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Definition of Condensing unit

Condensing unit Definition from Encyclopedia Dictionaries & Glossaries
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In the refrigeration and air-conditioning industry, a "condensing unit" is a component of a cooling system. It consists of a refrigeration compressor, a condenser, the compressor start-up circuitry, a filter-drier, a refrigerant tank and possibly other components. All these components are mounted on one frame. This makes the installation of the unit easier and faster for the refrigeration engineer: the condenser size fits the compressor size, almost all necessary components are already fitted and needn't be ordered separately. At the same time, most condensing units are still versatile enough that they can be used both for air-conditioning and for liquid recooling.

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For other Condensers not involving heat transfer, see Condenser (disambiguation).
In systems involving heat transfer, a condenser is a device or unit used to condense a substance from its gaseous to its liquid state, typically by cooling it. In so doing, the latent heat is given up by the substance, and will transfer to the condenser coolant. Condensers are typically heat exchangers which have various designs and come in many sizes ranging from rather small (hand-held) to very large industrial-scale units used in plant processes. For example, a refrigerator uses a condenser to get rid of heat extracted from the interior of the unit to the outside air. Condensers are used in air conditioning, industrial chemical processes such as distillation, steam power plants and other heat-exchange systems. Use of cooling water or surrounding air as the coolant is common in many condensers.

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