Thursday, December 14, 2006

Gas Compressors

Gas compressors are mechanical devices that store large quantities of gas inside a tank that occupies a very small volume. There are many different types of gas compressors that feature different abilities and properties. Gas compressors are used from homes and small corporations as well as huge industries and larger operations.

Normally, gas tends to occupy as much space as possible. That is, if a small amount of gas is placed inside a bottle, it will occupy the whole bottle. At the same time, if you place the same amount of gas inside a closed stadium, it will occupy the whole stadium. The compressor takes in gas and forces it to stay inside a tank. Gas compressors can achieve such a high compression rate that even minor damage to the tank of the compressor might result in a strong explosion.

According to physics laws, when gas takes up less space, it tends to produce heat. The pressure in a compressor can be hundreds of times greater than the atmospheric pressure. The problem of heat production is resolved by achieving the final compression on a per-stage/level basis. This means that for a typical gas compressor, which produces pressure 343 times the atmospheric pressure, the compression procedure is divided into three stages. In each stage, the compressor achieves a 7:1 compression ratio, and the gas is simultaneously cooled. This totals a compression pressure that is 7^3 (343) times higher than the normal atmospheric pressure.

Gas compressors are essential parts of gas turbines, jet engines, water turbines, steam turbines, petrol/diesel engines, and automobile superchargers/turbochargers. Additionally, gas compressors are used in air conditioning and refrigeration.

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Geothermal Heat Pumps

Geothermal heat pumps use the earth’s natural heat to circulate water or refrigerant between an underground network of pipes and heat pumps located inside the house. Although geothermal heat pumps are similar to ordinary heat pumps, they only differ in their usage of the ground instead of outside air to provide heating and air conditioning. The principle behind geothermal heat pumps is that in winters, the pumps move the heat from the earth into your house and in summers, the devices pull heat from your home and discharge it into the ground.

As geothermal heat pumps mostly use renewable energy from the ground, these heat pumps are among the most efficient and comfortable heating and cooling technology. Although geothermal heat pumps are costlier to install than regular heat pumps, the U.S. Environmental Protection Agency estimated that geothermal heat pumps can also lower energy bills by 30 to 40 percent. Additionally, geothermal heat pumps are mechanically simple and most of their parts remain below the ground and are protected from the weather, thus reducing maintenance costs as well. Geothermal heat pumps are also included in the types of products rated in the EnergyStar program by the U.S. Environmental Protection Agency for being an environmentally friendly invention.

Geothermal heat pumps are durable, comfortable, environmentally safe, non-allergenic and clean. Such heat pumps not only lower your heating and cooling bills, but also require minimal maintenance. Geothermal heat pumps provide the utmost comfort by heating and cooling in an even fashion and eliminating hot and cold spots. Such heat pumps are also environmentally safe, as they minimize environmental threats posed by the burning of fossil fuels, like acid rain, air pollution, and the greenhouse effect.

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