ASHRAE Terminology

a unitary air conditioner, for a computer and data processing room, consisting of one or more assemblies that include a DX evaporator or chilled-water cooling coil, an air-moving device, and air-filtering devices. The air conditioner may include a compressor, condenser, humidifier, or reheating device.

a ratio calculated by dividing the net total cooling capacity in watts by the total power input in watts (excluding reheaters and humidifiers) at any given set of rating conditions. The net total cooling capacity is the total gross capacity minus the energy dissipated into the cooled space by the blower system.

an air cooler or an absorption or adsorption device used for lowering moisture content.

device that injects steam directly into the airflow.

device to add moisture to air or gases.

apparatus using centrifugal action to atomize and distribute moisture into an airstream.

orifice through which liquid is sprayed as in air washers and humidifiers.

(1) air-conditioning unit designed primarily for cooling and dehumidifying air by passing the air over cooling coils that are below the dew point of the air. (2) dehumidifier with a surface at a temperature below the dew point.