Study On The Transmittance And Temperature Performance Of Photovoltaic Vacuum Glazing

With the rapid development of human beings,the earth environment on which we live is slowly deteriorating.Coupled with the growing scarcity of natural energy,China,the United States,Europe and all over the world see energy-efficient,environmentally friendly green building materials as an important development direction.Solar photovoltaic module can effectively convert solar energy into electric energy,while vacuum glass has many functions,such as heat preservation,heat insulation,wind resistance and pressure resistance,etc.The development of photovoltaic vacuum glass technology plays an important role in the integration of photovoltaic architecture.At present,the thermal conductivity and film opening of photovoltaic vacuum glass at home and abroad A series of researches have been carried out on the requirements of photovoltaic modules,the design of thin-film cell modules with different materials,and so on.In recent years,there are many problems such as low efficiency of photovoltaic vacuum glass conversion,poor transmittance of photovoltaic vacuum glass,easy failure of photovoltaic modules and improvement of heat preservation and heat insulation performance,etc.,in recent years,there are many problems such as low efficiency of photovoltaic vacuum glass conversion,poor transmittance of photovoltaic vacuum glass,and so on.Based on the new photovoltaic vacuum glass designed by the Sino-British cooperation project as follows:1.This paper briefly introduces the integration of photovoltaic building,and introduces the photovoltaic vacuum glass foot module and its manufacturing process.In this paper,the characteristics of optical thin films,the calculation of optical film properties,the universal theorem of optical thin films and the design method are introduced in detail according to the coating method used in the simulation experiment.2.In this paper,the simulation experiment with COMSOL is carried out,focusing on how to use the simplest coating method to reduce the reflectivity of glass and improve the transmittance of glass.At the same time,it can reduce the production cost of industry.To achieve low-carbon environmental protection energy-saving standards,to achieve the requirements of China's green industry,we are committed to create a blue sky and white clouds of beautiful China.The photovoltaic vacuum glass designed by the Sino-British cooperation project is simulated and designed.It can be seen from the results that the transmittance of the self-cleaning film of titanium dioxide is about 90%for visible light band.For infrared and ultraviolet wave band,the fluctuation is large.For the single microcrystalline silicon film,the transmittance of the visible light band is about 80%.While for the single LOW-E film,the transmittance of the visible light band is about 85%.And for the photovoltaic vacuum glass,the simulated transmittance of the visible light band is about50%.Compared with normal glass,the output of photovoltaic vacuum glass is better than that of ordinary glass.It also reflects the rationality of the design,indicating that the design is reasonable and effective.It can meet the requirements.3.Firstly,the thermal insulation principle of photovoltaic vacuum glass is analyzed,and the corresponding heat conduction and thermal radiation equations are constructed.The photovoltaic vacuum glass in the Sino-British cooperation project,its most unique feature is the use of aerogel column supported vacuum gap,to make the glass thinner and lighter,to ensure the thermal insulation of the glass.On the other hand,the microcrystalline silicon film has higher surface emissivity and smaller transmittance,which makes the glass have better insulation performance.In this paper,the simulation experiment is carried out by using COMSOL software.Through the calculation of heat transfer flux and heat transfer coefficient,the actual values of ordinary glass are compared.The results of experimental simulation show that photovoltaic The heat transfer coefficient of vacuum glass is about 52.25%lower than that of ordinary glass.It can be concluded that the temperature performance is excellent and the energy saving and environmental protection effect is remarkable.In order to further study the effect of aerogel column,3D temperature simulation analysis of photovoltaic vacuum glass was carried out.Through the simulation analysis of photovoltaic vacuum glass with aerogel column and stainless steel column respectively,the conclusion can be drawn from the following results:using aerogel column instead of steel column,the central U value of photovoltaic vacuum glass was reduced by 0.2469W/(m~2·k)and total U value by 0.3365W/(m~2·k).On the other hand,the high surface emissivity and small transmittance of photovoltaic film make the glass insulation better.