radiant emissivity

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• Radiant barrier — Radiant barriers or reflective barriers work by reducing heat transfer by thermal radiation. All materials give off, or emit, energy by thermal radiation as a result of their temperature. The amount of energy emitted depends on the surface… …   Wikipedia

• Emissivity — The emissivity of a material (usually written ε or e) is the relative ability of its surface to emit energy by radiation. It is the ratio of energy radiated by a particular material to energy radiated by a black body at the same temperature. A… …   Wikipedia

• emissivity — The giving off of heat rays; a perfect “black body” has an e. of 1, a highly polished metallic surface may have an e. as low as 0.02. * * * emis·siv·i·ty .em ə siv ət ē, .ē .mis iv n, pl ties the relative power of a surface to emit heat by… …   Medical dictionary

• emissivity — noun (plural ties) Date: 1880 the relative power of a surface to emit heat by radiation ; the ratio of the radiant energy emitted by a surface to that emitted by a blackbody at the same temperature …   New Collegiate Dictionary

• emissivity — /em euh siv i tee, ee meuh /, n. Thermodynamics. the ability of a surface to emit radiant energy compared to that of a black body at the same temperature and with the same area. [1875 80; EMISSIVE + ITY] * * * …   Universalium

• Emissivity —   The ratio of the radiant energy (heat) leaving (being emitted by) a surface to that of a black body at the same temperature and with the same area; expressed as a number between 0 and 1.   ***   The property of emitting radiation; possessed by… …   Energy terms

• emissivity — em•is•siv•i•ty [[t]ˌɛm əˈsɪv ɪ ti, ˈi mə [/t]] n. thr the ability of a surface to emit radiant energy compared to that of a black body at the same temperature and with the same area • Etymology: 1875–80 …   From formal English to slang

• Mean radiant temperature — The Mean Radiant Temperature (MRT) is a concept arising from the fact that the net exchange of radiant energy between two objects is approximately proportional to their temperature difference multiplied by their ability to emit and absorb heat… …   Wikipedia

• Low-emissivity — (Low E) coatings are microscopically thin, virtually invisible, metal or metallic oxide layers deposited on a window or skylight glazing surface primarily to reduce the U factor by suppressing radiative heat flow. The principal mechanism of heat… …   Wikipedia

• R-value (insulation) — The R value or R value is a measure of thermal resistance (K·m²/W) [Oak Ridge National Laboratory, [http://www.ornl.gov/sci/roofs+walls/insulation/ins 02.html Which Kind Of Insulation Is Best?] , retrieved 2008 07 13.] used in the building and… …   Wikipedia

• Black body — As the temperature decreases, the peak of the blackbody radiation curve moves to lower intensities and longer wavelengths. The blackbody radiation graph is also compared with the classical model of Rayleigh and Jeans …   Wikipedia