Wind Tunnel Tests of Pollutant Inter-flat Dispersion Characteristics in Slab-shape Multistory Residential Buildings

摘要

The dispersion of air pollutants in residential buildings has become an issue of public concern. Under single-sided and cross natural ventilation, gaseous pollutants can transport between flats with different routes through openings caused by wind effect. The objective of this study is to investigate the gaseous pollutants inter-flat cross contamination and dispersion characteristics in a slab-shape multistory residential building by wind tunnel tests, especially the evacuation effect on pollutant by cross ventilation. Sulfur hexafluoride (SF6) was used as tracer gas in wind tunnel tests. Under the prevailing wind direction condition with the wind velocity of 2.89m/s at the building height, the pressure coefficient and tracer gas concentration were monitored. By analyzing the measured data, the possible dispersion routes of gaseous pollutants were revealed qualitatively and quantitatively. The results show that compared with single-sided natural ventilation, the pollutant vertical inter-flat transmission can be avoided by cross ventilation.