thermal emissivity


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thermal emissivity

[′thər·məl ‚ē·mi′siv·əd·ē]
(thermodynamics)

thermal emissivity

The ratio of the rate of radiant heat energy emitted by a body at a given temperature to the rate of radiant heat energy emitted by a blackbody, 1 at the same temperature, in the same surroundings.
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(6,13) Since metals have relatively low thermal emissivity values, absorber coatings are prepared mainly on metallic substrates (Al, Cu), which inherently have high thermal conductivity and good corrosion resistance.
Pay attention to reflective roofs that are designed to reduce heat gain by using both solar reflectivity and thermal emissivity to remain cool.
It has been well-established in experimental physics that the thermal emissivity of a material is directly linked to its structure [71].
The data suggest that due to the low thermal emissivity, steel roof coatings quickly react to the thermal effects of solar radiation and their temperature variation repeat the complexion of the solar radiation intensity variation.
[18.] Van de Griend AA and M Owe On the relationship between thermal emissivity and the normalized difference vegetation index for natural surfaces.
The coating is called Low-E coating, or low thermal emissivity coating.
On the relationship between thermal emissivity and the normalized di_erence vegetation index for natural surfaces.
The Material and Coatings Laboratory of the Thermal Control Services of CNES-Toulouse, has developed a 'cold' coating, with low solar absorbance and high thermal emissivity, which can be flexible or rigid, known under the trade name of FSR (Flexible Solar Reflector) or RSR (Rigid Solar Reflector).

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