Category Archives: Cooling a Home: Swamp Coolers and Air Conditioning Units

Cooling a Home: Swamp Coolers and Air Conditioning Units

In hot areas, it is necessary to cool the interior of buildings. Modern buildings have cooling systems, commonlyreferred to as air conditioning or CA for short. An alternative system of cooling is a swamp cooler. Although it may seem primitive, a swamp cooler can be effective, and is almost always much cooler to operate an air conditioner.

Swamp coolers have been developed, not in wetlands, but in the desert. Rick Goettl, in the 20th century, perfected his homecooling in the southwestern Arizona desert. Although the company would later become a great air of Phoenixsupplier of packaging, which began with swamp coolers. These worked well in the hot, dry air, in ways you neverhave worked in the Midwest or the Deep South.

Swamp coolers work by the principle of evaporation. When water is evaporated using thermal energy to change state from liquid to gas. Like boiling water requires heat, evaporation requires heat. This heat is removed from the surrounding air. A swamp refrigerator is a big box with a sponge-like cushions that line the three sides and top. A big fan forms the fourth side.

The floor of refrigerator is a water collecting tray, which is introduced into the top of the pads. The water runs down the walls, keeping the pills saturated. The air flows through the walls of the refrigerator through the wet pads, and out through the fan, into the room. On a dry day, water in the pads evaporates quickly, keeping the pads and the air quite cold. On a humid day, water in the pads are not evaporate well, and the result is that the cooler temperature decreases only slightly, while humidify the air.

The air conditioning works in a completely different scientific principle, that of the gas law of Boyle. Increased gas pressure in achamber temperature will rise, if the chamber volume remains unchanged or decreases. The decrease of the pressuredecreasing temperature. This is why a child’s balloon feels cool immediately after deflation, and why get a bicycle pumphot, if the tire is inflated quickly.

An air conditioning unit using a fluid such as Freon having a boiling point close to the ambient temperature of a room. Apressurized freon compressor raising the temperature. The hot gas then run through a capacitor, which is like aradiator and allows heat to escape into the surrounding air (this part of the unit is outside the building). As the pressurized gasis cooled, condensed back to liquid. Now it is at high pressure, but the ambient temperature. The liquid passes through athe expansion valve, which decreases the pressure, resulting in a cold mixture of liquid and gas. The cold mixture is run through a evaporator, which is like a radiator, but working in reverse. As the hot air blows cold room for the coils, the fluid in the coils are reheated gas and the air is cooled and returned to the room through a duct. The hot Freon and then returns tocompressor and the cycle begins again.

In addition to cool the air in a room, an air conditioning unit also reduces humidity. This is because, as the hot airtemperature passes through the evaporator coils cool, moist air condenses on the coils, as well as water condenses on a coldglass on a hot day.

Freon compressor requires a lot of energy, plus the power required to run the fans which blow air over the evaporator and condenser. This means that an air conditioning unit is more expensive to operate than a swamp cooler.
However, an air conditioner can operate and cool a room, even when the air is humid, while a swamp cooler is based on dry airoperate effectively.


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