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Comparative modeling of optical soiling losses for CSP and PV energy systems

Bellmann, Philipp and Wolfertstetter, Fabian and Concelcao, Ricardo and Silva, Hugo G. (2020) Comparative modeling of optical soiling losses for CSP and PV energy systems. Solar Energy, 197, pp. 229-237. Elsevier. DOI: 10.1016/(j.solener.2019.12.045 ISSN 0038-092X

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Official URL: https://doi.org/10.1016/j.solener.2019.12.045


Soiling is a challenge for both concentrating solar and photovoltaic technologies. Measurement procedures and efficiency sensitivities to soiling for the same surface particle density differ due to the different optical characteristics of both technologies. For this reason, soiling investigations performed at a site for one technology are not necessarily applicable to the other technology. Soiling measurements have been performed mostly under fixed or rarely occurring angles of incidence. In this study parallel measurements of soiling loss and particle mass density found on the main optical surfaces of concentrating solar power (CSP) and photovoltaic (PV) technologies are presented. The measurements are taken on samples of CSP second surface mirror and PV solar glass with consideration of the main optical characteristics of both technologies. Optical soiling losses are found to be higher by a factor of 8–14 in CSP for the same particle surface densities compared to PV. A Mie-based model is presented and validated, that converts the particle mass density and a set of other inputs into the optical soiling loss for either technology for normal angle of incidence and varying angles of incidence. This method facilitates the transfer of soiling loss data from one technology to another. The method can significantly increase the knowledge on soiling for both technologies as more measurement data is made accessible. Additionally, the soiling losses for different angles of incidence can be used to estimate more realistic annual loss parameters for the technologies in question and give recommendations for optimized incidence angles to be used in soiling measurements for both technologies.

Item URL in elib:https://elib.dlr.de/133520/
Document Type:Article
Title:Comparative modeling of optical soiling losses for CSP and PV energy systems
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bellmann, PhilippDresden University of TechnologyUNSPECIFIED
Wolfertstetter, Fabianfabian.wolfertstetter (at) dlr.dehttps://orcid.org/0000-0003-4323-8433
Concelcao, RicardoUniversity of EvoraUNSPECIFIED
Silva, Hugo G.University of EvoraUNSPECIFIED
Date:February 2020
Journal or Publication Title:Solar Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/(j.solener.2019.12.045
Page Range:pp. 229-237
Keywords:Solar energy; Soiling losses; PV and CSP; Mie scattering; Soiling model; Yield analysis
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:23 Jan 2020 10:58
Last Modified:23 Jan 2020 10:58

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