Journal
SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume 140, Issue -, Pages 249-252Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solmat.2015.04.009
Keywords
Thermal solar energy; Solar selective coatings; Efficiency; Infrared radiation; Spectral emissivity
Funding
- Basque Government [S-PC08UN07, S-PE13UN123]
- CIC-Energigune
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The total emissivity of the absorbing surfaces is a critical parameter in the calculation of the radiative thermal losses in solar thermal collectors. This is because the radiative heat losses have a significant economic impact on the final cost of the electricity produced in a solar thermal plant. This paper demonstrates the need to calculate the total emissivity from spectral emissivity measurements at the working temperature of the solar thermal collector, instead of using extrapolated values from spectral emissivities measured at room temperature. Usual uncertainties produced by the estimation of the total emissivity, in which its temperature dependence is only introduced by the Planck function, are analyzed. (C) 2015 Elsevier B.V. All rights reserved.
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