Modelling photovoltaic soiling losses through optical characterization

Smestad, Greg P.; Germer, Thomas A.; Alrashidi, Hameed; Fernández, Eduardo F.; Dey, Sumon; Brahma, Honey; Sarmah, Nabin; Ghosh, Aritra; Sellami, Nazmi; Hassan, Ibrahim A. I.; Desouky, Mai; Kasry, Amal; Pesala, Bala; Sundaram, Senthilarasu; Almonacid, Florencia; Reddy, K. S.; Mallick, Tapas K.; Micheli, Leonardo

doi:10.1038/s41598-019-56868-z

Modelling photovoltaic soiling losses through optical characterization

Journal Article · Thu Jan 09 00:00:00 EST 2020 · Scientific Reports

DOI:https://doi.org/10.1038/s41598-019-56868-z· OSTI ID:1593694

Smestad, Greg P. ^[1]; Germer, Thomas A. ^[2]; Alrashidi, Hameed ^[3]; Fernández, Eduardo F. ^[4]; Dey, Sumon ^[5]; Brahma, Honey ^[6]; Sarmah, Nabin ^[6]; Ghosh, Aritra ^[3]; Sellami, Nazmi ^[7]; Hassan, Ibrahim A. I. ^[8]; Desouky, Mai ^[9]; Kasry, Amal ^[9]; Pesala, Bala ^[10]; Sundaram, Senthilarasu ^[3]; Almonacid, Florencia ^[4]; Reddy, K. S. ^[11]; Mallick, Tapas K. ^[3]; Micheli, Leonardo ^[12]

Sol Ideas Technology Development, San Jose, CA (United States)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
Univ. of Exeter, Penryn (United Kingdom)
Univ. de Jaén (Spain)
Academy of Scientific and Innovative Research, Chennai (India)
Tezpur Univ. (India)
Heriot-Watt Univ., Dubai (United Arab Emirates); Robert Gordon Univ., Aberdeen (United Kingdom)
South Valley Univ., Qena (Egypt); Univ. of York, Toronto, ON (Canada)
The British Univ. in Egypt, Cairo (Egypt)
CSIR-Central Electronics Engineering Research Inst. & Academy of Scientific and Innovative Research, Chennai (India)
Indian Inst. of Technology Madras, Chennai (India)
Univ. de Jaén (Spain); National Renewable Energy Lab. (NREL), Golden, CO (United States)

The accumulation of soiling on photovoltaic (PV) modules affects PV systems worldwide. Soiling consists of mineral dust, soot particles, aerosols, pollen, fungi and/or other contaminants that deposit on the surface of PV modules. Soiling absorbs, scatters, and reflects a fraction of the incoming sunlight, reducing the intensity that reaches the active part of the solar cell. Here, we report on the comparison of naturally accumulated soiling on coupons of PV glass soiled at seven locations worldwide. The spectral hemispherical transmittance was measured. It was found that natural soiling disproportionately impacts the blue and ultraviolet (UV) portions of the spectrum compared to the visible and infrared (IR). Also, the general shape of the transmittance spectra was similar at all the studied sites and could adequately be described by a modified form of the Angstrom turbidity equation. In addition, the distribution of particles sizes was found to follow the IEST-STD-CC 1246E cleanliness standard. The fractional coverage of the glass surface by particles could be determined directly or indirectly and, as expected, has a linear correlation with the transmittance. It thus becomes feasible to estimate the optical consequences of the soiling of PV modules from the particle size distribution and the cleanliness value.

View Accepted Manuscript (DOE)

Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S)

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1593694

Report Number(s):: NREL/JA--5K00-74546

Journal Information:: Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 10; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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