emittance


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emittance

[i′mit·əns]
(thermodynamics)
The power radiated per unit area of a radiating surface. Also known as emissive power; radiating power.

emittance

The ratio of radiant flux emitted by a material to that emitted by a blackbody at the same temperature, under the same conditions.
References in periodicals archive ?
thick glass sheets each with a low-e coating with an emittance of 0.
The inputs were the optical and emittance values at normal incidence for the two panes of glass.
A comprehensive study conducted by Oak Ridge National Laboratory (ORNL) and the Cool Metal Roofing Coalition on the aged reflectance values for painted metal roofing and other roofing materials showed that solar reflectance and thermal emittance values of painted metal roofing degrade minimally over time.
These films and laminates are characterized by having at least one surface with an emittance of 0.
A solar collector having a copper tube on an aluminium sheet absorber with absorptance 94% [+ or -] 2% and emittance 5% [+ or -] 2% was used for this study (EnerWorks 2007).
Kraton Polymers tested the reflectance and emittance of its G1643 elastomeric roof coating formulation using ASTM C1549 and ASTM C1371 standards.
4])and [alpha] is the surface area-averaged emittance, which in this study was taken 0.
2] Average emittance is the same both in mannequin and actual body conditions.
Low emittance window glaze saves energy in both summer and winter, and state-of-the-art HVAC and plumbing equipment reduce the waste present in some old systems.
A "cool roof is achieved by maximizing the roofing materials reflectance in the visible spectrum and by maximizing its emittance in the infrared spectrum.