Evaporation is another fro of heat transfer.during evaporation ,when water changes from a liquid to a vapor state,it takes heat energy with it.as a result,the temperature of the remining liquid falls. Evaporative cooling accounts for 80 to 90 % of the coling effect in a cooling tower .but evaporation also causes a loss of the circulating water. For every gallo of water evaporated ,a gallon of makeup water must be added to the system to maintin a constant volume of circulating water .the rate of evaporation is the most important factor in cooling tower  performance . any condition interfering with evaporation .such as reduced air flow ,can greatly reduce efficiency. But the amount ofmoisture in the air,better known as humidity ,has the greatest effect on the rate of evaporation.




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