Air coolers, also called evaporative coolers or swamp coolers, cool the atmosphere by evaporating water. When the air flows over the water surface, certain particles on the water surface will be taken away. These particles take away heat, thereby cooling the air. This is the main mechanism behind the air cooler. Keep reading the article to learn more about them.

Sweating has the same effect: the water particles on the skin's surface take away heat as they evaporate, cooling the skin. As we all know, these air coolers can reduce energy use by 75% compared to central air conditioners.

There are many styles of evaporative coolers. In some methods, a fine mist is sprayed into the air and then blown out by a fan. Since the water in this mist is composed of fine water droplets, it is easy to evaporate and absorb heat from the air. In some other methods, air is blown through the wetted material. For example, it can be blown through a fine mesh or wet sheet. This wet material then cools as it evaporates, which in turn cools the air.

Depending on the temperature, the air can only retain a certain amount of moisture. When the temperature exceeds this amount, the water starts to condense from the air at the same speed as it evaporates into the air, thereby effectively preventing evaporative cooling.

Direct evaporation is used in residential and industrial state conversion coolers, which are described as internal metal or plastic boxes with ventilated sides. The centrifugal fan or blower drives the air, and the water pump wets the evaporative cooling pad. The cooling device can be installed on the roof, exterior wall or window of the building. The fan draws near air through the vents on the side of the device and the damp cushion to keep it cool. The heat in the air evaporates the moisture in the board, and the board is constantly re-moisturized to keep the cooling process going.