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 density | mass per unit volume of air
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| air diffusion performance index (ADPI) | single number rating of the air diffusion performance
of a system of diffusers, as installed, at a specified air delivery rate,
temperature, and moisture content.
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| air discharge coefficient | ratio of the net area at vena contracta of air
flowing through an orifice to the total free area of the opening
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| air distribution envelope |
surface or locus of points of equal velocity
which describes an air distribution profile.
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| air drop |
vertical distance between the base of an air
outlet and the bottom of the airstream at the end of the air throw. Note: Drop occurs from the natural
expansion of the airstream.
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| air duct (trunking) | major conduit in an air-conveying system,
usually rectangular or circular in cross section
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| air dumping | rapid falling of cold air that occurs when a
variable air volume (VAV) box or other device reduces airflow, and the supply
air leaves the diffuser at very low velocity
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| air eliminator (air vent) | in a steam or water distribution system, a
device which closes if either steam or water is present in the vent body, and
opens when air or noncondensables reach it
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| air entrainment |
capture of part of the surrounding air by an
airstream discharged from an outlet; sometimes called secondary air motion.
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| air exfiltration | air leaking outward |
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