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Title: Integrated effects of PM2.5 deposition, module surface conditions and nanocoatings on solar PV surface glass transmittance
Authors: Sun, K 
Lu, L 
Jiang, Y 
Wang, Y
Zhou, K
He, Z
Keywords: Aerosol dynamics
Deposition density
Mathematic modeling
TiO2 nanocoating
Transmittance reduction
Issue Date: 2018
Publisher: Elsevier Ltd
Source: Renewable and sustainable energy reviews, 2018, v. 82, p. 4107-4120 How to cite?
Journal: Renewable and sustainable energy reviews 
Abstract: Aerosol deposition is highly concerned recently due to its significant impact on surface glass cleaning, glass transmittance and energy conversion of building-integrated photovoltaics (BIPV). Thus, this paper reviewed direct transmittance degradation works of PV module surface glasses, and employed several integrated and improved experiment and model methods to investigate the correlation effects of PM2.5 deposition dynamics, tilt angles, surface conditions and self-cleaning TiO2 nanocoating on glasses. Series of physical models from ambient aerosol concentration to deposition density and transmittance reduction were extended or newly developed. Measured and modeled data could inter-validate with each other and literature results. The usage condition of Al-Hasan model was discovered as 0<ap<0.10 for particle projected-area fraction under clustering particle projected-area fraction apcp≤5%. Ranging from 0 to 18.7 μg/cm2, deposition densities with the most reductions (50–91%) were found under the combination of wet and nanocoating conditions due to effects of water film and low adhesive force. Generally, the average deposition densities decreased 19–47% with the increase of each 30° tilt angle for different surface properties. Finally, six linear empirical models were obtained with decreasing slopes of 0.001544–0.001841 between fine aerosol deposition density and transmittance ratio. These observed phenomena and derived models would be useful for solar energy, building illumination or heat-transfer, and BIPV industries.
ISSN: 1364-0321
EISSN: 1879-0690
DOI: 10.1016/j.rser.2017.10.062
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