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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| induction unit |
air terminal device that delivers a small
quantity of conditioned (primary) air through high-velocity jets, to induce a
large quantity of room (secondary) air into the supply airstream. A heating
coil may be located in the primary or secondary airstream. Primary air often is
predominately outside air. Units generally discharge directly through a grille
into the space due to limited downstream static pressure capability |
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| inductive load |
alternating current load in which current lags
voltage |
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| infiltration degree-day (°F-day; °C-day) |
measure of the severity of the climate as it
relates to building air infiltration |
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| infrared (IR) radiation |
range of electromagnetic radiation wavelengths
greater than those of visible light and shorter than those of microwaves;
generally between 0.8 micrometre and 1 millimetre. IR originates from either
incandescent or nonincandescent hot bodies or from flames. The energy is used
as a means of direct heat transfer from the source to the object(s), to be
heated without materially heating the intervening air. |
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| infrared (thermal) resolution |
measure of the capability of an infrared sensing
device to distinguish the apparent radiance temperature difference between two
blackbodies near the same temperature. |
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| infrared CO2 meter |
instrument for estimation of carbon dioxide
content, based on absorption of infrared radiation. |
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| infrared detector |
device that transduces the infrared irradiance
incident on it into some other form of energy, in most cases electrical |
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| infrared imaging system |
apparatus which converts the two-dimensional
spatial variations in infrared radiance from any object surface into a
two-dimensional thermal map of the same scene in which variations in radiance
are displayed in gradations of gray tone |
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| infrared noise | equivalent temperature difference measure of the
(electric) noise of an infrared imaging system or line scanner; the
target-to-background temperature difference between a low spatial frequency
blackbody target and its black-body background at which a ratio of one is
obtained between the peak-to-peak signal and RMS noise at the output of the
detector processing electronics of the sensor in question. |
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| infrared panning | infrared surveying procedure in which an
infrared device is moved back and forth across a subject surface thereby
permitting thermal anomalies to be identified |
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