Design Of Building Integrated Dynamic Solar-Concentrated Shutters And Research On Indoor Light Environment

There is a trend towards ecologically sustainable building skins,and energyefficient building skins represented by building-integrated photovoltaics have become a research hotspot.One of the key issues facing the promotion and application of building integrated photovoltaics is the impact that integrated photovoltaic modules can have on the natural lighting of buildings.Solving the problem of achieving efficient natural daylighting in PV buildings alongside capacity is of great significance to the development of PV buildings.Transmissive concentrating modules absorb only direct light when in operation,and scattered light from the outdoor environment can pass through the module into the interior to provide the necessary natural lighting for the building.This thesis designs an architecturally integrated dynamic light gathering louvre that takes full advantage of the cascading nature of transmissive light gathering technology to meet the capacity-lighting balance.Based on experimental and simulation methods,this thesis investigates the optoelectronic properties of linear Fresnel lenses,determines the basic parameters of the light gathering module and designs a new light gathering louvre module suitable for building integration;designs a light gathering louvre suitable for building integration based on the module to realise the dynamic integration of the module and the building;uses the optical analysis software Lighttools to Lighttools is used to quantify the impact of the louvres on the indoor light environment under different working conditions.Through a series of scientific research methods such as experiments,software simulations and collation analysis,the productivity characteristics of the concentrating louvre modules at different spacings and the impact on the indoor light environment after integration into the building have been studied to realise the versatility of the device on the building,to better adapt to the building,to improve the efficiency of comprehensive energy utilisation and to promote the promotion of solar energy utilisation technology.The results of the study show that the distance between the Fresnel lens and the solar cell and the deviation angle are important factors influencing the photovoltaic characteristics of the concentrator module.The suitable range for the distance between the Fresnel lens and the solar cell is between 47 mm and 53 mm,and the suitable range for the deviation angle between the Fresnel lens and the solar cell is within ±4°.The smaller the spacing,the higher the overall production capacity of the concentrating louvres for most of the year,as far as the range of rotation allows.Compared to ordinary glass windows and ordinary louvres,concentrating louvres improve the uniformity of illumination in the room,increasing illumination deeper in the room and reducing illumination at the windows.The use of louvres with different deviation angles in different seasons,specifically 15°-60° forward deviation in spring and autumn,30°-60°forward deviation or 60° reverse deviation in summer,15°-30° forward or reverse deviation in winter and 15°-30° forward or 15° reverse deviation in cloudy weather,can effectively improve the illuminance and indoor illuminance uniformity deep in the room.This study designs a dynamic concentrating louvre for building integration from the point of view of capacity-lighting balance,and investigates its suitable spacing and impact on the indoor light environment,which can provide a certain research basis and reference value for the design research of concentrating photovoltaic building integration,and can also provide new ideas for optimising the quality of indoor light environment in buildings.