The Research Of Urban Buildings Vertical Temperature And Humidity And Air Quality

With the development of society and the acceleration of urbanization process, urban population increased dramatically, leading to the city have been expanding, the scale of cities develop from the horizontal direction, cities also have to stand up straight development trend,Building height from a few metres, and dozens of rice, to now hundreds of metres, 100m building has been everywhere, the urban environment in horizontal and vertical direction have greatly changed. New,the total number of high-rise building in Chongqing rank second in China, more than Beijing, Guangzhou, Hangzhou and many other cities, second only to Shanghai. On the other hand, according to Xinhua News, China is about one fifth of the urban air pollution is serious, the 113 major cities more than one third of the air quality standards fall short of the national secondary air quality, motor vehicle emissions have been the main source of air pollution ,as the number of car increasing, automobile exhaust pollution is becoming more serious. Therefore, the proposed research topic of this article, focusing on the completion of the following research elements:Firstly, this paper analyzes the heat process, introduced heat exchange among the sun, air and the ground and thermal process of the vertical change of air temperature , temperature inversion and so on, and analyzes the characteristic of air movement in the city buildings and two methods of micro-climate studies: The parameters collection and distribution method parameters. Also analyse the outdoor environment of urban buildings and the main parameters influencing factors, and use ECOTECT software case study of the Three Gorges Square, analyse the shadow of the building in different seasons.Secondly, this paper also measured the pedestrian height of the Three Gorges Square in different regions of temperature, humidity and pollutant concentration and other parameters, using origin software process the date of the pedestrian height measuring point in the different seasons, analysis of temperature and humidity, the ground temperature and pollutant concentration parameter in different seasons, and estimate the source of pollutants.Thirdly, using of Matlab program process the measurement date of the vertical direction, analyse character of the different directions of air temperature near external surface,external surface temperature,outdoor air temperature and pollutant concentration in different seasons, analysis of outer wall construction show different heat source or heat sink effect in different seasons.Fourth, in order to study the thermal effect to the outer surface of the building , establish building exterior surface heat balance model, through reasonable assumptions and model simplified, calculate the different dircetion of the outer surface hourly temperature in chongqing in summer,analyse the relationship between the external surface temperature and the solar radiation, and compared with the measured value. Finally, through model simplified, establish a physical model of the Three Gorges Square, and base on the measured data , identify the boundary conditions of CFD simulation, analyse the distuibuting of wind field,temperature and humidity fields, external surface temperature and pollutant concentration field, and also compared with the measured value.