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Reflectometer comparison for assessment of back-solvered glass solar mirrors

Sansom, Christopher and Fernandez-Garcia, Aranzazu and King, Peter and Sutter, Florian and Garcia Segura, Alejandro (2017) Reflectometer comparison for assessment of back-solvered glass solar mirrors. Solar Energy (155), pp. 496-505. Elsevier. DOI: 10.1016/j.solener.2017.06.053 ISSN 0038-092X

Full text not available from this repository.

Official URL: http://www.elsevier.com/locate/solener

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. � 2017

Item URL in elib:https://elib.dlr.de/115424/
Document Type:Article
Title:Reflectometer comparison for assessment of back-solvered glass solar mirrors
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Sansom, Christophercranfield universityUNSPECIFIED
Fernandez-Garcia, Aranzazuarantxa.fernandez (at) psa.esUNSPECIFIED
King, PeterCranfield UniversityUNSPECIFIED
Sutter, FlorianFlorian.Sutter (at) dlr.deUNSPECIFIED
Garcia Segura, AlejandroCiemat-Plataforma SolarUNSPECIFIED
Date:2017
Journal or Publication Title:Solar Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1016/j.solener.2017.06.053
Page Range:pp. 496-505
Publisher:Elsevier
ISSN:0038-092X
Status:Published
Keywords:Reflectometry, Optical instruments, Solar collector, collector, Soiling
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Concentrating Solar Thermal Technology
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Impact of Desert Environment
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Qualification
Deposited By: Kruschinski, Anja
Deposited On:20 Nov 2017 14:04
Last Modified:09 Jan 2018 09:10

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