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10 Mar 2016
In 1900 there was clearly very little people could do during a hot spell except grumble concerning the weather or -if they might afford it -go away to the mountains or the seashore. Today air cooling has changed this. With ac has changed this. With air-con you can be comfortable anywhere indoors on the hottest, stickiest day of the year. You will almost certainly find ac in the movie theaters you attend, in lots of of the stores where all your family members shops, and in the restaurants in places you eat. It may be in your own home.

What is ac?
You know that air conditioning makes you feel cool. But air-con is more than just cooling. This means keeping the temperature and humidity (moisture content) of air in an enclosed space, whether it's one room or perhaps an entire building, at merely the right level to the comfort of the people inside. In addition, it means circulating the environment and adding moisture if necessary. In summer it indicates removing by passing the air over cold pipes that collect water through the air, much as drops of water condense on a cold water glass on the hot, damp day. Actually, we might almost state that air conditioning means creating a synthetic, comfortable climate. On this page we shall discuss only cooling.

In dry climates air could be cooled simply. The cooler may be no more than a large fan that attracts hot, dry air to a water soaked fiber mat. The environment is cooled mainly because it evaporates the water. It really is do dry to start with that the added moisture is not going to cause discomfort. (This is simply not the case in humid climates)

Ac has many uses besides keeping us comfortable. Many industries depend upon it to keep air in their plants clean, cool and also at the right moisture level. As an example, textile fiber such as wool and cotton will stretch or shrink since the moisture content of air changes. This leads to variations in the excellence of the cloth. Too much moisture in mid-air -or even on a worker's fingertips- may cause delicate metal parts including rocket components or precision instruments instrument to corrode. A bad temperature can spoil a mug of antibiotic culture. Proper ac prevents this mishap.

The deep diamond and gold mines of Africa use air conditioning allow miners to work in what would otherwise be suffocating in heat, thousands of feet below the ground. With the air conditioning is linked to every part of the United States space program, from making missiles to tracking them from the atmosphere.

Inventors have tinkered with strategies to air conditioning for years. Ancient Egyptians and Romans got a bit of relief from the heat by hanging woven mats soaked with water across to their entrances of their houses, hence 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 interest in science grew so did the volume of schemes for getting cool. There was hundreds of ideas, but none of them of them really worked. Actually, many of the schemes made people feel worse simply because they added large amount of water on the air. Air is like a sponge. It will take in water and make people feel sticky and uncomfortable, specially in hot weather. When the air is incredibly moist, we say humidity is high. In the event the air is dry, your humidity is low and that we feel better.

The first machine that kept moisture low or cooled the air at the same time was developed in 1902 by Willis H. Carrier who built is frequently called "the father of air-con." Carrier built this machine to get a printing plant in Brooklyn, Nyc, that had trouble printing coloured. Paper stretches once the air is damp and shrinks when the air is dry. Since each color needed to be printed separately, printing of various colors on the same notepad did not line up accurately as the papers change size between printings. Carrier's machine kept the level of moisture of the air constant by drawing mid-air over a row cold pipes that condensed excess moisture. This kept the paper at one size plus made the people in the plant feel cool. Carrier's invention marked the begin of scientific air cooling.

Air conditioning was soon being used in many factories, for example plants that made ammunition during Wwi. But people generally did nit find out about this invention until 1920's, when numerous movie theaters, department stores, and restaurants had air conditioners installed. People often arrived to these places in order to get relief from hot, muggy air outside.

Because air conditioning became more popular during the 1930's, central heat and air systems were developed. These can cool the whole office or apartment building derived from one of centrally located unit, just as buildings were heated in one big furnace within the basement instead of by little stoves in every room. During the same period small units that can air condition a single room were developed. After World War II large numbers of small units grew 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 system.

How can it Work?

An aura conditioning unit doesn't "add coolness" to the air. It removes heat. An aura conditioner works on the same guideline as a refrigerator-though it is not built to produce such low temperatures. Heat is obtained from the air by the rapid growth of a refrigerant (cooling substances) since it turns from a liquid at high pressure. An accompanying illustration shows periodic operations of a small home-type air conditioning equipment. Here the air is cooled directly with the machine. For the sake of the tranquility of, filter and motors are certainly not shown in this diagram. In large, central installations, for example those in office buildings and schools, a piece of equipment chills water that is piped with a series of coils. Air from building is drawn over this coils and circulated with the building blowers.

To be practical, a cloak conditioning unit must be able to maintain a steady temperature. Otherwise people will have to turn their units on / off continually as the temperature become too cold or hot. A stable temperature-regulating device called thermostat. The thermostat is placed at desired temperature. It then switches the cooling unit off and on as needed.


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