Study On The Seasonal Performance Characteristics And Adaptability Of Naturally Ventilated Photovoltaic Double Skin Facade

With the acceleration of urbanization and the increase of building energy consumption,the State Council promulgated the"Green Building Action Plan",strongly advocating the building energy conservation and emission reduction and the use of renewable energy in buildings,building energy conservation has great potential.A new type of building-integrated translucent photovoltaic glass(STPV)has attracted much attention from researchers and the market because of its ability to convert solar energy into electricity through photovoltaic materials.In this paper,the air flow characteristics of a new type of STPV-DSF in the light,electricity,heat and heat channels and the adaptability of the system under different seasons in different regions are explored by coupling DSF with STPV.Based on a full-scale laboratory in Jiaozhou,Qingdao,the operational parameters of traditional DSF,STPV-DSF(τ=20%)and STPV-DSF(τ=40%)in summer and winter in cold regions of China(Qingdao)were monitored.Four kinds of natural ventilation circulation modes are used in summer,and the thermal performance and power generation performance under different operation modes are analyzed.In winter,the thermal performance and power generation performance of closed and internal and external circulation modes are compared and analyzed.Finally,a Fortran mathematical model is used to analyze the STPV-DSF temperature field under different operation modes in summer and winter,the operation of the model in different regions and different climates can be predicted by changing the parameters in the later stage.The results show that the photovoltaic double-skin fa(?)ade with four natural ventilation circulation modes can effectively block the heat transfer outside and generate electricity.The temperature difference between inside and outside glass of PV double-skin facade with 20%transmissivity is more than 10°C,with solar heat gain coefficient less than 0.1,and the U value of about 2 W/(m~2·K).The solar heat gain coefficient is more than 0.15 and the U value is about2.5 W/(m~2·K)with the glass temperature difference between inside and outside of the photovoltaic double-skin facade less than 5°C with 100%transmissivity.The external circulation mode takes the heat away from the cavity better,which is the best way to reduce the heat gain in the room.The through circulation mode only strengthens the natural ventilation and cannot take the heat away from the cavity effectively.Compared with the external circulation mode,the internal and external circulation mode can form the ventilation form from inside to outside.The internal circulation mode brings the heat from the cavity into the room,which forms the air conditioning load and is an unfavorable circulation mode.In winter,the100%transmittance window has a higher radiation and conduction heat flux density,and the20%transmittance window has a lower SHGC due to the lower heat flux density of radiation and conduction,which is an unfavorable structure.The noon ventilation mode utilizes higher ambient temperature and solar radiation during the time period of 12:00-13:00 to provide fresh air to the room while reducing heat dissipation,which is a better operating mode in winter.Comprehensive consideration throughout the year,the 20%transmittance window greatly reduces indoor heat gain in summer,and the overall energy saving effect is better than the 100%transmittance window.The semi-transparent photovoltaic double-skin curtain wall is based on the experiment of Qingdao in the cold area in summer to establish a mathematical model,and the operation of the translucent photovoltaic double-skin curtain wall is decomposed into three mutually coupled sub-models,namely the optical model,the electrical model and the thermal model.Qualitative model.The operating parameters were obtained through model calculation,and the data measured in Qingdao experiment were used for verification,the reliability of the model was obtained,and the adaptability study was carried out.This model is extended and applied to cities and buildings in other regions and different climate types.Using Changsha as the representative of cold winter and hot summer zone and Hong Kong as the representative of warm winter and hot summer zone to study the adaptability of this model,the data shows that the application of this structure can effectively isolate the heat transfer from outdoor to indoor in summer.The temperature difference between the inner and outer skin is large and the SHGC is small,While improving the indoor thermal environment,photovoltaic power generation can also be carried out to save energy.