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air conditioning
Значение термина air conditioning в knolik
air conditioning - Air Conditioning
air conditioning - System by which the air in a room or building is rendered and maintained in perfect condition suitable for the comfort and health of persons in occupation. It also applies to obtaining the exact temperature and relative humidity of the air required in a room or factory when special materials are in the process of manufacture or kept in storage. For cinemas, theatres, and public halls air conditioning plants are in some districts compulsory, and many hotels provide this method of warming or cooling and ventilating in their principal rooms. Rly. coaches in the U.S.A. and elsewhere are also air conditioned.
An air conditioning plant provides that the incoming fresh air is cleansed, warmed or cooled to a definite temperature, humidified or dehumidified, and, if required, treated chemically to disinfect or deodorise. Complete air conditioning should control simultaneously temperature, humidity, volume, air movement, air distribution, and the elimination of dust, bacteria, odours, and toxic gases. Taking, for example, a suitable air conditioning plant for a cinema, a centrifugal fan capable of delivering 1,000 cubic feet of fresh air per hour per person (according to seating accommodation) discharges conditioned air through sheet metal or built duds into the building. The fresh air is drawn from outside the building, and passes through a filter consisting of perforated metal trays coated with viscous oil. These trays are easily cleaned when dust accumulates on them. The air then passes through the air conditioning chamber, which is built of light metal sheets, enclosing steam or hot water batteries of special radiators or gilled pipes for warming the air, and water sprays for washing or cooling and humidifying, while for special cooling a refrigerating coil may be incorporated in the conditioning chamber. Automatic controls may be provided to regulate the temperature of the air delivered and the relative humidity, also to regulate the supply of steam or temperature of the water in the heater batteries. Extract ventilation at about 75 per cent of the volume of air delivered may be used in conjunction with the air conditioning plant.
A small all-electric air conditioning unit is obtainable for use in single rooms. Contained in a neat casing are a motor-driven fan, a box filter, ail electric heating element, a water tank with electric immersion heater to humidify the air, and a compressor refrigeration plant for cooling.
By L. J. Overton
Рядом со словом air conditioning в knolik
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