|Tracer gas technique for quantifying air pollutants dispersion
|Indoor air pollution -- Measurement.
Indoor air pollution
Hong Kong Polytechnic University -- Dissertations
|Department of Building Services Engineering
|1 online resource (51 pages) : illustrations (some color)
51 pages : illustrations (some color)
|Indoor air pollutants possible cause health issues to building users, the susceptive groups of elder, youngster, and those with chronic diseases. Airborne diseases transmission is one of typical examples. In order to predict the risk of inter-flat crosscontamination between adjacent flats on the same floor, dual tracer gas technique consist SF6 and CO2 was employed to simulate the air pollutants dispersion between index room and two opposite rooms. Three rooms' layout is showed in figure 1.The most likely airborne transmission, dispersion and routes, are investigated through the setting of closed and opened modes in the current study. The measurements were conducted from February to May of 2015, covering the peak season of influenza. And the results showed that the window nearby the corridor was the main route of the inter-flat air pollutants dispersion. At the scenario of window open mode with low corridor wind speed, there was found that about 10% and 11% tracer gas (SF6) source from index room could be measured in the very opposite room and diagonal opposite room. At the scenario of window closed mode with low corridor wind speed, there was found that about 13.6% and 9% tracer gas (SF6) source from index room could be measured in the very opposite room and diagonal opposite room. The data is showed in table 9. The result might indicate that open window action might reduce the risk for air pollutants dispersion between two very opposite rooms, while it might increase the risk for air pollutants dispersion between two diagonally across rooms.And data showed that the source transmit from index room to the two opposite rooms can be up to 10.5% and 11.8%, at the scenario of window open mode with outdoor wind orient north. Data showed that the source transmit from index room to the two opposite rooms can be up to 13.71% and 9.15%, at the scenario of close mode with about corridor wind speed reaches about 0.16m/s.
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