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Investigation of soiling effect on different solar mirror materials under Moroccan climate

Alami Merrouni, Ahmed and Wolfertstetter, Fabian and Mezrhab, Ahmed and Wilbert, Stefan and Pitz-Paal, Robert (2015) Investigation of soiling effect on different solar mirror materials under Moroccan climate. Energy Procedia (69), pp. 1948-1957. Elsevier. DOI: 10.1016/j.egypro.2015.03.194 ISSN 1876-6102

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Abstract

This paper presents some first results of the effect of dust on different solar mirror materials in Morocco. For this purpose, thirteen glass and aluminum mirrors were exposed at the University of Oujda (Eastern Morocco) for a period of three months (from April to June). For each type of the mirrors, one sample mirror was installed horizontally and twelve mirrors were installed in the so called “mirrors sphere” in four different directions (North, South, East and West) with three tilt angles relative to the vertical plane: +45°(facing the sky), 0° (vertical) and -45° (facing the ground). The drops in specular reflectance were measured after each month of exposition for both mirror materials. Furthermore, X-ray diffraction analyses were performed for the dust collected from the mirrors to identify the mineralogical components of the dirt settled on the mirror surfaces. For both mirror materials, the drop on cleanliness per time interval was quite the same for all the mirrors and over all the test periods. The highest average cleanliness drop per month for the horizontal mirrors was 45 % and 33 % for the glass and aluminum mirrors respectively. The +45° mirrors come in the second position with a cleanliness drop of about 14 % for both reflectors. However, the mirrors installed on the 0° and -45° angles remained cleaner with a cleanliness average of about 97 % for both mirrors. These first results can be of high importance to motivate scientists and actors in the field of solar energy to further investigate the soiling of CSP mirrors and add it as a parameter in solar resource assessment.

Item URL in elib:https://elib.dlr.de/96911/
Document Type:Article
Title:Investigation of soiling effect on different solar mirror materials under Moroccan climate
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Alami Merrouni, AhmedUniversite Mohammed Premier OujdaUNSPECIFIED
Wolfertstetter, Fabianfabian.wolfertstetter (at) dlr.deUNSPECIFIED
Mezrhab, AhmedUniversite Mohammed Premier OujdaUNSPECIFIED
Wilbert, Stefanstefan.wilbert (at) dlr.deUNSPECIFIED
Pitz-Paal, Robertrobert.pitz-paal (at) dlr.deUNSPECIFIED
Date:May 2015
Journal or Publication Title:Energy Procedia
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
DOI :10.1016/j.egypro.2015.03.194
Page Range:pp. 1948-1957
Publisher:Elsevier
ISSN:1876-6102
Status:Published
Keywords:Dust effect; Soiling; Mirrors; CSP;Outdoor exposition; Eastern Morocco
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Concentrating Solar Systems (old)
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Qualification (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Qualifizierung
Deposited By: Kruschinski, Anja
Deposited On:30 Jun 2015 13:07
Last Modified:06 Sep 2019 15:22

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