Tracer gas technique for quantifying air pollutants dispersion

Pao Yue-kong Library Electronic Theses Database

Tracer gas technique for quantifying air pollutants dispersion

 

Author: Lyu, Hongchao
Title: Tracer gas technique for quantifying air pollutants dispersion
Degree: M.Eng.
Year: 2015
Subject: Indoor air pollution -- Measurement.
Indoor air pollution
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Building Services Engineering
Pages: 1 online resource (51 pages) : illustrations (some color)
51 pages : illustrations (some color)
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2826145
URI: http://theses.lib.polyu.edu.hk/handle/200/8235
Abstract: 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.

Files in this item

Files Size Format
b28261458.pdf 5.115Mb PDF
Copyright Undertaking
As a bona fide Library user, I declare that:
  1. I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
  2. I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
  3. I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.
By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.

     

Quick Search

Browse

More Information