Comparison of air exchange rates measured with different methods and influencing factors: preliminary results of a field study involving asthmatic children

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Conference12th International Conference on Indoor Air Quality and Climate: 05 June 2011, Austin, Texas
Pages16; # of pages: 6
SubjectField monitoring study, asthma, ventilation, residents; Ventilation
AbstractTwo tracer gas methods were used to measure ventilation rates in a field study that involves characterizing ventilation and indoor air quality in 115 homes with asthmatic children. The perfluorocarbon tracer gas (PFT) based measurement was 7-day average and reflected the effects of occupant behaviors, while sulphur hexafluoride (SF6) based method was a short-term measurement with occupant influences minimized. A subset of data involving 70 homes was analyzed to determine the most influential factors associated with each method. The explanatory variables including building characteristics and occupant behaviours were collected using questionnaires. The median of the air exchange rates (AERs) during winter in the child?s bedroom was 0.28 h-1 (SF6 decay) and 0.21 h-1 (PFT technique). The difference was observed to be statistically significant. The most significant explanatory variables were year of construction for SF6-basesed AERs and frequency of child?s bedroom window opening during the 7-day period for the PFT-based AERs.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number54010
NPARC number20374763
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Record identifier09403ef6-890b-435b-8783-6a9281fab168
Record created2012-07-23
Record modified2016-05-09
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