absorptance


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Related to absorptance: transmittance

absorptance

[əb′sȯrp·təns]
(physics)
The ratio of the total unabsorbed radiation to the total incident radiation; equal to one (unity) minus the transmittance.

absorptance

In illumination engineering, the ratio of the absorbed flux to the incident flux.
References in periodicals archive ?
As in this paper the focus is on investigating the effects of the AIT texture on the absorptance of the a-Si:H thin-film solar cell precursors, no wet-chemical postdeposition AZO texturing step was applied in these experiments.
For cooling demand, Case 1, which only uses the area ratio to calculate diffuse solar radiation (without consideration of reflectance or absorptance), has the highest error rate (up to 11%) because the ceiling's absorptance is only 20%, and using the area ratio to weight causes the model to overestimate the amount of diffuse solar radiation distributed on the ceiling, especially in situations with large floor/ceiling areas.
(1994), using instrumentation similar to that used in the present work, observed peak absorptance values in the 400 to 700 nm range of greater than 0.90 for fully expanded 11th leaves of field grown maize.
[Q.sub.hbl] = heat from solar radiation transmitted through the window and absorbed by the sphere (absorptance of the sphere is assumed to be 0.7)
where, [f.sub.w_i] is view factor from window to surface i, [F.sub.other_i] is view factor from other surface to surface i, a is the absorptance, [A.sub.lighting_i] is the lighting area on surface i, [summation over ([A.sub.lighting_i])] is the total lighting area on internal surfaces.
The benefits of the advanced shading system are more prominent when a material with higher absorptance is selected.
The baseline paint solar-weighted absorptance was 64.1% with 60.9% absorptance in the near-infrared spectrum.
At the time of installing a new roof or resurfacing a pavement, typically choices are available to select surfaces with lower solar absorptance (higher reflectance) at no incremental cost.
This proposed selective absorber has approximately unity absorptance below the cutoff wavelength to maximize the absorbed solar energy, and a much lower emittance beyond the cutoff wavelength to minimize the thermal reemission.
The action spectrum, absorptance and quantum yield of photosynthesis in crop plants.
[K.sup.-4]) [theta]: Angle of incidence ([omicron]) [tau]: Transmittance of glass cover [alpha]: Absorptance of the receiver [gamma]: Intercept factor [rho]: Reflectance of the mirror.