Numerical Simulation Of Radiation Transmission Characteristics Of Particle Deposition Photovoltaic Panels

Photovoltaic power stations are usually built in areas with strong solar radiation,long sunshine hours and vast land area.But these areas also often face the environmental test of heavy wind and sand,less rainfall.Long-term exposure to such an environment,photovoltaic panels will inevitably adhere to dust,dust particles through reflection,scattering and absorption will greatly reduce the transmittance of photovoltaic panels,which will greatly reduce the output efficiency of photovoltaic panels.This thesis focuses on the effects of particle deposition on the radiation transmission characteristics of photovoltaic panels.The particle sedimentary layer is divided into sparse single particle sedimentary layer model and dense particle sedimentary layer model.The calculation model of pellet deposition photovoltaic panel is established,and the radiation transmission of particle deposition photovoltaic panel is solved by Monte Carlo method and Mie scattering theory.By simulating and calculating the spectral reflectance,spectral transmittance and bidirectional reflection distribution function(BRDF)of the photovoltaic panel composed of the particle deposition layer and the photovoltaic panel,the influence of the particle deposition on the radiation transmission characteristics of the photovoltaic panel was obtained.The effects of particle coverage,particle composition,particle size and incident light angle on spectral transmittance,spectral reflectance and BRDF of sparsely deposited monolayer photovoltaic panel were analyzed.The effects of thickness,particle composition,particle size and incident light angle on spectral transmittance,spectral reflectance and BRDF were studied by the dense particle sedimentary layer model.The results showed that the increase of particle coverage reduced the spectral reflectance,spectral transmittance and BRDF of the photovoltaic panels.The spectral reflectance and BRDF of the particle sediments were larger when the particle components with smaller refractive index accounted for more.The higher the absorption index,the more the particle composition,the lower the spectral transmittance of the particle sediments.When monolayer sparse deposition occurs,the increase of particle size will increase the thickness of monolayer sparse particle deposition layer,resulting in the decrease of spectral reflectance,spectral transmittance and BRDF of photovoltaic panel.When dense particles are deposited,the increase of particle size leads to the increase of spectral reflectance,spectral transmittance and BRDF of photovoltaic panel.The increase of incident light angle will result in the increase of spectral reflectance and BRDF of the particle deposited photovoltaic panels,and will also reduce the spectral transmittance of particle deposited photovoltaic panels.The increase of the thickness of the particle deposition layer reduces the spectral reflectance,spectral transmittance and BRDF of the particle deposition photovoltaic panel.