Research On The Application Of Heterojunction Components In Building Envelope In Hot Summer And Cold Winter Area

The development of high-tech has brought people high-quality life,but also caused a lot of energy consumption,which is mainly reflected in building energy consumption.According to statistics,30 % of China ’s total social energy consumption is building energy consumption.In order to implement the important decision of the Party Central Committee and the State Council on carbon peak carbon neutrality,energy conservation in the construction field is imperative.At present,building energy conservation mainly reduces building energy consumption by optimizing building design and updating energy-using equipment.In order to further reduce energy consumption and achieve zero-carbon buildings,it is necessary to combine buildings with renewable energy,the most important of which is solar energy.At present,the combination of photovoltaic and building is mainly installed on the building envelope,and the installation scale of plane photovoltaic is higher than that of facade photovoltaic.This is because the facade photovoltaic installation in the building envelope will change the thermal performance of the building ’s overall envelope,affect the cooling and heating load inside the building,and may lead to an increase in the overall building energy consumption.In this regard,this paper first analyzes the correlation of several factors affecting photovoltaic power generation,and obtains the optimal design angle of the combination of photovoltaic modules and buildings on the basis of the maximum correlation factors,and then analyzes the influence of facade photovoltaic modules on building energy consumption through energy consumption simulation software.The main contents include the following aspects :Firstly,in the case of determining the type of photovoltaic material,the heterojunction module is selected as the research object,and several influencing factors of the working efficiency of the photovoltaic module are studied and analyzed.By collecting the power generation and environmental data of actual photovoltaic power generation projects,Pearson correlation analysis method is used to calculate the correlation coefficient of different influencing factors.It is concluded that the correlation between light radiation and photovoltaic power generation is the strongest,with an average correlation coefficient of 0.975.Secondly,the influence of temperature is analyzed.The correlation coefficient between temperature and light radiation is as high as 0.803,which shows that the influence of temperature can be replaced by the study of light radiation.The influence of air pressure is small,and the average correlation coefficient is only 0.041.There is a negative correlation between relative humidity and photovoltaic power generation,and the correlation coefficient is-0.714.Then,PVsyst software is used to simulate the planar photovoltaic modules and facade photovoltaic modules in the application of building photovoltaic modules.By comparing the solar radiation and unit power generation,the optimal design angle of the planar installation specification module is 2 ° azimuth angle and 23 ° inclination angle.The best azimuth angle for the installation of photovoltaic modules on the facade is 29 ° south by west.By comparing the optimal design angle power generation effect and the photovoltaic module power generation effect applied in the south direction,it is found that the power generation gain under the optimal azimuth angle design is only1 % compared with the south direction,and the feasibility of the south direction instead of the optimal angle design is obtained.Finally,the influence of installing photovoltaic modules on building energy consumption is studied.Combined with the power generation efficiency and actual situation of each azimuth of the facade photovoltaic module in Chapter 4,the facade photovoltaic module of the building is designed to be oriented to the south.Using EnergyPlus energy consumption simulation software,the heterojunction photovoltaic module is selected as the research object.Comparing the indoor cooling and heating load and heating and air conditioning energy consumption data of ordinary buildings and photovoltaic buildings under summer and winter conditions,it is concluded that the installation of photovoltaic modules on the building facade will reduce building energy consumption in summer and winter,and the energy saving effect in summer is as high as 19 %.By installing photovoltaic modules on the overall envelope of the building,the calculated annual power generation is about 1.5 times the annual energy consumption of the building,which shows that the installation of photovoltaic modules on the building envelope can not only reduce energy consumption,but also have the potential to be profitable.