The Air Quality Evaluation Of The Underground Business Street And Carbon Dioxide Distribution Numerical Simulation

The21st century will be the century in which human beings will exploit the underground space in the perspective of the evolution history of urban building. With the increasing of the underground structures, indoor air quality has become a research focus. This paper is an underground commercial street indoor air quality study in a more comprehensive and systematic way, using many research methods, such as field measures, questionnaire investigation, theory analysis, and numeric simulation.Finished work is as followed. Count the testing data. Comparing and analyzing the thermal environment and pollutant distribution of the11partitions and the variation law and affecting factors of the contaminate concentration at different room conditions. Using the universal subjective questionnaire to conduct the questionnaire survey and analyze the results. By using grey method, the grey relation analysis of the indoor air pollutants affect the crowd subjective evaluation and the evaluation of11partitions of the underground street air quality were done. Flow field in the underground street in summer was simulated using Airpak software, the changing rules of indoor temperatures, carbon dioxide concentration, indoor air age, PMV and PPD in the circumstances of different person density were known from the analyses.The results indicate that pollutant concentration is lower in natural ventilation of the transition period; Volatile pollutant concentration of the non-transition is higher; The carbon dioxide concentration is closely related to the flow of people; The volatile organic pollutant and carbon dioxide are the main factors which affect the crowd subjective evaluation. Both the air quality in transition period and in non-transition period does not belong to the clean level, but transition period air quality is better compared with non-transition period. The indoor person density has a lager influence on the flow field and carbon dioxide concentration in the underground street.Through the above analysis, the countermeasures were put forward to improve the indoor air quality in the underground street.Figure [17] Table [34] Reference [60]...