In 1900 there is almost no people could do during a warm spell except grumble about the weather or -if they may afford it -go away to the mountains or the seashore. Today air-con has changed this. With air-con has changed this. With air-con you may be comfortable anywhere indoors on even the hottest, stickiest day of the year. You'll almost certainly find air-con in the movie theaters you attend, in lots of the stores where your household shops, and in the restaurants where you eat. It might even be is likely to home. Repair

What is air-con?
You know that air-con makes you're feeling cool. But air-con is more than just cooling. It indicates keeping the temperature and humidity (moisture content) of air in a specific space, whether it is one room or an entire building, at the ideal level for the comfort of the people inside. It also means circulating the air and adding moisture if necessary. In summer it indicates removing by passing the air over cold pipes that collect water from the air, much as drops of water condense on a cool water glass on a warm, damp day. Actually, we may almost claim that air-con means creating a synthetic, comfortable climate. In this informative article we shall discuss only cooling.

In dry climates air could be cooled simply. The cooler may be no higher than a large fan that draws hot, dry air to a water soaked fiber mat. The air is cooled as it evaporates the water. It is do dry to begin with that the added moisture won't cause discomfort. (This is not the case in humid climates)

Air con has many uses besides keeping us comfortable. Many industries depend about it to help keep the air within their plants clean, cool and at the proper moisture level. Like, textile fiber such as for instance wool and cotton will stretch or shrink since the moisture content of air changes. This causes variations in the quality of the cloth. A lot of moisture in the air -or even on a worker's fingertips- can cause delicate metal parts such as for instance rocket components or precision instruments instrument to corrode. The wrong temperature can spoil a group of antibiotic culture. Proper air-con prevents this mishap.

The deep diamond and gold mines of South Africa use air-con to enable miners to work in what can otherwise be suffocating in heat, a large number of feet below the ground. With the air-con is associated with every part of the United States space program, from making missiles to tracking them through the atmosphere.

Inventors have tinkered with ways of air-con for years. Ancient Egyptians and Romans got some rest from heat by hanging woven mats soaked with water across with their entrances of the houses, therefore the air would be could by evaporation. In the 15th century A.D., the famous artist and inventor built water powered fan.

As men is fascination with science grew so did the number of schemes to get cool. There have been a huge selection of ideas, but do not require really worked. Actually, lots of the schemes made people feel worse because they added large amount of water to the air. Air is just like a sponge. It'll take in water and make people feel sticky and uncomfortable, especially in hot weather. Once the air is extremely moist, we say the humidity is high. Once the air is dry, the humidity is low and we feel better.

The very first machine that kept the humidity low or cooled the air at once was developed in 1902 by Willis H. Carrier who built is usually called "the father of air conditioning." Carrier built this machine for a publishing plant in Brooklyn, New York, that had trouble printing in color. Paper stretches when the air is damp and shrinks when the air is dry. Since each color had to be printed separately, printing of different colors on the same sheet of paper did not line up accurately because the papers change size between printings. Carrier's machine kept the moisture amount of the air constant by drawing the air over a line cold pipes that condensed excess moisture. This kept the paper at one size and also made the people in the plant feel cool. Carrier's invention marked the begin of scientific air conditioning.

Air con was soon being used in many factories, such as for instance plants that made ammunition during World War I. But people generally did nit know about this invention until 1920's, when a huge selection of movie theaters, shops, and restaurants had air conditioners installed. People often arrived to these places just to obtain rest from hot, muggy air outside.

Since the air-con became very popular throughout the 1930's, central air-con systems were developed. These could cool the whole office or apartment building in one centrally located unit, just like buildings were heated in one big furnace in the basement as opposed to by little stoves in each room. During the exact same period small units that may air condition a single room were developed. After World War II many small units started to be used in private homes. A later development, used increasingly in public places buildings and private homes, combined heating and cooling units in one single system.

How can it Work?

An air-con unit does not "add coolness" to the air. It removes heat. An air conditioner works on the same basic principle as a refrigerator-though it is not designed to create such low temperatures. Heat is obtained from the air by the rapid expansion of a refrigerant (cooling substances) as it turns from a liquid at high pressure. An accompanying illustration shows the cycle of operations of a small home-type air conditioner. Here the air is cooled directly by the machine. For the sake of the simplicity, filter and motors aren't shown in this diagram. In large, central installations, such as for instance those in office buildings and schools, a machine chills water that's piped to a series of coils. Air from building is drawn over this coils and circulated through the building blowers.

To be practical, an air conditioning unit must manage to maintain a regular temperature. Otherwise people will have to turn their units off and on continually since the temperature become too cold or hot. A steady temperature-regulating device called thermostat. The thermostat is set at desired temperature. After that it switches the cooling unit on and off as needed.

The air-con systems of the future may work by what is recognized as thermoelectric. A thermoelectric unit is very small and very quiet. It is comprised of tiny "couples," each couple consisting of a pair of semiconductors and connected in parallel current. These couples produce cooling at one end and heating at other when direct flows through them. This is called Peatier effect. When the existing is reversed, the cooling and heating effects also reverse. Each time a way is located to create this tiny thermoelectric unit cheaply, they might cool and heat your entire house. Repair