Analyzing wind cleaning process on the accumulated dust on solar photovoltaic (PV) modules on flat surfaces. (1st January 2018)

• Record Type: Journal Article
• Authors: Jiang, Yu; Lu, Lin; Ferro, Andrea R.; Ahmadi, Goodarz
• Is Part Of: Solar energy. Volume 159(2018)
• Page Start: 1031
• Page End: 1036
• Publication Date: 2018-01-01
• Subjects: Wind cleaning -- PV modules -- Accumulated dust -- Particle resuspension -- Flat surface; Solar energy -- Periodicals; Solar engines -- Periodicals; 621.47
• DOI: 10.1016/j.solener.2017.08.083
• Languages: English
• ISSNs: 0038-092X

Abstract

Highlights: Shear velocity was increased with the increase of particle diameter. Actual wind velocity varied from 0.82 m/s to 2219.8 m/s. Shear velocity was increased with the decrease of roughness parameter. Abstract: In this study, the particle resuspension theory was used to estimate the wind cleaning process of the dust particles deposited on flat solar photovoltaic (PV) module surfaces. The model includes the effects of adhesion force, as well as, the hydrodynamic force and torque for rolling detachment model in the analysis. The required shear velocity and actual wind velocity for resuspension of particles with diameter ranging from 0.1 to 100 µm were evaluated, varied from 0.23 to 57.56 m/s and 0.82 to 2219.8 m/s, respectively. The effect of particle size and composition on the required removal velocity was also analyzed. Verified with the experimental deposited dust size distribution, large particles with diameter larger than 1 µm were effectively removed by wind. However, wind cleaning process for small particles was found not to be effective due to the large required shear velocity for detachment. In addition to particle sizes, the influence of compositions on the wind cleaning process can be negligible.