106 Cooling Equipment

The most common process for producing cooling is vapor-compression refrigeration, which essentially moves heat from a controlled environment to a warmer, uncontrolled environment through the evaporation of a refrigerant which is driven through the refrigeration cycle by a compressor.

Vapor compression refrigeration machines are typically classified according to the method of operation of the compressor. Small air-to-air units most commonly employ a reciprocating or scroll compressor, combined with an air-cooled condenser to form a condensing unit. This is used in conjunction with a direct-expansion (DX) evaporator coil placed within the air-handling unit.

Cooling systems for large non-residential buildings typically employ chilled water as the medium which transfers heat from occupied spaces to the outdoors through the use of chillers and cooling towers.

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