Outdoor air delivery rates to occupants and age of air

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TypeArticle
Journal titleASHRAE Transactions
Volume102
Issue2
Pages313321; # of pages: 9
SubjectIndoor Air Quality; Indoor Environment; Indoor air; Qualité de l'air intérieur; Environnement intérieur
AbstractA simple and accurate technique to directly measure the outdoor air delivery rates to building occupants is presented. A few (two to three) measurements of tracer concentrations are sufficient for calculation. Experimental results show that the calculated outdoor air change rates from the tracer gas experiments agreed well with the outdoor airflow rates measured independently by nozzles. A relationship between the local outdoor air exchange rate and the mean age of air was derived. The proposed technique provides a way of simplifying the measurement of mean age of air and correcting experimental errors. Experimental results show that almost all the errors inthe mean age a/air (a maximum 0/20% in our tests) caused by inaccurate timing of the start of a tracer gas step-up process (tracer buildup) can be corrected by the proposed method. The underestimated ages of air in the step-down processes (tracer decay) were also successfully corrected.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
IdentifierIRC-P-3751
NRC number37905
5275
NPARC number20375913
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Record identifiera858afbc-d71e-4c6d-9486-ad9ebaff3371
Record created2012-07-23
Record modified2016-05-09
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