Spectral emittance of ceramics for high temperature solar receivers

Year: 2021

Authors: Azzali N., Meucci M., Di Rosa D., Mercatelli L., Silvestroni L., Sciti D., Sani E.,

Autors Affiliation: aCNR-INO National Institute of Optics, Largo E. Fermi, 6, I-50125 Firenze, Italy bDepartment of Energy, Systems, Territory and Constructions (D.E.S.Te.C), University of Pisa, Largo Lucio Lazzarino 1, I-56122 Pisa, Italy cCNR-ISTEC Institute of Science and Technology for Ceramics, Via Granarolo 64, I-48018 Faenza, Italy

Abstract: In this work, for the first time, we studied the temperature-dependent spectral emittance of highly refractory ceramics, e.g. silicon carbide (SiC) and two ultra-high temperature ceramics (tantalum diboride (TaB2), zirconium
diboride (ZrB2)) to evaluate their potential for solar tower receivers applications. We measured the spectral normal emittance from 1 μm to 21 μm at temperatures up to 850 ◦C, in vacuum, by means of a novel experimental
setup composed by an electric furnace connected to a FT-IR spectrometer. Comparison with previously published data collected with a different setup was also carried out to validate the results. In addition, the experimental spectral emittance was also compared with the values calculated from hemispherical reflectance at room temperature by means of Kirchhoff’s law. The results show that surface features play a fundamental role in the emittance of investigated ceramics.

Journal/Review: SOLAR ENERGY

Volume: 222      Pages from: 74  to: 83

KeyWords: Spectral emittance; Solar absorber; Silicon carbide; Borides; Concentrating solar power; Optical properties
DOI: 10.1016/j.solener.2021.05.019

Citations: 6
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