Electrostatic force of dust deposition originating from contact between particles and photovoltaic glass*

Abstract

Charged photovoltaic glass produces an electrostatic field. The electrostatic field exerts an electrostatic force on dust particles, thus making more dust particles deposited on the glass. In this paper, the contact electrification between the deposited dust particles and the photovoltaic glass is studied. Meanwhile, the surface charge density model of the photovoltaic glass and the electrostatic force of charged particles are analyzed. The results show that with the increasing of the particle impact speed and the inclination angle of the photovoltaic panel, the charges on particles increase to different degrees. Under a given condition, the electrostatic forces acting on the charged particles at different positions above the glass plate form a bell-shaped distribution at a macro level, and present a maximum value in the center of the plate. As the distance between the particle and the charged glass decreases, the electrostatic force exerted on the particle increases significantly and fluctuates greatly. However, its mean value is still higher than the force caused by gravity and the adhesion force, reported by some studies. Therefore, we suggest that photovoltaic glass panels used in the severe wind-sand environment should be made of an anti-static transparent material, which can lessen the dust particles accumulated on the panels.

Electric field and force characteristic of dust aerosol particles on the surface of high-voltage transmission line

“…In deserted areas, the "electrostatic dust absorption effect" of DC transmission line is pronounced, so it is crucial to scientifically understand and analyze the force on dust particles. [44][45][46] In this section, the force on particles at different locations under the influence of the electrostatic field of high voltage transmission line is discussed based on theoretical analysis (Fig. 13).…”

Effect of photovoltaic panel electric field on the wind speed required for dust removal from the panels

“…In this section we quote the method proposed by Xie et al [20] Assuming that the particle radius is R 1 , r 1 , respectively, and D 1 = 2R 1 , D 2 = 2r 1 , the corresponding mass is m 1 , m 2 , the elastic modulus and Poisson's ratio of the particle are E i , ν i , the relative velocity during collision is v r then the contact area between the two particles during the collision contact can be obtained from the following equation: [33] A…”

“…Assuming that particles are uniformly charged, the charge after the particles collide with the plate under the action of the electric field is [20]…”

“…[17][18][19] As the development of PV technology, the power of a single PV panel continues to increase, and the intensity of the electric field generated around it becomes stronger. [20] The electric field generated by the photovoltaic panel itself has a strong attraction to the deposited particles, [21,22] which is bound to significantly increase the deposition of particles. [23,24] On the other hand, the collision between the deposition particles and the photo-voltaic glass panel is also accompanied by the electrification phenomenon, which result in a large amount of electrostatic charges on both the particles and the photovoltaic panel.…”

“…[23,24] On the other hand, the collision between the deposition particles and the photo-voltaic glass panel is also accompanied by the electrification phenomenon, which result in a large amount of electrostatic charges on both the particles and the photovoltaic panel. [20] The electric field generated by the photovoltaic panel will enhance the contact electric charge between objects, [25,26] which will inevitably increase the electrostatic force of the dust on the photovoltaic panel, thus affecting the working efficiency of the dust removal device with compressed air. Therefore, it is of great scientific significance to analyze the critical airflow speed of the dust removal device, which is designed by compressed air, under the action of electric field produced by photovoltaic panels.…”