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: CNR-INO National Institute of Optics, Largo E. Fermi, 6, I-50125 Firenze, Italy: Department of Energy, Systems, Territory and Constructions (D.E.S.Te.C), University of Pisa, Largo Lucio Lazzarino 1, I-56122 Pisa, Italy; CNR-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

More Information: Authors thank Dr. Jean-Luis Sans (PROMES-CNRS) for emittance data taken with the MEDIASE setup. A part of the present research has been carried out with funding by the Italian bank foundation “Fondazione Cassa di Risparmio di Firenze” in the framework of the I-SOLAR project (Pratica 2020.1728). Thanks are also due to Mr. Massimo D´Uva and Mr. Mauro Pucci for technical assistance.
KeyWords: Spectral emittance; Solar absorber; Silicon carbide; Borides; Concentrating solar power; Optical properties
DOI: 10.1016/j.solener.2021.05.019

Citations: 16
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