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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| Dewar (vacuum) flask |
silvered glass flask with double walls with the
space between them highly evacuated |
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| dial |
1.
(industrial control) a plate or disc, suitably marked, that serves to indicate
angular positions, as for example the position of a handwheel. 2. (automatic switching) type of calling device
used in automatic switching that, when wound up and released, generates pulses
required for establishing connections |
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| diaphragm | 1. bellows whose elastic deflection can be
increased by the use of corrugations.
2. flexible membrane separating two cavities.
3.
in pneumatics or hydraulics, the membrane separating the fluid pressure system
from the mechanical side. |
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| diathermanous | pertaining to the nature of a substance or a
space which allows the passage of heat (more particularly radiant heat |
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| dielectric strength |
maximum electric field that an insulator can
withstand without breakdown. |
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| differential |
1.
of a control, the difference between cut‑in and cut‑out temperatures or pressures. 2. range which the controlled variable must pass
in order to actuate the control element |
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| diffuse (flux) |
indicates that radiant flux propagates in many
directions as opposed to a single direction; as in a direct beam, which refers
to collimated flux |
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| diffuser | 1.
circular, square, or rectangular air distribution outlet, generally located in
the ceiling and comprised of deflecting members discharging supply air in
various directions and planes and arranged to promote mixing of primary air
with secondary room air. 2. duct of increasing area following the outlet
of a rotary blower so that the reduced velocity of the fluid will convert some
of the kinetic energy into pressure energy. See also air outlet. |
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| diffuser radius of diffusion |
horizontal distance (air throw) from a ceiling
air diffuser to the point of preset terminal velocity of the air. |
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| diffusion | 1. displacement of the molecules of a fluid
within another fluid. 2. distribution of air within a space by an
outlet discharging supply air in various directions and planes |
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