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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| dehydration (drying) | removal of water from any substance |
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| deicing |
intentional melting of an ice layer |
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| demand (demand load) |
electric power delivered to or by a system, part
of a system, or a piece of equipment; expressed in kilowatts,
kilovolt-amperes, or other suitable unit at a given instant or averaged over
any designated period. |
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| demand limiter | electrical/electronic, mechanical, or electromechanical
device that monitors user electric power demand and causes that demand to be
limited in a manner not to exceed a selected or programmed maximum value |
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| demand-limit tripping (electric) | 1.
process of, or equipment for, automatically opening an electric-service
disconnect device
2.
removing interruptible or deferrable load(s) at the user level when electric
power or current flow to that user, or to a portion of the load, exceeds a
specified level for more than a specified time, as determined by agreement.
The automatic function can be enabled or disabled remotely by the serving
utility via centralized communication. |
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| demodulation |
modulation process wherein a wave resulting from
previous modulation is employed to derive a wave having substantially the
characteristics of the original modulating wave; sometimes used to describe
the action of a frequency converter or mixer, but this use is deprecated. |
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| density |
1. mass per unit of volume.
2.
measure of the light transmitting or reflecting properties of an area. Compare
specific gravity. |
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| desiccant |
absorbent or adsorbent, liquid or solid, that
removes water or water vapor from a material. |
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| desiccation | 1. process for evaporating water or removing
water vapor from a material. 2. complete removal of water from a material |
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| design airflow | required airflow when the system is operating
under assumed maximum conditions of design, including diversity |
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