INVESTIGATION OF CONDENSATION-INDUCED DUST REMOVAL ON MODIFIED SURFACE FOR PV MODULE

Liao Zhixing; Liu Quanbing; Huang Simin; Yuan Wuzhi

doi:10.19912/j.0254-0096.tynxb.2021-0615

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (11) : 33-40. DOI: 10.19912/j.0254-0096.tynxb.2021-0615

INVESTIGATION OF CONDENSATION-INDUCED DUST REMOVAL ON MODIFIED SURFACE FOR PV MODULE

Liao Zhixing^1,2, Liu Quanbing¹, Huang Simin², Yuan Wuzhi²

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Abstract

Five surfaces with different wettabilities are prepared. Then, the self-cleaning of PV module surface is investigated under condensing conditions. The condensation-induced dust removal process, mechanism and dust removal performance of different surfaces were analyzed. The results show that the super-hydrophilic surface, hydrophilic surface and hydrophobic surface cannot achieve dust removal, while the condensate droplets on the superhydrophobic surface （SHS） and hydrophobic slippery surface （HPO-SLIP） can removemore than 76% dust of the surface in a rolling manner. Compared with the hydrophilic surface, the hydrophobic surface can effectively reduce the relative coverage of dust on the surface after condensation and drying, thus reducing the impact of the shielding effect of dust on photovoltaic system. On the SHS, rolling droplets are smaller and faster, and dust removal occurs earlier. In contrast, rolling droplets on the HPO-SLIP are larger and slower, but the contact area with the surface is large, resulting in a wider cleaning range. The condensation-induced dust removal mainly relies on the interface force between dust particles and condensate. The smaller the critical diameter of droplet detachment, the more conducive dust can be removed.

Key words

photovoltaic modules / surface self-cleaning / condensation / surface wettability / dust

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Liao Zhixing, Liu Quanbing, Huang Simin, Yuan Wuzhi. INVESTIGATION OF CONDENSATION-INDUCED DUST REMOVAL ON MODIFIED SURFACE FOR PV MODULE[J]. Acta Energiae Solaris Sinica. 2022, 43(11): 33-40 https://doi.org/10.19912/j.0254-0096.tynxb.2021-0615

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