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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| addenda |
addenda set of revisions to a standard in the form of a
supplement |
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| adiabatic efficiency |
efficiency
with which work is done with respect to heat gains or losses. |
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| adiabatic exponent |
exponent k
in the equation pvk =
constant, representing an adiabatic change (k
is the ratio of the specific heat at constant pressure to the specific heat at
constant volume). |
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| adiabatic process |
thermodynamic process during which no heat is
extracted from or added to the system. |
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| adjustable-frequency drive (AFD) | electronic device that varies its output
frequency to vary the rotating speed of a motor, given a fixed input frequency.
Used with fans or pumps to vary the flow in the system as a function of a maintained
pressure
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| ADPI |
air diffusion performance index |
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| adsorbent |
material that has the ability to cause molecules
of gases, liquids, or solids to adhere to its surfaces without changing the
adsorbent physically or chemically. Certain commercially available solid materials,
such as silica gel, activated carbon, and activated alumina, have this
property. |
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| adsorption |
1.
process in which fluid molecules are concentrated on a surface by chemical or
physical forces, or both.
2.
surface adherence of a material in extracting one or more substances present in
an atmosphere or mixture of gases and liquids, unaccompanied by physical or
chemical change.
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| aeration | exposing a substance, or area, to the circulation
of air
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| aerodynamic excitation |
time varying loads acting on the blades of a fan
due to nonconformities of the air flow. Note:
Spatial nonuniformities of airflow which are steady in time give rise to
harmonic excitation at frequencies which are integer multiples of the rotation
rate of the fan. Time excitations of the airflow give rise to random excitation.
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