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A header is a manifold, the purpose of which is to uniformly distribute coolant in pipe circuits in air coolers, dry coolers, evaporators and condensers.½
HCFC (Hydrochlorofluorocarbon)
CFC and HCFC refrigerants contribute to the breakdown of the ozone layer and the greenhouse effect. CFC is an abbreviation of chlorofluorocarbon; HFC is an abbreviation of Hydrochlorofluorocarbon. They describe the molecules’ atom content.
Heat exchanger
Heat exchangers are used in heating systems to separate two media, while at the same time transferring heat from one to the other.
Heat recovery
A great part of energy consumption in a ventilation system goes to heating outside air. Great reductions in operational expense can be achieved by transferring the heat from the expelled air to the cold air that is taken in.
Heat pump
A heat pump is a system that can both cool, heat, and dehumidify air in a room, depending on the demand. These systems have a reversible heat transfer cycle.
Heat requirement
A building’s heat requirement need is calculated based on its estimated heat exchange with the surroundings and the building’s users.
Heat transfer fins
Fins are used on all air coolers, dry coolers, evaporators
Heat rejection
Heat rejection is the excess heat from a cooling system which is removed by the condenser/cooling tower. Heat rejection is the total amount of heat energy which is transferred from the cool side to the warm side, plus the work carried out by the compressor.
HFC (Hydrofluorocarbon)
HFC as a refrigerant does not contribute to the breakdown of the ozone layer, but contributes to the greenhouse effect. HFC is an abbreviation of hydrofluorocarbon, and describe the molecules’ atom content.
Heating surface
The heating surface can be an integrated part of the AHU, or be placed directly in the air intake duct. The heating surface is used to warm up outside air before being injected into the building.