Study On Optimization Of Air Distribution In Indoor Thermal Environment Reconstruction Of Existing Public Buildings

With the advancement of urbanization in China,the area of urban buildings,especially public buildings,has grown rapidly.In 2016,the area of urban public building in China has reached 11.7 billion m~2,while the proportion of public buildings in new buildings accounted for 34%.At the same time,it means that the scale of existing public buildings is continuing to expand.Due to the unperfect indoor environment design standards and specifications in early time,the indoor environment of some existing public buildings is more prone to problems than the new public buildings,so it has been receiving much attention.In order to improve the comfort of existing building users and improve the indoor environment of the building,the Ministry of Science and Technology and the Ministry of Housing and Urban-Rural Development approved the“Eleventh Five-Year Plan”,“Twelfth Five-Year Plan”and“Thirteen Five-Year Plan”projects to promote the transformation of existing buildings since 2006.In order to improve the indoor thermal environment of existing public buildings,this paper firstly combs the research status of thermal environment of public buildings in China.According to the thermal comfort interval given in the norms,the measured data of the indoor thermal environment of public buildings for Chongqing,Shenyang,Guangzhou and Beijing are analyzed and it finds out that about 50%of the building’s indoor thermal environment deviated from the thermal comfort zone in the air-conditioning season,and the existing indoor thermal environment problems of existing public buildings were found in combination with the thermal environment satisfaction questionnaire.Taking lateral air supply and top air supply as research objects,the characteristics of the thermal environment created by these three airflow organization forms are analyzed.The key factors causing the indoor thermal environment under different airflow organization forms,namely the air supply speed,the air supply port height and the air supply angle,were determined;the model was established based on the measured data,and the intrinsic relationship between different key factors and the thermal environment was further studied.Optimization direction of key factors that affecting the thermal environment was also studied;corresponding to the indoor thermal environment problems of existing public buildings,strategies based on optimizing air distribution to improve indoor thermal environment are proposed.