An evaporative cooler (also swamp cooler, desert cooler and wet air cooler) is a device that cools air through the evaporation of water.
When water evaporates into the air, the result is a mixture of air and water molecules. This chemical change requires heat, thus energy or latent heat is taken from the air molecules – dropping the actual temperature of the air.
The process of evaporation happens all the time. Our bodies, for example, perspire in hot weather; through evaporation the sweat dries and drops our body temperature.Whenever dry air passes over water, some of the water will be absorbed by the air. That’s why evaporative cooling naturally occurs near waterfalls, at rivers, lakes and oceans.
The drop in temperature depends on various factors i.e. Air Temperature, % Relative Humidity Level, Room Size, Degree of Insulation & Cross Ventilation. The temperature of air coming out of an evaporative air cooler depends on the temperature and the humidity of the air going in. The constant movement of the air created by the blower – the cooling breeze it creates, makes the occupants of a room feel 4 to 6 degrees cooler than the actual temperature.
Evaporative air coolers works best in the hottest time of the day. As the temperature outside increases as the sun climbs, the humidity normally drops. In the early morning, for example, the temperature may be 70 degrees, with a relative humidity of 60 percent. By mid-afternoon, when the temperature has climbed to 90 degrees, the humidity may well have dropped to 30 percent – conditions that make evaporative cooling work more effectively.
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