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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| thermal radiant flux density |
rate of radiant
energy emitted from unit area of a surface in all radial directions of the
overspreading hemisphere. See also radiant flux density. |
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| thermal radiation |
transmission of
energy by means of electromagnetic waves emitted due to temperature. Radiant
energy of any wavelength when absorbed may become thermal energy that increases
the temperature of the absorbing body. See also heat transfer radiation
coefficient. |
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| thermal reflectance |
fraction of the incident
radiation on a surface that is reflected from that surface. Note: For an opaque surface, the sum of
reflectance, transmittance, and absorptance is unity at any wavelength of
radiation |
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| thermal reflection |
portion of the radiosity
from a surface which is contributed by reflection |
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| thermal regenerator (thermal recuperator |
heat transport
apparatus designed for utilizing waste heat. Heat transport is achieved either
by accumulation of heat in a suitable material through which alternately pass a
warm fluid and the fluid to be heated, or in a heat exchanger where both fluids
circulate counterflow. See heat exchanger. |
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| thermal relay |
1. relay activated
by change in temperature.
2. relay in which the displacement of the moving
contact member is produced by heating of a part of the relay under the action
of electric currents. |
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| thermal resistance (R-value) |
under steady
conditions, the mean temperature difference between two defined surfaces of
material or construction that induces unit heat flow through unit area. Note: Thermal resistance and thermal
conductance are reciprocals. Thermal resistances are R‑values; to obtain the U‑factor,
overall thermal transmittance, the R‑value for either materials or
constructions must first be evaluated because, by definition, the U‑factor is
the reciprocal of the R‑value. |
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| thermal resistivity |
under steady
conditions, the temperature difference between parallel surfaces of a slab
(large enough so there is no lateral heat flow) of unit thickness that induces
unit heat flow through unit area. Note:
Thermal resistivity and thermal conductivity are reciprocals. Thermal
resistivity is the R‑value of a material of unit thickness. |
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| thermal sensation | conscious feeling,
commonly graded into categories of cold, cool, slightly cool, neutral, slightly
warm, warm, and hot |
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| thermal shroud |
in a space simulator,
surfaces (usually blackened) cooled to very low temperatures, which surround
the test object |
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