Air Conditioning


Cooling
In 1900 there is very little people could do within a hot spell except grumble in regards to the weather or -if they can afford it -go away to the mountains or the seashore. Today air-con has changed this. With air cooling has changed this. With air cooling you can be comfortable anywhere indoors on the hottest, stickiest day of 4 seasons. You will almost certainly find ac in the movie theaters you attend, in many of the stores where all your family members shops, and in the restaurants in places you eat. It may be in your own home.

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

In dry climates air can be cooled simply. The cooler could possibly be no more than a large fan that attracts hot, dry air into a water soaked fiber mat. Mid-air is cooled as it evaporates the water. It is do dry to begin with that the added moisture will not likely cause discomfort. (It's not the case in humid climates)

Air cooling has many uses besides keeping us comfortable. Many industries rely on it to keep air in their plants clean, cool at the right moisture level. For instance, textile fiber such as wool and cotton will stretch or shrink because the moisture content of air changes. This causes 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 like rocket components or precision instruments instrument to corrode. A bad temperature can spoil a batch of antibiotic culture. Proper air-con prevents this mishap.

The deep diamond and gold mines of Africa use air conditioning make it possible for miners to work in what would certainly be suffocating in heat, a large number of feet below the ground. Together with the air conditioning is associated with every part of the United States space program, from making missiles to tracking them through 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 on their entrances of their houses, therefore the air would be could by evaporation. From the 15th century A.D., the famous artist and inventor built water powered fan.

As men is desire for science grew so did the amount of schemes for getting cool. There was hundreds of ideas, but none of them of them really worked. In fact, many of the schemes made people feel worse because they added large amount of water towards the air. Air is sort of a sponge. It will absorb water and make people feel sticky and uncomfortable, especially in hot weather. When the air is extremely moist, we say the humidity is high. Once the air is dry, the humidity is low so we feel better.

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

Air conditioning was soon getting used in many factories, for example plants that made ammunition during Ww 1. But people generally did nit be familiar with this invention until 1920's, when a huge selection of movie theaters, department stores, and restaurants had air conditioners installed. People often got into these places simply to get relief from hot, muggy air outside.

Since the air conditioning became more popular during the 1930's, central heat and air systems were developed. This can cool the whole office or apartment building derived from one of centrally located unit, just as buildings were heated derived from one of big furnace within the basement instead of by little stoves in every room. During the same period small units that could 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 buildings and private homes, combined air conditioning units in one system.

What makes it Work?

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

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