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cooling tower, and human skin, work on the same principle. The

principle is
href="http://www.evaporative-air-coolers.com">evaporative

cooling. Water is broken down into smaller droplets and air

forced through it. Heat transfer takes place from water to air

or air to water depending on the design of the equipment. In

human skin, the heat is taken away from the body when sweat on

surface of skin evaporates.







Construction Of Swamp Coolers







The swamp coolers consist of a box and a fan is situated inside

the box. On the suction side of fan, there are pads. These pads

are made of wood shavings or PVC. A small water pump directs

water on top of the pads. The construction of pads is such that

the incoming water is broken down into small water droplets and

air going to suction of fan goes through these small droplets.

So in essence, it is just a box with a pump and a fan & lot of

pads for breaking water into smaller droplets. The construction

might also include a distributor for air delivery so that the

air is equally distributed in all areas of the room.







Other variations include a common motor for pump and fan, thus

further reducing construction complexity









The controls of swamp coolers include controls for fan speed, a

float valve for maintaining water level in the basin of cooler

and controls for air delivery. Some
href="http://www.evaporative-air-coolers.com/portable-swamp.html"

>portable swamp coolers have water level indicators instead

of float valve and water level has to be maintained by pouring

water from outside.







Condition affecting performance







There are no controls for temperature of outgoing air since it

cannot just be controlled. It is a "take it or leave it' type of

machine with absolutely no control on the out let air

temperature. The out let air temperature is the result of

atmospheric air temperature and atmospheric humidity. The lesser

the relative humidity, the higher is the performance for a given

inlet temperature. At the same relative humidity, higher inlet

temperature increases the cooling ratio. Therefore, you can see

that the air-cooling cannot be controlled. If this is the case,

why have a swamp cooler at all? The answer is, air conditioning

was invented about in1902 and there was no choice before it. Now

it is a question of money. If you wish to have a low initial

cost and low operating cost solution, swamp cooler is the only



alternative.







How to choose your swamp cooler







The capacity of swamp coolers is on cubic feet per minute (CFM)

capacity of air delivery fan. If the room dimensions are 15 feet

by 12 feet and 8 feet high, then room capacity will be 15*12*8 =

1358 cu ft. The fans are designed to have complete change of

room air every 5 minutes. This means that the capacity of fans

will be 1358 divide by 5, or approximately 280 CFM. This

capacity is for a fan that draws cold air from the room. If the

same swamp cooler is fixed in a window, the capacity will

increase, as recirculation will be reduced to zero.







About the author:



Matt Anderson adds regularly reviews on air conditioners to

http://www.evaporative-air-coolers.com . An online information

magazine about the basics of how evaporative air coolers work

and some of the advantages of the technology for a good home air

conditioning. Find your swamp cooler at

http://www.evaporative-air-coolers.com/swamp-coolers.html

Matt AndersonConstruction Of Swamp Coolers

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