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Advanced Analysis of Corroded Solar Reflectors

Buendía-Martinez, Francisco and Fernandez-Garcia, Arantxa and Sutter, Florian and Valenzuela, L. and Garcia-Segura, A. (2019) Advanced Analysis of Corroded Solar Reflectors. Coatings, 9 (749). Multidisciplinary Digital Publishing Institute (MDPI). DOI: 10.3390/coatings9110749 ISSN 2079-6412

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Official URL: http://dx.doi.org/10.3390/coatings9110749

Abstract

The corrosion of the reflective layer is one of the main degradation mechanisms of solar reflectors. However, the appropriate assessment of the corroded reflector samples is not accomplished by the current analysis techniques. On the one hand, the reflectance measurement protocol of non-damaged solar reflectors for concentrating solar thermal technologies is widely addressed in the SolarPACES reflectance guideline. However, this methodology is not adequate for reflectors whose surface is partially corroded by many kind of corrosion agents. In this work, a new measurement technique to properly assess corroded samples was developed. To check the usefulness of the method, several damaged samples (subjected to two accelerated aging tests) were evaluated with the conventional technique and with the improved one. The results showed that a significant discrepancy is observed between the two methods for heavily corroded samples, with average reflectance differences of 0.053 ppt. The visualization of the reflector images illustrated that the improved method is more reliable. On the other hand, both the corrosion products formed and the corrosion rates were identified after each corrosive test. The chemical atmosphere significantly affects the products formed, whereas the corrosion rates are influenced by the test conditions and the reflector Quality.

Item URL in elib:https://elib.dlr.de/130853/
Document Type:Article
Title:Advanced Analysis of Corroded Solar Reflectors
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Buendía-Martinez, FranciscoCIEMAT PSAUNSPECIFIED
Fernandez-Garcia, ArantxaCIEMAT-PSAUNSPECIFIED
Sutter, FlorianFlorian.Sutter (at) dlr.dehttps://orcid.org/0000-0002-2981-5807
Valenzuela, L.CIEMAT, AlmeriaUNSPECIFIED
Garcia-Segura, A.ciemat psaUNSPECIFIED
Date:11 November 2019
Journal or Publication Title:Coatings
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:9
DOI :10.3390/coatings9110749
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
ISSN:2079-6412
Status:Published
Keywords:concentrating solar thermal energy; corroded solar reflector; improved measurement method; corrosion product; corrosion rate; monochromatic specular reflectance; solar hemispherical reflectance
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 2019 15:19
Last Modified:10 Feb 2020 11:08

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