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A Guide to Evaporative Coolers PDF Print E-mail
Written by Administrator   
Thursday, 24 June 2010 11:12
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Splash water on your face on a hot day in summer and you will immediately feel cooler. Evaporative cooling is working. An evaporative cooler works on the same principle - water evaporation provides cooling - but they combine with water evaporation air flow to cool our homes.

Evaporative coolers are sometimes called "swamp coolers," probably because they add moisture to the air, making it more "marsh etc.." The concept of evaporative cooling has been around for years, when people living in arid climates used to hang wet clothes in their windows at night, knowing the breeze blowing through the window to help cool the room.

How do they work?

Although evaporative coolers have passed the "hanging a sheet in the window" stage, the principle remains the same. Today, an evaporative cooler is usually composed of a large box containing a fan surrounded by a moist pad mounted on the roof or side of a house. A pump circulates the water to keep the pad moist air from the fan blows through the pavement. The moist (but cooler) air is blown into the house to drive the most heartwarming of air through open windows or vents.

The U.S. Department of Energy, the difference in temperature between indoor air and cooled air can be expected to be in the range of 15-20 degrees, but the difference can be as high as 40 degrees under certain conditions. As a bonus, coolers provide further cooling effect, since the constant air movement caused by the cooler fan actually allows the temperature of a room feel even cooler.

Coolers vs Air

Although the two evaporative coolers and air-conditioners designed to do the same thing - cool our homes - evaporative coolers are definitely low tech and unlike air conditioners in many ways. To begin, coolers add moisture to the air, while air conditioners remove humidity. They do not use refrigerants (eg Freon), so they are not potentially dangerous to the atmosphere. evaporative coolers provide a constant supply of fresh air, while an air conditioner works best in a closed environment and recirculate the same air over and over. Air conditioners also cost significantly more expensive to install and maintain than evaporative coolers and use three to four times more electricity to operate.

Sizing of an evaporative cooler

The size of an evaporative cooler is measured in cubic feet per minute (CFM), or the number of cubic feet of fresh air can move in a minute. Household units are usually available in sizes from 3000 to 25,000 CFM CFM. Manufacturers recommend a size measure should be able to change the air in a home 20-40 times in an hour. You can determine the appropriate size unit for your home by calculating the cubic feet per house (ie, 1500 square foot house is 8 feet ceiling is 12,000 cubic feet) and dividing that number by 2. So in this case, the 12,000 cubic foot house will require a 6000 cfm evaporative cooler.

Advantages of evaporative cooling

There are a number of economic and ecological benefits of using an evaporative cooler. For example:

* Evaporation coolers use much less electricity than an air conditioner for the house of the same size (some estimates are up to 75 percent less).
* Evaporation coolers use simple technology and is therefore much cheaper to buy, install and maintain. In addition, they operate on ordinary household current so they do not need a dedicated circuit.
In * dry climates, moisture, adding to the air may help keep the furniture and fabrics from drying out.
The wetland buffer * in the cooler air act as filters, helping protect it from dust and pollen from home whilst ensuring a continuous supply of cool air into the house.
Evaporative coolers are * still available in the window small and mobile units which can be used to cool a single room.

Sounds great! Why not use them anywhere?

* Unfortunately, evaporative coolers work best when they get in the air is dry. As the humidity increases in outdoor air, the effectiveness of evaporative cooling down. In reality, coolers work best in certain areas such as south-west or where the climate is arid and dry air. In areas with higher humidity, evaporative coolers are not really an option because they actually add moisture to the air and there would be no cooling effect.
* Another disadvantage of evaporative coolers is that they use a large amount of water (up to 15 gallons per day) to provide their cooling effect. In dry areas, the use may adversely affect real water.

Despite the fact that evaporative coolers can not be an option for cooling all of us, there is no doubt that they will provide energy savings and reduce the risk of environmental damage. So even if we all can not use an evaporative cooler, we do all benefit from the energy conservation and environmental protection they provide.

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