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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| aerosol |
small particles, solid or liquid, suspended in
air, e.g., dust, fumes, fog, and
smoke. The diameter of the particles may vary from micrometres (formerly
micron) down to less than 0.01 micrometre. See fumes |
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| AFD | adjustable-frequency drive |
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| AFUE | annual fuel utilization efficiency |
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| AGA |
American Gas Association
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| agitator |
device to create turbulent motion in a fluid,
usually inside a vessel. |
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| air |
the atmosphere; the mixture of invisible,
odorless, tasteless gases (nitrogen, oxygen, and others) that surrounds the
earth. |
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| air age (age of air) |
time of passage of air from one point to another
within an indoor space. See also air-exchange effectiveness |
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| air change |
introduction of new, cleansed, or recirculated
air to a space. |
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| air change rate |
airflow in volume units per hour divided by the building
space volume in identical volume units [normally expressed in air changes per
hour (ACH or ACPH)]. Mean air change rate over a specific period can be
measured using ASTM E 741-83, “Test Method for Determining Air Leakage Rate by
Tracer Dilution.” See also ventilating rate. |
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| air changes |
expression of the amount of air movement or air
leakage into or out of a building in terms of the number of building volumes or
room volumes exchanged.
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