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, Natl Inst Opt, Largo E Fermi 6, I-50125 Florence, Italy; Univ Pisa, Dept Energy Syst Terr & Construct DESTeC, Largo Lucio Lazzarino 1, I-56122 Pisa, Italy; CNR, ISTEC, Inst Sci & Technol Ceram, 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 Kirchhoffs 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 DŽUva and Mr. Mauro Pucci for technical assistance.KeyWords: Spectral emittance; Solar absorber; Silicon carbide; Borides; Concentrating solar power; Optical propertiesDOI: 10.1016/j.solener.2021.05.019Citations: 20data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2024-11-03References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here