Round Robin Test for the comparison of spectral emittance measurement apparatuses

Year: 2019

Authors: Le Baron E., Raccurt O., Giraud P., Adier M., Barriga J., Diaz B., Echegut P., De Sousa Meneses D., Capiani C., Sciti D., Soum-Glaude A., Escape C., Jerman I., López G.A., Echániz T., Tello M.J., Matino F., Maccari A., Mercatelli L., Sani E.

Autors Affiliation: Univ. Grenoble Alpes, CEA, LITEN, DTBH, F-38000 Grenoble, INES, F-73375 Le Bourget du Lac, France; IK4-TEKNIKER, Physics of Surfaces and Materials, 20600 Eibar, Gipuzkoa, Spain; CNRS, CEMHTI UPR3079, Univ. Orléans, F-45071 Orléans, France; CNR ISTEC, Inst Sci & Technol Ceram, Via Granarolo 64, I-48018 Faenza, Italy; PROMES-CNRS, 7 rue du Four Solaire, F-66120 Font-Romeu Odeillo, France; National Institute of Chemistry, Hajdrihova 19, 1000 Ljubljana, Slovenia; Applied Physics II, University of the Basque Country UPV/EHU, Barrio Sarriena s/n, 48940 Leioa, Spain;
Archimede Solar Energy, Voc. Flaminia Vetus 88, 06056 Massa Martana, Italy; CNR INO National Institute of Optics, Largo E. Fermi 6, 50125 Firenze, Italy

Abstract: CSP (Concentrated Solar Power) plants technologies use the concentration of solar energy on a receiver to produce heat and then electricity by a thermodynamical process. A solar absorber material is used to convert the energy carried by light into heat. This type of material works at high temperatures (up to 1000 °C) under a highly concentrated solar flux (up to x1000 or more). Optical properties determine the performance of absorbers and it is thus necessary to measure their spectral absorptance and emittance. Solar absorptance is directly linked to the capacity of the absorber material to convert the solar flux into heat. Emittance drives the radiative thermal losses for the heated absorber and depends on the absorber temperature. The characterization of a material in operational conditions at high temperatures requires advanced apparatuses, and different measurement methods exist for the characterization of these two quantities of relevance regarding an absorber. A Round Robin Test (RRT) was conducted with the objective of comparing different new optical apparatuses and methods for measuring the emittance or luminance of various solar absorbers in air. Measurements were carried out directly at temperatures up to 560 °C while heating the samples, and also indirectly by hemispherical reflectance measurements at room temperature. In this paper, the Round Robin Test procedure to compare apparatuses is described, as well as the corresponding reflectance and emittance results on four types of materials. In addition, a discussion of some factors of influence over high temperature measurements in air and of the observed discrepancies among results from the evaluators is presented. The reliability of reflectance/emittance measurements is also demonstrated and statistics of deviations from the mean value are analysed. These allow us to infer information about measurement reproducibility. The reflectance spectra of all samples after high temperature measurements in air (up to 500 °C) do not show any significant changes.


Volume: 191      Pages from: 476  to: 485

More Information: The research leading to these results has received funding from the European Energy Research Alliance (EERA) with the European project N° 609837 “Scientific and Technological Alliance for Guaranteeing the European Excellence in Concentrating Solar Thermal Energy – STAGE STE”. This work was supported by the French \”Investments for the future\” program managed by the French National Research Agency under contracts ANR-10-LABX-22-01-SOLSTICE , ANR-10- EQPX-49-SOCRATE and ANR-11-EQPX-0014-DURASOL for some of the equipment. This work has also received funding from the Auvergne region. Appendix A
KeyWords: Concentration (process); Optical properties; Reflection; Solar energy; Spectrophotometry; Superconducting tapes; Temperature measurement, Concentrated solar power; Hemispherical reflectance; High temperature; High temperature measurement; Measurement reproducibility; Round Robin test; Round Robin test procedures; Thermal emittance, Solar absorbers
DOI: 10.1016/j.solmat.2018.11.026

Citations: 10
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