Research On Light And Thermal Environment And Energy-saving Design Strategy Of Atrium In Large-scale Public Buildings

With the development of building materials and construction technology,public buildings are constantly moving towards large-scale,which brings a series of problems such as insufficient lighting,poor ventilation and poor thermal environment.The introduction of atrium space solves these problems well.However,due to people’s lack of understanding of the ecological performance of atrium,large-area lighting and large-scale atrium space not only does not realize the original intention of energy conservation,but also increases the energy consumption of atrium.This problem needs to be solved urgently.In this paper,the methods of field research and computer software simulation are used,through comparative analysis and quantitative analysis,the photothermal environment and energy consumption of large public building atrium in Suzhou area are studied and explored in a certain depth.Firstly,eight large-scale public buildings in Suzhou area were investigated by field survey and questionnaire.The characteristics of atrium space,photothermal environment and energy consumption in Suzhou area were analyzed and summarized,and the four factors affecting atrium photothermal environment were summarized: lighting surface orientation,curtain wall performance,spatial scale and shading measures.Then the Eecotect software was used to establish the original atrium building model,and the control variables were used to simulate the influence of different factors on the atrium photothermal environment.On this basis,the energy-saving design strategy of atrium based on photothermal environment is proposed.The main conclusions are as follows:(1)The direction of atrium of large public buildings in Suzhou area is south-north direction,and the direction of east-west atrium lighting surface is avoided as far as possible.Through calculation,it is found that the best lighting surface direction of atrium in Suzhou area is 20 south-east to 15 south-west.(2)The atrium curtain wall material selection should give priority to meet the requirements of thermal performance,and then consider lighting requirements,curtain wall selection mainly consider the material of the heat transfer coefficient and shading coefficient of two parameters,according to the Suzhou area climate environment and the heat transfer coefficient is the most important,the heat transfer coefficient should be controlled in 2.3 ~ 0.9 w /(㎡ k),shading coefficient should be controlled in 0.5 ~ 0.6.(3)The appropriate atrium space scale is conducive to reduce energy consumption,when SAR=1,the less energy consumption of atrium,and the smaller the difference between the atrium side distance and height,the smaller the contact area between atrium and parent building,the less energy loss between regions,the more conducive to energy conservation.(4)Shading facilities are varied,Suzhou area south lighting surface appropriate uses horizontal sunshade,east-west appropriate uses vertical sunshade baffle,indoor sunshade is suitable for each toward the lighting surface.Finally,the paper emphasizes that the energy-saving design of atrium from the angle of architect’s control can reduce the energy consumption of atrium.Energy conservation is an unavoidable topic for architects in the future,and puts forward the shortcomings of the research and further improvement work.