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Evaluation of anti-soiling coatings for CSP reflectors under realistic outdoor onditions

Wette, Johannes and Sutter, Florian and Fernandez-Garcia, Arantxa (2019) Evaluation of anti-soiling coatings for CSP reflectors under realistic outdoor onditions. Solar Energy (191), pp. 574-584. Elsevier. DOI: 10.1016/j.solener.2019.09.031 ISSN 0038-092X

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Official URL: https://doi.org/10.1016/j.solener.2019.09.031

Abstract

Soiling of solar reflectors affects their reflectance and has a direct impact on the power output of concentrated solar power (CSP) plants. One way to minimize the efficiency losses is the implementation of anti-soiling coatings on the reflector surfaces. This method is being studied for the past decade, but has not been successfully commercialized yet. The purpose of the coatings is to reduce soiling and improve the washability of the reflectors. In this work results are presented from an extensive outdoor campaign of two potential anti-soiling coatings under realistic conditions at a representative CSP site in southern Spain. Nearly six years of outdoor data are available, which makes this campaign the longest published on this type of coatings. Regular cleaning and reflectance measurements were performed during the exposure and conclusions about the performance and durability of the coatings are drawn. It is shown that in the initial state the coatings show an advantageous behavior, resulting in higher reflectance during outdoor exposure due to less soiling and better cleaning of the reflectors. The second main finding is that durability is an important issue for the implemented coatings, as their properties degrade over time resulting in lower reflectance values after several years of exposure compared to conventional glass reflectors.

Item URL in elib:https://elib.dlr.de/130798/
Document Type:Article
Title:Evaluation of anti-soiling coatings for CSP reflectors under realistic outdoor onditions
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Wette, JohannesJohannes.Wette (at) dlr.dehttps://orcid.org/0000-0003-1389-5176
Sutter, FlorianFlorian.Sutter (at) dlr.dehttps://orcid.org/0000-0002-2981-5807
Fernandez-Garcia, ArantxaCIEMAT-PSAUNSPECIFIED
Date:2019
Journal or Publication Title:Solar Energy
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1016/j.solener.2019.09.031
Page Range:pp. 574-584
Publisher:Elsevier
ISSN:0038-092X
Status:Published
Keywords:Anti-soiling Solar reflector Reflectance Durability Concentrated solar power
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 11:14

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