Study Of Summer Thermal Environment Of Atrium Space In Large Commercial Buildings In Beijing

In this paper,we discuss summer thermal environment of atrium space,hereinafter referred to as atrium space,which has a large area of transparent or translucent roof,in large commercial buildings in Beijing.The atrium space has the characteristics of continuous uninterrupted use time and high personnel density and so on.It has a high requirement for the space thermal environment.Based on the questionnaire survey,field survey and CFD software simulation,the author in this paper takes Raffles City MALL as a case,and chooses several other objects as a contrast to explore the summer thermal environment of atrium space in large commercial buildings in Beijing.This paper consists of three parts.The first part is to determine the study methods and study content,including the first chapter and the second chapter.According to the domestic and foreign literature review,determining the construction of Post Occupancy Evaluation(POE)as the guiding ideology,taking the questionnaire survey method,field survey method and CFD software simulation method as specific study methods.Based on the investigation and analysis of the architectural design factors of 22 atrium space in Beijing,combined with the actual situation and theory,seven related elements of the summer thermal environment of atrium space are selected to find the relevant laws and conclusions of the atrium space thermal environment.The second part is the main part,including the third chapter to the fifth chapter.The third chapter takes Raffles City MALL as the main research object,selects the other five atrium space in large commercial buildings as the contrast,and carries on the questionnaire investigation and the analysis.The reliability and validity of the questionnaire were verified by SPSS software and the questionnaire results were calculated.Through the longitudinal comparison of the data,the thermal environment impact factor correlation radar is obtained.Through the horizontal comparison of the data,we can ultimately get the influence of the air environment and space design of the various factors on the thermal environment.Among them,the fresh air freshness and the more relaxed atmosphere,the summer atrium space heat comfort more satisfactory.The fourth chapter is mainly based on Raffles City MALL,supplemented by U TWON MALL,the above two research objects to carry out thermal environment measurement and analysis.Measured content includes: air temperature,relative humidity,wind speed,black ball temperature and carbon dioxide concentration.The PMV value is calculated after the data is collated,and finally,the present situation of the summer thermal environment in atrium space was obtained.By comparing with the third chapter,the author finds the consistency of the results of the two chapter.First,the PMV values obtained from field tests are consistent with the subjective questionnaire.Secondly,the large spatial scale is the main factor leading to the overheating of the atrium,the lower wind speed and the decrease of thermal comfort.The fifth chapter using CFD software Autodesk Simulation CFD for the simulation of thermal environment in Raffles City MALL.First of all,the author carries on the simulation to actual usage to verify the feasibility of boundary conditions set method.Then,by changing the boundary conditions,impact analysis on effects of air conditioning,thermal disturbance factors,enclosure structure and sunshade on the thermal environment in summer,and the temperature distribution and airflow of the atrium in different working conditions are obtained.The third part is the conclusion and the prospect,namely the sixth chapter.In this paper,the author uses Raffles City MALL as an example to point out the influencing factors and laws of summer thermal environment in the atrium space of large commercial buildings in Beijing through temperature,relative humidity,wind speed and thermal environment comfort.Through the summary,the author first puts forward the suggestion of the optimization of the summer thermal environment in the atrium space from the control of spatial scale relation,control of envelope material and control of air conditioning and fresh air system.Secondly,from the spatial relationship design,the space shape design and the space decoration design,Optimization of architectural design.Secondly,the suggestions on the optimization of the design of the atrium space are put forward from the spatial relationship design,the spatial form design and the space decoration design.