An automated air infiltration measuring system using SF[6] tracer gas in constant concentration and decay methods

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TypeArticle
Journal titleASHRAE Transactions
ISSN0001-2505
Volume85
Issue2
Pages385395; # of pages: 11
Subjectair infiltration; measurement systems; gaseous state; air flow; buildings; Air flow/Wind pressure
AbstractOne method of measuring rate of air infiltration in buildings involves the use of small amounts of a tracer gas. The concentration of the gas, which is measured at regular intervals, provides the basis for evaluating the infiltration rate. In the following paper, two bases for such evaluations are discussed - the decay method and the constant concentration method. A system is described which automatically operates a portable electron capture detector/ chromatograph and measures parts per billion concentrations of sulphur hexafluoride (SF[6]) in air. It samples air on a 1-min. cycle. In the decay method, the slope of concentraion vs time on a semilogarithmic plot can be used to compute the infiltration rate. In the second method, the system injects SF[6] at the rate required to maintain the tracer gas at a fixed, predetermined level. The infiltration rate is proportional to the rate at which the tracer gas must be injected.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
IdentifierDBR-P-949
NRC number18835
1503
NPARC number20378643
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Record identifier4e8dd9df-0d59-4eb4-ae8d-7f8db008c1b8
Record created2012-07-24
Record modified2016-05-09
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