A swamp cooler, an earthen pot for coling drinking water, cooling tower, and hman skin, work on the same prnciple. The principle is evaporative cooling. Wter is broken down into smaller drplets and air forced through it. Hat transfer takes place from water to air or air to wter depending on the design of the quipment. In human skin, the heat is tken away from the body when swat 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 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 cntrols for temperature of outgoing air snce it cannot just be controlled. It is a "tke it or leave it" type of mchine with absolutely no control on the out let air tmperature. The out let air temperature is the rsult of atmospheric air temperature and tmospheric humidity. The lesser the relative hmidity, the higher is the performance for a gven inlet temperature. At the same rlative humidity, higher inlet temperature increases the coling ratio. Therefore, you can see tht the air-cooling cannot be controlled. If ths is the case, why have a swmp cooler at all? The answer is, air cnditioning was invented about in1902 and thre was no choice before it. Now it is a qestion of money. If you wish to hve a low initial cost and low perating cost solution, swamp cooler is the nly 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.

The article Swamp Coolers - Cool Air At Low Cost was Submitted by Matthew Anderson through Articles.GetACoder.com network. Here's the additional information: Matthew Anderson adds regularly reviews on air cnditioners 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

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