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Air-conditioning, how air-conditioning systems work?

Air-conditioning is a method for controlling the quality of air in buildings and rooms. Most homes and offices, particularly in skyscraper blocks and other modern buildings, are air-conditioned. Air-conditioning controls the humidity (dampness) and temperature of air. It also cleans the air of harmful substances, such as soot, dust and pollen, and keeps the air circulating to prevent staleness. Air-conditioning systems are adjusted to provide a balance of temperature and humidity that is comfortable and healthy. In hospitals and public places, air may also be sterilized (made germ-free).

how air-conditioning systems work?

Air-conditioning, how air-conditioning systems work?

Air-conditioners take air from outside a building, or a vehicle, and treat it for use inside. They cool and dry the hot humid air that often occurs in summer. They may also warm and add moisture to the cold dry air of a bitter winter. In summer, air passing through the air-conditioner is cooled by a spray of cold water or by a refrigeration system like that used in a refrigerator (see Refrigerator). Cold air can hold less moisture than hot air, and if the hot air is humid, some of its moisture condenses as it cools. The air produced by the air-conditioner is refreshingly cool and dry.

In winter, many air-conditioning systems are used to heat cold air from outside. The air-conditioner contains heating elements to warm the air, and a water spray to put some moisture in it. Cold winter air is often bone dry and uncomfortable to breathe.

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