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Industrial Air Conditioner Terms

Accumulator – A shell-shaped device that is incorporated into an HVAC (heating, ventilation, air conditioning) system within the suction line in order to protect the compressor from liquids.

Active Cooling – Air-conditioning driven by a compressor.

Adsorption – Drying air or gas by holding moisture vapor on a desiccant surface without mixing with its molecular structure.

Air Handler – The indoor unit of an air conditioning system that provides conditioned air into a space. An air handler consists of a heat exchange coil, filters and a fan.

BTU (British Thermal Unit) – A unit of measurement of heat or energy. One BTU is the amount of heat needed to raise or reduce the temperature of one pound of water by one degree Fahrenheit.

Capacity – The maximum amount of heat energy that can be removed from or added to a medium by an HVAC system.

Compressor – Also referred to as the "heart" of a refrigerating or a/c system, a compressor is a pump that uses pressure to move refrigerant through pipes between an outdoor condensing unit and an indoor evaporating unit.

Condensation – The process of changing air into liquid.

Desiccant – A substance suitable for absorbing and adsorbing moisture.

District Heating and Cooling – The utilization of a central utility system to heat or cool large residential and industrial areas.

Duct – A device used to distribute air.

Filter – A device used for the removal of solid and liquid particles.

Gravity Cooling – Cooling with an evaporator that does not have a fan to circulate the air.

Heat Exchanger – (http://www.heatexchangers.org) A device capable of transferring heat from one place or medium to another.

Absolute Humidity – Mass of water vapor present per unit volume of air, usually measured as grains/ft3, lbs/ft3 or grams/ft3.

Inlet Pressure – The total pressure at the inlet flange of the compressor.

Load – The required rate of heat removal.

Moisture Separator – A device that separates condensate from an air stream.

Precooler – A heat exchanger that lowers the temperature of the inlet air with the help of the outgoing cold air. In the process, the outgoing air is reheated by the incoming air.

Refrigerant – The medium of heat transfer in a refrigeration system that picks up heat by evaporating at a low temperature and rejects heat by condensing at a high temperature.

Silica Gel – A regenerative desiccant.

Vapor Pressure – The pressure exerted on a liquid and vapor surface.