Optimal Design Of Natural Lighting In Classrooms Of Colleges And Universities Based On Dynamic Daylighting Performance Metrics

With the development and construction of the city and the improvement of living standards in the world,reducing building energy consumption and improving energy efficiency has become the focus of current architectural research.Natural lighting is more conducive to improving indoor light quality and improving visual comfort than traditional artificial lighting.Moreover,the energy consumption of building lighting can be reduced by 20%~50%.At present,artificial lighting is still the main building lighting field in China,and the level of natural lighting and lighting needs to be improved.The natural lighting assessment index is also lagging behind.Therefore,combining the natural lighting design of classroom space,the dynamic lighting assessment index and the annual dynamic lighting simulation method are introduced.In order to promote the development of China's building dynamic lighting assessment and natural lighting design,it provides a theoretical basis for further improving the quality of light environment in education buildings.First of all,this paper collects and summarizes the characteristics of geographical environment and light climate in Ji'nan area through literature research,and surveys and surveys the light environment level of some teaching buildings in Ji'nan.It finds that the existing problems of natural lighting in university classrooms are mainly reflected in three aspects: 1)the amount of natural lighting in the room is insufficient;2)the quality of indoor natural lighting is not high.3)the application of natural lighting auxiliary measures is inadequate.Therefore,uneven illumination and easy glare phenomenon often occur in the classrooms of colleges and universities in Ji'nan,affecting the indoor light environment and visual comfort.Then,based on field survey data,a typical classroom space model in Ji'nan is established,and the annual lighting dynamic simulation of typical classroom space is carried out based on geographic orientation and orientation.The advantages of Daylight Autonomy,Continuous Daylight Autonomy,Maximum Daylight Autonomy,and Useful Daylight Illuminance were compared.The dynamic lighting evaluation index was more sensitive to natural light changes.In order to optimize the natural lighting condition,in order to optimize the daylighting of university classrooms in Ji'nan,the dynamic lighting index is used as the evaluation basis to simulate and analyze the factors affecting the lighting of side windows.It is concluded that the trend of the typical classroom space in Ji'nan is different from that of the typical classroom space,the size,location,shape,arrangement of the side windows,the transmittance of glass,the auxiliary measures of lighting(reflector length,depth of light,light guide height and light guide angle)will affect the indoor natural lighting effect.It provides a practical reference for the design of lighting factors and the application of lighting auxiliary measures in classroom.Finally,the above theory is applied to the natural lighting optimization design of university classrooms in Ji'nan.The lighting parameters of the side windows of the classroom are adjusted,and the appropriate lighting assistance measures are adopted to explore the relative optimal parameters of indoor light environment in different classroom units.In this paper,a general process of lighting optimization for existing buildings is put forward based on the above dynamic simulation and parameter optimization process.The lighting optimization strategy can be applied to other classroom space lighting design.