Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The quantity emitted (per unit area).

Etymologies

Sorry, no etymologies found.

Examples

  • During the 2010-2011 off-season, the ballpark roof of Chase Field was recoated with an Energy Star certified material which improves the ballpark roof's reflectivity rating and thermal emittance rating, which helps to reduce the heat island effect in downtown Phoenix.

    Allen Hershkowitz: The Greenest All Star Game Ever

  • It is also notable that the mean blackbody IR emittance of the Earth is around 10 micrometers, well within the 15 micrometer absorption peak of the CO2 IR spectrum. oldandrew

    On Thursday, the Legg report will be published along with...

  • It does indeed have three major absorption peaks that fall within the blackbody emittance spectrum of the Earth.

    On Thursday, the Legg report will be published along with...

  • Wherever mean value of emittance spectrum is, these wavebands cover only tiny part of cummulative emitted energy.

    On Thursday, the Legg report will be published along with...

  • Nick, mean value of blackbody emittance spectrum is hardly relevant given its very wide distribution, while absorbtion spectra of CO2 consists of few very narrow bands.

    On Thursday, the Legg report will be published along with...

  • But this idea is about not only the color of a roof but also its solar reflectance (SR) and thermal emittance (TE), which are rated on a scale of 0 to 1, with 1 being the most reflective or emissive.

    Buzzword: Cool Roof

  • Conventional roof surfaces have low reflectance (0.05 to 0.25) and high thermal emittance (typically over 80%) and heat up to 150 to 190°F (66 to 88°C) at midday during the summer.

    Cool roofs

  • Cool roofs with both high reflectance and high emittance warm to only 100 to 120°F (38 to 49°C) in the summer sun.

    Cool roofs

  • Thermal emittance is defined as the percentage of energy a material can radiate away after it is absorbed.

    Cool roofs

  • Cool roof materials have two important surface properties: a high solar reflectance – or albedo – and a high thermal emittance.

    Cool roofs

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