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/cloth ratio (feet per minute) |
value used in dust collector calculations to
measure air velocity through the bag filter media. Note: Calculated by dividing active cubic feet per minute of
airflow by the effective area (square feet) of the cloth media |
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| air/media ratio |
same as air/cloth ratio, but used where
non-cloth bag media, such as paper cartridges, are the filter media.
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| airborne particles (particulates) |
impurities as solid or liquid particulate
matter from whatever source
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| airborne sound |
sound which reaches the point of detection by
radiation through the air. |
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| airflow | movement of air, usually within boundaries such
as ducts
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| airflow resistance | deterrent (due to friction, change of direction,
etc.) to the passage of air within a system of airways or an apparatus
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| airflow retarder | material or construction which adequately
impedes transmission of air under specified conditions. Compare structural
barrier; water-vapor retarder
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| airfoil | fan shaped blade (backwardly inclined or forward
curved) in a fan assembly to optimize flow, with less turbulence |
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| alarm |
1.
signal, either audible or visual or both, which alerts an operator to an off‑normal
condition which requires some form of corrective action.
2.
off‑normal condition such as a pressure, temperature, etc., that has deviated
above or below an established operating range.
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| albedo | ratio of reflected solar radiation from a
surface and the incident solar radiation. See also reflectance
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