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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

emittance

The ratio of radiant flux emitted by a material to that emitted by a blackbody at the same temperature, under the same conditions.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
Fortunately however, the short-wavelength radiation is always weak when we normalize the emittance spectra to the blackbody radiation at a certain temperature (e.g., 2000K, as seen in Fig.
The three-year-old reflectance and emittance values represent a long-term expectation of performance.
Cool roof granules are a treated kaolin product used in industrial roofing systems that delivers superior solar reflectance and higher thermal emittance than standard designed roofing products.
The images of eye, nose, foot and left side of the animal were obtained using an infrared thermograph ThermaCAM (FLIR Systems Inc., Wilsonville, OR, USA) using an emittance coefficient of 0.95 with a distance of one meter to measure the temperature of surface of the animal.
Quiet and slowly varying emissions are both thermal radiation: the brightness temperature, which is proportional to the emittance in the Rayleigh-Jeans approximation of the Planck law, corresponds to an average temperature weighted over a given wavelength range.
where [[epsilon].sub.np] is normalized transverse emittance of proton beam.
For example, roads covered with different cement and asphalt materials are represented differently in greyscale in the PAN and TIR images because the TIR image is related to surface emittance, namely, surface temperature (Figure 4).
Best, "An FT-IR based instrument for measuring spectral emittance of material at high temperature," Review of Scientific Instruments, vol.
Typically, solar heat reflective coatings are characterized by a high solar reflectance and high emittance values in the thermal infrared region.
While the money was already credited to the beneficiaries, Deguito said she still instructed the bank's senior customer relations officer (SCRO), Angela Torres, to email the settlements department and ask for an advance copy of the MT 103, which she said contained details of the funds such as the amount, the sender, the beneficiary, and the purpose of the emittance.
Builders can also differentially focus on cooling or heating demands by choosing roof or wall materials that are more reflective or that shed heat quickly (within the IECC, these concepts are capture more formally via the terms absorptance, emittance, and remittance).