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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You can always search for terms. |
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| U |
| Pages: 1 |
| U-value | improper terminology. Use
U-factor. See thermal transmittance |
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| UL (ULI) | Underwriters’
Laboratories, Inc. (ULC) Underwriters’ Laboratories, Canada |
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| ultraviolet (UV) radiation |
range of
electromagnetic radiation wavelengths from about 400 nm, just beyond the violet
in the visible spectrum, to about 4 nm, on the border of the x-ray region. UV
photons have enough energy to initiate some chemical reactions, to degrade most
plastics, and to kill microorganisms. |
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| unconditioned space |
space within a
building that is not conditioned space. Compare conditioned space. |
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| uniform velocity | smooth, straight-line
motion of gas or liquid across the area of flow |
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| unit |
1. factory‑made encased assembly of the
functional elements indicated by its name, such as air‑conditioning unit, room‑cooling
unit, humidifying unit, etc. 2. portion or subassembly
of a computer which constitutes the means of accomplishing some inclusive
operation or function |
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| unit point selector |
device which selects the
monitoring points to be used for observation or data sensing and collection |
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| use factor | percent capacity realized,
time that a system is operated. Compare diversity factor |
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| utilization factor |
same as use factor |
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