- n. The quantity emitted (per unit area).
“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.”
“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”
“It does indeed have three major absorption peaks that fall within the blackbody emittance spectrum of the Earth.”
“Wherever mean value of emittance spectrum is, these wavebands cover only tiny part of cummulative emitted energy.”
“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.”
“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.”
“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 with both high reflectance and high emittance warm to only 100 to 120°F (38 to 49°C) in the summer sun.”
“Thermal emittance is defined as the percentage of energy a material can radiate away after it is absorbed.”
“Cool roof materials have two important surface properties: a high solar reflectance – or albedo – and a high thermal emittance.”
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