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Water Saving in CSP Plants by a Novel Hydrophilic Anti-Soiling Coating for Solar Reflectors

Wette, Johannes and Fernandez-Garcia, Arantxa and Sutter, Florian and Buendía-Martinez, Francisco and Argüelles-Arizcun, David and Azpitarte, Itziar and Perez, Gema (2019) Water Saving in CSP Plants by a Novel Hydrophilic Anti-Soiling Coating for Solar Reflectors. Coatings, 9 (739). Multidisciplinary Digital Publishing Institute (MDPI). DOI: 10.3390/coatings9110739 ISSN 2079-6412

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Official URL: http://dx.doi.org/10.3390/coatings9110739

Abstract

In this work, results of the outdoor exposure campaign of a newly developed hydrophilic anti-soiling coating for concentrated solar thermal power (CSP) mirrors are presented. The material was exposed for nearly two years under realistic outdoor conditions and the influence of two different cleaning techniques was evaluated. Mirror samples were analyzed during exposure and their reflectance and cleanliness were measured. The performance of the anti-soiling coated mirror samples was compared to conventional uncoated silvered-glass mirrors. The coatings showed appropriate anti-soiling and easy-to-clean behavior, with a mean cleanliness gain of 1 pp and maximum values under strong soiling conditions of up to over 7 pp. Cleanliness of the coated samples stayed higher throughout the whole campaign before and after cleaning, resulting in lower soiling rate compared to the reference material. Taking into account these values and supposing a threshold for cleaning of 96%, the number of cleaning cycles could be decreased by up to 11%. Finally, the coated material showed negligible degradation, not exceeding the degradation detected for the reference material.

Item URL in elib:https://elib.dlr.de/130847/
Document Type:Article
Title:Water Saving in CSP Plants by a Novel Hydrophilic Anti-Soiling Coating for Solar Reflectors
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Wette, JohannesJohannes.Wette (at) dlr.dehttps://orcid.org/0000-0003-1389-5176
Fernandez-Garcia, ArantxaCIEMAT-PSAUNSPECIFIED
Sutter, FlorianFlorian.Sutter (at) dlr.dehttps://orcid.org/0000-0002-2981-5807
Buendía-Martinez, FranciscoCIEMAT PSAUNSPECIFIED
Argüelles-Arizcun, DavidCIEMAT PSAUNSPECIFIED
Azpitarte, ItziarIK4-TeknikerUNSPECIFIED
Perez, GemaRioglas SolarUNSPECIFIED
Date:7 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/coatings9110739
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
ISSN:2079-6412
Status:Published
Keywords:concentrated solar thermal power; water saving; solar reflector; anti-soiling coating; outdoor test; reflectance measurement; soiling rate; cleaning method
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 11:07

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