Swamp cooler

In hot, dry climates an inexpensive alternative to air conditioning is the swamp cooler. In this device water continuously wets porous pads through which fans blow the hot air. The air is cooled as the water evaporates. Use the information in Tables 6.2 and 6.3 to determine how much water must be evaporated to cool the air in a room of dimensions 4.0 m X 5.0 m X 3.0 m by 20.°C. Assume that the enthalpy of vaporization of water is the same as it is at 25°C. 

In very dry climates, people have used latent heat to help cool buildings. Windcatchers, which are devices that draw hot air across water to cool the air down, have been used for centuries in Persia, now called Iran, and, in fact, are still used there. Evaporative coolers, sometimes called swamp coolers, are used today in hot, dry areas like the desert Southwest of the United States.They pull hot, dry air across filters soaked with water. As jthe dry aif passes through the filters, the water evaporates into the dry air. 

Because of latent heat, evaporation draws heat out of the air, cooling it down. Swamp coolers don t work in humid climates because very little of the water evaporates. 

On the other hand, the use of evaporative ( swamp ) coolers appears to decrease particulate matter indoors. For example, Quackenboss et al. (1989) report levels of PM25 and PM, in homes having such coolers (for both smokers and nonsmokers) that are about half that of homes without them. 

An alternative type of air conditioner used in certain areas of the country needs neither refrigerant gas nor lots of electricity to work. These evaporative coolers, or swamp coolers, take advantage of the cooling ability of evaporating water. 

In a third method, air passes through a coarse mesh absorbent material that is saturated with water. This system is widely used for cooling at nurseries. It is similar in principle to a "swamp cooler In this system (and the water atomizing system), the temperature of the supply water can be regulated to provide a measure of heating and cooling. Both systems also produce some freewater so provisions must be made for drainage. 

SWAMP COOLER - Evaporative type cooler in which air is drawn through porous mats soaked with water. 

Swamp Cooler - A popular term used for an evaporative cooling device. 

The B6596 HVAC system consists of six evaporative coolers, five unit heaters, several exhaust fans, and two circulation fans. The five evaporative coolers for the main facility and their associated ductwork into the building are located on the south wall of the building. The Chapel swamp cooler is located on the north wall of the Chapel. The unit electric heaters in both the main facility and the Chapel are located near the ridge of the respective roofs. The circulation fan for the main facility is located in the center of the north wall, while the circulation fan for the... 

The UV/O3 eleantng process was used in a stainless steel chamber and it was found that the stainless steel was corroding. The source of corrosion was traced to the chlorine used in the swamp coolers used to cool the production area. The UV was dissoeiating the chlorine molecule and the activated chlorine was reacting with the stainless steel. 

Water is not significantly cooled by exchanging sensible heat with cold air. Most of the cooling results from the humidification of the air. If you live in the Central Valley of California, your home is likely cooled with a "swamp cooler," rather than with a freon compressor. The water partially evaporates as it mixes with the dry air. The latent heat of evaporation of water is 1000 Btu/lb. If 2 percent of the water evaporates by contact with the cold air, the water loses 20 Btu/lb. The specific heat of water is one Btu/lb per 1°F. Thus, the water will be cooled by 20°F by evaporation. 

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