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 mass | totality of gas molecules in a defined volume of
air
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| air mass ratio | ratio of the mass of atmosphere in the actual
earth-sun path to the mass which would exist at sea level if the sun were
directly overhead
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| air motor |
1.
device which converts compressed air into mechanical force.
2.
air‑operated device that is used primarily for opening or closing dampers. 3. pneumatic operator, a final control device
that assumes a position as directed by an input-pressure signal |
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| air power (operational) | power required to move air at a given rate of
flow against a given resistance. The ratio of air power to input power of a
fan or blower is termed “efficiency.” |
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| air power (theoretical) |
power required to drive a fan or blower as
though there were no losses in the fan or blower (100% efficiency). |
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| air separation unit |
device used to remove air from another fluid
stream. See also purge.
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| air spread | divergence of an airstream after it leaves an
outlet
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| air supply fixtures | devices or openings through which air flows into
a room. See air outlet (inlet); diffuser; grille; perforated ceiling; register
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| air terminal device | device (e.g., a grille) placed in a duct opening
to a room, through which controlled air enters or leaves. See also terminal
device; VAV box
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| air throw (blow) |
horizontal or vertical axis distance an
airstream travels after leaving an air outlet before the stream velocity is
reduced to a specific, so‑called terminal value.
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