Glossary
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The terms and definitions included
in this glossary were taken from "ASHRAE Terminology of Heating, Ventilation,
Air Conditioning & Refrigeration".
To access the complete glossary please
visit ASHRAE's Bookstore.
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| air tightness | qualitative term describing the integrity of the
building envelope relative to air permeation; the resistance of the building
envelope to the flow of air and entrained moisture. Compare air infiltration
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| air transport factor | ratio of the rate of useful, sensible heat
removal from the conditioned space to the energy input to the supply and return
fan motor(s), expressed in consistent units and within designated operating
conditions. See load, heating
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| air velocity |
rate of motion of air in a given direction,
measured as distance per unit time. See also velocity. |
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| air vent |
manual or automatic device for removing air from
circulating hot or chilled water systems; also used for removing air from steam
systems
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| air washer |
unit for spraying or atomizing clean water into
an air supply system; capable of heating, cooling, humidifying, or
dehumidifying the air, depending on whether the water is heated or chilled.
See scrubber.
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| air-bound system |
introduction of air causing either a flow
restriction or a malfunction of the system. |
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| air-change effectiveness |
average age of air that exits a building via all
routes, divided by the arithmetic average of the local ages of air, measured at
breathing height. See also ventilation effectiveness.
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| air-conditioning system |
assembly of equipment for air treatment to
control simultaneously its temperature, humidity, cleanliness, and
distribution to meet the requirements of a conditioned space. See air
conditioner. Compare air-conditioning process. |
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| air-curtain |
controlled stream of air moving across the
height and width of an opening with sufficient velocity and volume to reduce
the infiltration or transfer of air from one side of the opening to the other;
and to inhibit insects, dust, and debris from passing through; or both.
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| air-curtain unit | mechanical air-moving device designed to produce
an air curtain.
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