Characterization of the behavior of dust particles impacting the surface of solar photovoltaic panels
Dust contamination has a serious negative impact on the efficiency of photovoltaic modules,and understanding the deposition mechanism of dust particles on the surface of the module is a prerequisite for effective dust removal.The high-speed camera technology was used to study the motion behavior of dust particles with different incident velocities impacting on the surface of the glass and varying densities of dust.The study shows that the critical trapping velocity of dust particles increases with the increase of dust accumulation density,and the critical trapping velocities of particles with dust accumulation densities of 20 g/m2,50 g/m2,and 100 g/m2 are 0.417 4 m/s,0.497 8 m/s,and 0.639 4 m/s,respectively.The probability of particle adhesion is negatively correlated to the incidence velocity,and positively correlated to the dust accumulation density and the cladding humidity,and the humidity of cladding affects the particle adhesion probability.The normal recovery coefficient of the particles is positively related to the particle size and the mounting inclination.When the amount of dust accumulation density is the same,the normal recovery coefficients of the particles all decrease with the increase of the cladding humidity.
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