Development Of Thermal-daylighting-electric Coupling Model Of Translucent Crystalline Silicon Photovoltaic Curtain Wall And Comprehensive Energy Efficiency

In today’s world,the construction industry accounts for nearly one-third of the total final energy consumption.Affected by the epidemic since 2019,China’s carbon dioxide emissions have also seen the second largest annual growth in history.In order to achieve China’s carbon peak and carbon neutralization as soon as possible,the Chinese government is constantly promoting the application of photovoltaic systems in the construction industry.Translucent crystalline silicon photovoltaic curtain wall is one of the important applications of building photovoltaic.It is necessary to study its daylighting-thermal-photoelectric power performance and energy consumption.This paper studies the coupling relationship between the daylighting model,thermal model and power generation model of translucent crystalline silicon photovoltaic curtain wall.Taking the indoor radiation parameters in daylighting and thermal calculation and the photovoltaic working temperature in thermal and power generation calculation as coupling parameters,the thermal-daylighting-electric comprehensive performance coupling model of translucent crystalline silicon photovoltaic curtain wall building is constructed.By building a comparative experimental platform between translucent crystalline silicon photovoltaic curtain wall and ordinary glass curtain wall,the parameters related to daylighting performance,thermal performance and power generation performance of monocrystalline silicon photovoltaic window under sunny and cloudy conditions are monitored.The characteristics and differences between the two are analyzed,and the thermal-daylighting-electric comprehensive performance coupling model of translucent crystalline silicon photovoltaic curtain wall building is experimentally verified.Based on the above thermal-daylighting-electric comprehensive performance coupling model of translucent crystalline silicon photovoltaic curtain wall building,the influence difference on the thermal-daylighting-electric performance of translucent crystalline silicon photovoltaic curtain wall building with different photovoltaic module distribution modes in different building thermal design zones in China.The thermal,daylighting and electrical calculation parameters of the above calculation model are connected to the energy consumption calculation model to simulate the annual energy consumption.The energy consumption of semi transparent crystalline silicon photovoltaic curtain wall buildings with different distribution modes of photovoltaic modules in different thermal design zones of Chinese buildings is analyzed,and the photovoltaic module parameters of semi transparent crystalline silicon photovoltaic curtain wall are optimized.The experimental and simulation results show that under sunny conditions,the translucent crystalline silicon photovoltaic curtain wall will cause the intermittent change of indoor hourly illumination from peak to trough,and make its indoor illumination lower than that of ordinary glass curtain wall.When the translucent photovoltaic curtain wall is adopted,the temperature of the photovoltaic cell back plate and the back wall temperature of the glass part are higher than that of the ordinary glass curtain wall,but the indoor air temperature is lower than that of the ordinary glass curtain wall.With the decrease of the transmittance of the ordinary glass curtain wall,the gap will be reduced.At the same time,when the temperature of the photovoltaic cell is high,it will have a great impact on the real-time power generation.When the working temperature rises to a certain extent,the power generation decreases when the solar radiation is high.Under cloudy conditions,the change trend of daylighting illuminance of translucent photovoltaic curtain wall is basically the same as that of ordinary windows.At the same time,the indoor illuminance of ordinary glass curtain wall is about 44% higher than that of photovoltaic curtain wall.After reducing the transmittance of ordinary windows,the gap is reduced to 25%.Since there is no influence of solar radiation,the wall temperature of translucent crystalline silicon photovoltaic curtain wall and ordinary glass curtain wall is basically the same as the outdoor temperature.For the translucent crystalline silicon photovoltaic curtain wall buildings located in the five thermal zones,the possibility of indoor uncomfortable glare gradually decreases with the increase of photovoltaic module coverage.Moreover,compared with other regions,hot summer and cold winter areas and mild areas have higher tolerance for photovoltaic coverage,and their indoor uncomfortable glare level is relatively lower.For different photovoltaic module forms,when the coverage of photovoltaic modules is high,the daylighting effect of striped photovoltaic module form is better than that of square photovoltaic module form.When the coverage of photovoltaic modules is low,the effect is opposite,but the daylighting effect of both is better than that of integral photovoltaic modules.Among the three PV module forms adopted,the working temperature among the three is overall PV module form > square PV module form > stripe PV module form,but the temperature difference between the three is small,the annual average temperature difference is less than 1 ℃,and the peak temperature difference is about 3 ℃.Therefore,the three different PV module forms have little impact on the power generation of PV curtain wall,and the total monthly power generation among them is less than 1%.The annual energy consumption of photovoltaic curtain wall buildings under different photovoltaic module forms and different photovoltaic cell coverage is compared and analyzed.Combined with the difference of daylighting performance of translucent photovoltaic curtain wall,the distribution mode of photovoltaic modules in different regions is optimized.For severe cold areas and mild areas,the Striped photovoltaic curtain wall with photovoltaic coverage of70% and 60% respectively has the best comprehensive effect of daylighting and energy consumption.For cold areas,hot summer and cold winter areas and hot summer and warm winter areas,the square distribution photovoltaic curtain wall with photovoltaic coverage of 60%has the best comprehensive effect of daylighting and energy consumption.