emissivity in A Sentence

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    Emissivity 18% Cover No. 1.

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    Efficiency Absorptivity ≥95%, Emissivity ≤4%.

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    Low-e(or low Emissivity) glass is used to reduce the sun's heating effect on the home(Photo: Scott Burrows).

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    The Emissivity of a material specifies how well a real body radiates energy as compared with a black body.

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    Through our main R&D of the temperature cycle system, plus the new materials, the Emissivity can reach more than 0.99.

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    The T-shirts(both the black and the white) have an Emissivity very close to 1- they don't really reflect much infrared radiation.

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    If an object is only radiating infrared light and not reflecting it at all, that would be an Emissivity of 1.

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    Emissivities at those wavelengths have little to do with visual emissivities(visible colors); in the far infra-red, most objects have high emissivities.

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    Low-e(or low Emissivity) glass has been used to reduce the sun's heating effect on the home, and thick stone walls help to maintain a steady temperature.

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    However, it is typical in engineering to assume that a surface's spectral Emissivity and absorptivity do not depend on wavelength, so that the Emissivity is a constant.

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    Although a black body is a theoretical object(i.e. Emissivity e = 1.0), common applications define a source of infrared radiation as a black body when the object approaches an Emissivity of 1.0,(typically e = 0.99 or better).

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    In other words, given the assumptions made, the temperature of Earth depends only on the surface temperature of the Sun, the radius of the Sun, the distance between Earth and the Sun, the albedo and the IR Emissivity of the Earth.

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    One study,[38] which analyzed the proposed 22 Bishopsgate tower in London, found that a 35% energy decrease in demand can theoretically be achieved through indirect solar gains, by rotating the building to achieve optimum ventilation and daylight penetration, usage of high thermal mass flooring material to decrease temperature fluctuation inside the building, and using double or triple glazed low Emissivity window glass for direct solar gain.

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