Settling And Erosion Study Of Sand-dust On The Surface Of Solar Photovoltaic Modules

With the continuous development of social economy,the increasing demand for energy,a large number of energy consumption has led directly to more and more serious air pollution problems in recent years.Solar energy is a clean,harmless and the development potential of huge renewable energy,by the community of all ages.As we all know,China's solar resources better areas for the northwest region,is very conducive to large-scale development and utilization of solar energy resources.But the desertification in the region is more serious.The climatic characteristics make the surface of solar PV modules produce subsidence,erosion and other behavior.In this paper,the hybrid model and DPM model,in fluent,are used to simulate the settlement and erosion behavior of dust on the surface of PV module.The specific research contents and results are as follows:(1)The influence of dust volume fraction on the settling distribution of dust on the surface of PV modules.The results show that: The settling distribution is same when the volume fraction of inlet is different,except that the volume fraction of each surface of PV module is different.In addition,the volume fraction of the maximum subsidence area is 1.14 times of the volume fraction of the inlet.(2)The influence of the inlet wind speed and the installation angle of the solar PV module on the settling and the erosion rate distribution of dust on the surface of PV modules were analyzed.The results show that: When the wind speed is increased,the layer of the dust on the surface of PV module and the maximum erosion rate are gradually increased,and the settlement of the dust on the surface is more uniform with the increase of the installation angle.However,the maximum erosion rate decreases with the increase of installation angle.(3)Dust particle size on the settling and the erosion rate distribution of dust on the surface of PV modules were analyzed.The results show that: When the inclination angle is less than 45°,with the increase of particle size,the settlement is more uniform.And when the inclination angle is more than 45°,with the increase of particle size,the dust settlement shows the characteristics of scattered concentration.Furthermore,the settling distribution of the mixed particle size is mainly determined by the particle which size is larger.With the increase in particle size,the maximum erosion rate of change is not obvious,indicating that the particle size is not the main factor of affecting the erosion rate.(4)Calculate the dust settlement and maximum settling density of the surface.The results show that with the increase of inclination,the settlement increases.However,when the inclination is constant,the amount of settlement decreases with the increase of wind speed.The maximum settlement density increases with the increase of the wind speed,and when the installation angle is 45°,the maximum settlement density reaches the maximum.(5)Wind direction angle on the erosion rate distribution on the surface of PV modules is analyzed.The results show that:The erosion rate of the surface increases with the increase of the wind direction angle,and reaches the maximum when the wind angle is 75 °.(6)Sand mass flow rate on the settling and the erosion rate distribution of dust on the surface of PV modules is analyzed.The results show that: with the increase of mass flow,the maximum erosion rate increases first and then fluctuates.Finally reaches the maximum value when the mass flow rate is 0.35 kg/s.