Glossary
- Absorptivity or absorptance (α):
-
The fraction of the incoming radiation which is absorbed at a specified wavelength (absorptivity) or summed over a specified spectrum range (absorptance). Absorptivity and absorptance are dimensionless quantities.
- Collector aperture/absorber/gross area:
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Net area (of a flat surface) through which the collector receives solar radiation. Any of these areas can be used for referencing the incoming radiation. For nonflat geometries: a projected flat area is used for the aperture and gross areas, but for absorber areas the full curved surface area is taken into account.
- Collector mean temperature (Tm):
-
Defined, in operating terms, as the averaged value of the inlet and outlet temperatures of the collector heat transfer medium (usually that of water, water/glycol, or air):
\( {T}_m=\frac{T_{\mathrm{outlet}}+{T}_{\mathrm{inlet}}}{2}. \)
- Emissivity (ε or e):
-
The ability of a surface to emit energy by radiation relative to that of a “black body.” For a...
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Fortuin, S., Stryi-Hipp, G., Kramer, W., Kramer, K. (2022). Solar Collectors, Non-concentrating. In: Alexopoulos, S., Kalogirou, S.A. (eds) Solar Thermal Energy. Encyclopedia of Sustainability Science and Technology Series. Springer, New York, NY. https://doi.org/10.1007/978-1-0716-1422-8_681
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