, petrochemical and other chemical plants, thermal power stations and HVAC systems for cooling buildings . The classification is based on the type of air induction into the tower: the main types of cooling towers are natural draft and induced draft cooling towers . </P>

Why we use cooling tower in power plant
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