The Research On Pollutant Diffusion Of Indoor And Outdoor In Cluster Space

Air pollution of urban is growing a seriously problem. This phenomenon threatens all people’s health which lived in urban indoor and outdoor space. The environment issues of urban is need to find the ways and means what can controlling and reducing pollutant concentrations indoor and outdoor. It is necessary to study the vehicle exhaust pollution sources diffusion from outdoor to the entire indoor in forward-proliferation in the gaseous pollution in the city, but also consider the presence that when the indoor strong sources diffusion to the outdoor space entry will reverse the pollutants diffusion in the exhaust gas. Further large-scale urban morphology analysis depends on the established boundaries of urban, for the planning and design of each specific empty plots range to be considered is based on the growth oriented city planning cell element that is like the smallest group construction and evolution of fission final form best fit to space shape design of the land. Therefore, the primary research is the urban boundaries that in scope of group building space planning and design, but groups of indoor and outdoor architectural space pollutant dispersion factors have the diversity and complexity of features. But priority study of urban air pollution often be limited in the motor vehicle exhaust pollutant from the outdoor to indoor and outdoor, ignore when there is a strong pollution source term when indoor to outdoor space reverse diffusion of waste air pollutants.Another is urban morphology analysis with large-scale relies on the fait accompli of city space and its established boundaries, but for each specific field blocks within the scope of the planning and design,that is based on the planning to consider growth form minimum cell element,group buildings in a city combination, and evolution eventually form the most suitable for the land space form design.the space cluster building became the first determine the boundaries of planning and design, but the cluster building space between indoor and outdoor pollutants diffusion factors have the characteristics of diversity and complexity.In this paper, main purpose is master the double diffusion characteristics of pollutants law methods of urban construction of indoor and outdoor space. Study space of the urban clusters, using the basic theoretical analysis, the field measurements and the numerical simulation validation of analytical methods to predict extended combination of the three, the paper mainly expand the following related the study:First of all, according to building function and location of pollutants source term is defined architectural space type groups; by convection heat and mass transfer analysis and main factors indicates the presence of diffusion parameters of indoor environment pollutants coupling, which in addition to wind, temperature and humidity also affect dispersion of pollutants; atmospheric pollution dispersion models and basic computing model pollutant dispersion viaducts on the establishment of a diffusion of gaseous pollutants consider the indoor and outdoor pollutant double diffusion mathematical model, involved and simplified the main factors of double diffusion of indoor and outdoor pollutants to guide the design of the different types of groups in the field of architectural space indoor and outdoor tracer gas sync test and find the right relationship between the weight of each factor.Secondly, the statistical analysis of 40 urban transport canyons space environmental parameters within the main downtown of Xi’an, through statistic the group building shape factor, leaf area index and CO source strength on the basis of data obtained eight kinds of field measurements of the six factors of working conditions be based on sensitivity analysis BP neural network various factors affect each other, get their weight and building space microclimate design methods; and for the living space type street canyons and industrial production space and field test methods single building’s indoor and outdoor space in different seasons continuous use day and night respectively, were analyzed in the building different construction type and function space, indoor and outdoor pollutants bi-proliferation laws and multiple linear regression equation, numerical simulation the boundary conditions of the main factors in the design of a major expansion of simulation parameters, such as environmental parameters wind direction, form factor and the availability of the building cluster factor and with or not with green plant.Finally, through measurement error analysis and numerical simulation, establish a numerical simulation model of indoor and outdoor pollutant dispersion in Xi’an regions. The seven kinds of layout diversified groups, followed by a major expansion of its simulation parameters change to dimensionless concentration as a measure derived in Xi’an Preferred cluster programs and single building design optimization program recommendations.