Reflectometer comparison for assessment of back-silvered glass solar mirrors
dc.contributor.author | Sansom, Christopher L. | |
dc.contributor.author | Fernández-García, Aránzazu | |
dc.contributor.author | King, Peter | |
dc.contributor.author | Sutter, Florian | |
dc.contributor.author | Garcia Segura, Alejandro | |
dc.date.accessioned | 2017-07-10T15:20:13Z | |
dc.date.available | 2017-07-10T15:20:13Z | |
dc.date.issued | 2017-06-29 | |
dc.description.abstract | This paper compares the two most common reflectometers used to assess the specular reflectance of back-silvered glass mirrors for Concentrating Solar Power (CSP) applications, namely the Device and Services (D&S) 15R-USB and the Abengoa Condor SR-6.1 instruments. Comparisons are first made between the two instruments themselves using a Gage Repeatability and Reproducibility (R&R) study. Results are given for the as-cleaned collector mirrors and then as the mirrors become naturally soiled over a one month period. The results of the Gage R&R study show that for the D&S the gage itself contributes 40.97% of the variability, whilst 59.03% is due to part-to-part (location on the mirror under investigation) variability. For the Condor we show that the % Contribution from the gage is 62.18% of the total variability with only 37.82% of the contribution attributable to the location dependent reflectance. The Condor has a wider acceptance angle, and over the reflectance range of 0.91–0.95 the condor was found to measure higher than the D&S by an average of 1.53%. The differences between the soiling results obtained from the two instruments are explained, and the results are used to derive a predictive model for the soiling of solar collectors. In conclusion, both instruments have advantages and shortcomings, and the factors that influence which instrument to select are discussed. | en_UK |
dc.identifier.citation | Christopher Sansom, Aránzazu Fernández-García, Peter King, Florian Sutter, Alejandro Garcia Segura, Reflectometer comparison for assessment of back-silvered glass solar mirrors, Solar Energy, Volume 155, October 2017, Pages 496-505 | en_UK |
dc.identifier.issn | 0038-092X | |
dc.identifier.uri | http://dx.doi.org/10.1016/j.solener.2017.06.053 | |
dc.identifier.uri | https://dspace.lib.cranfield.ac.uk/handle/1826/12177 | |
dc.language.iso | en | en_UK |
dc.publisher | Elsevier | en_UK |
dc.rights | Attribution-NonCommercial-NoDerivatives 4.0 International | |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | |
dc.subject | Reflectometry | en_UK |
dc.subject | Optical instruments | en_UK |
dc.subject | Solar collector | en_UK |
dc.subject | Collector | en_UK |
dc.subject | Soiling | en_UK |
dc.title | Reflectometer comparison for assessment of back-silvered glass solar mirrors | en_UK |
dc.type | Article | en_UK |
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