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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| deflector (turning vane) | fixed or adjustable device, usually in a duct,
to change direction of airflow |
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| defrosting | planned process to remove or prevent accumulation
of frost (ice) on coils of refrigerating units |
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| defrosting system |
equipment and controls designed to remove frost
(ice) from cooling coils of a refrigerating system. |
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| degradation |
failure of a superconductor to carry the current
which would be expected from a knowledge of the critical current field
relationship of that material. |
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| degree-day (DD) | difference in temperature between the outdoor
mean temperature over a 24-hour period, and the given base temperature of a
building space. Compare kelvin day |
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| degreening |
imposed transformation from a green color to a
yellow or orange color (especially with citrus fruits), due to destruction of
chlorophyll. |
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| degrees of freedom |
number of variables necessary to determine the
state of individual phases less the number of phases more than one. Equals two
plus independent components minus number of phases. |
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| dehumidification | removal of water vapor from air |
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| dehumidifier |
air cooler, or an absorption or adsorption
device used for lowering moisture content. |
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| dehumidifying effect |
mass of water condensed during cooling or the
equivalent refrigerating capacity expressed in terms of the latent heat of the
water condensed per unit of time |
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