| In recent years,many large-scale centralized photovoltaic power stations have been built in China.But the temperature of photovoltaic modules during power generation is typically as high as 50?,and some even 80?.So the economic benefit of the photovoltaic power station is seriously affected,and the further popularization and the development of the photovoltaic power generation are not favorable.With the PV module's temperature increases,the power generation efficiency of the PV module decreases linearly.In this paper,by studying the characteristics of transparent insulating film: reflecting infrared light,a Nano-transparent thermal insulation film for PV modules was prepared in a laboratory.Then research on improving the temperature rise and output power of PV modules by transparent thermal insulation film was developed.The main study contents are as follows:(1)Study the relationship between temperature and PV module output.First,we introduce the basic structure of PV modules,focusing on the output performance parameters of PV modules under standard and non-standard conditions.Then,based on the analyzation about solar radiation characteristics and absorption limit of PV modules,we study the relationship between the infrared radiation and the increase of PV modules' temperature.Last,investigate the basic properties of the insulation material and the thermal insulation mechanism to proof the feasibility of its application to PV modules.(2)Research common coating material preparation methods and film coating processes.Considering the laboratory conditions,the thermal insulation coating was prepared by chemical blending-sol-gel method,and the transparent thermal insulation film was prepared on the PV module by the wire bar coating process.Then the spectral properties and surface topography of the film were carried out,and the mechanical stability and chemical stability of the film were examined by the weather resistance test of the film.(3)The thermal insulation film module was prepared,and the experiment was carried out.The temperature and output characteristics of the coated thermal insulation film of PV module were investigated.Then,we study the temperature,open circuit voltage,short-circuit current and output power characteristics of the coated thermal insulation film PV module under the solar simulator and outdoor sunlight.Last,the data of PV modules under solar simulator and outdoor sunlight were analyzed and plotted,and study the effect of the thermal insulation film on reducing the temperature of PV modules and increasing the output performance.After the above experiments and study,this article obtains the reviews:(1)Infrared light in sunlight is an important cause of temperature rise in PV modules.At the same time,the Nano-transparent thermal insulation film has the characteristic of reflecting infrared light.The test results of the thermal insulation film module in this paper show that: after coating the thermal insulation film,the infrared light transmittance of the module significantly reduced,and the visible light transmittance changes little,and the temperature of the PV module is significantly reduced,the open circuit voltage and output is improved.Therefore,the thermal insulation film proposed in this paper has great significance in improving the output power of the PV module.(2)Transparent thermal insulating film reflects infrared light and transmits visible light is closely related to the volume concentration of nanoparticles in the coating.When nanoparticles are evenly dispersed in the auxiliary film,the visible light transmittance and infrared reflectivity of the films are the highest,which can significantly reduce the temperature of PV modules and increase their output power.It is of great significance to extend the service life of PV modules and improve the economic benefit of PV power station. |
PDF Full Text Request