The Principles of Evaporative Cooling | Feng Shui Elements

April 3, 2012 by homeimprovementguru?

Evaporative coolers are widely used in the western United States, southern Australia and Iran, where the climate is hot and air is dry. Also known as swamp coolers in the USA, they are less expensive than air conditioners and run on four times less electricity. Although they are becoming popular in recent years, evaporative cooling has existed for as long as anyone can remember. This technology was used widely in the ancient Persian Empire. In those days, the Persians used to build air shafts on the roof of their house to pull in ir from outside, pass the same through a water container and send the cooled air into the house. Today, Iranians extensively use the more modern and efficient version of the same technology to cool their houses.

Evaporative coolers are widely used in places with hot and arid climate, such as the western United States, southern Australia and Iran. Also known as swamp coolers in the USA, they are cheaper than air conditioners and require less energy to operate. Although they are gaining wide popularity in recent years, evaporative cooling has existed for as long as anyone can remember. It was used widely in the ancient Persian Empire. In those days, the Persians used to construct air shafts on the roof of their house to pull in ir from outside, pass the same through water and blow the cooled air into the house. Today, Iranians extensively use the more modern and efficient version of the same technology to cool their houses.

While evaporative cooling has many industrial and commercial applications, its most common use is at homes to cool the warm air inside the rooms. Modern evaporative coolers basically consist of a source of water, a cooling pad made of excelsior (wood wool) or plastics and melamine paper, a pump to circulate the water through the cooling pad, and a fan to pull the air from outdoors. They can be placed on windows or ventilators. A typical home cooling system requires around 15 gallons of water a day. Today, some solar powered evaporative coolers use electricity generated by solar panels to run the fan and pump.

Evaporative coolers basically come in three types:

* Direct evaporative cooler (open circuit) draws air from outdoors through a cooler pad which absorbs its heat to change liquid water into water vapor. The cooled moist air is then blown into the room.

* Indirect evaporative cooler (closed circuit) works in the same way as the direct evaporative cooler. However, it uses some kind of medium to exchange heat so that the cooled moist air never comes in direct contact with the air in the room.

* Two-stage evaporative cooler, or indirect-direct cooler, is a combination of the above two systems. In this system air is pre-cooled before going through the moistened pad. It does not add as much moisture to the room air as the above two and is good for areas with less dry air.

Evaporative coolers differ from air conditioners in the following ways:

* Evaporative coolers use water and air while air conditioners use chemical substances.

* Evaporating coolers are not suitable for humid places as they add moisture to the air and make the place more humid and uncomfortable.

* In evaporative cooling the air is drawn from outside the room, whereas air conditioners draw air from inside the room.

* Evaporative coolers run on 4 times less electricity than air conditioners. They are also less expensive to install than air conditioners.

* Evaporative coolers are by nature harmless to the environment, whereas the compounds (refrigerants) used in air conditioners are harmful to the ozone.

If you?re looking for trusted ac and evaporative cooling services, check out air conditioning.

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