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Tracer Gas as a Practical Field Diagnostic Tool for Assessing Duct System Leaks
Abstract
A methodology is presented for using
tracer gas testing to detect and quantify
duct leakage in homes. Since air is
invisible, leakage of air from duct systems
often remains undetected. Smoke sticks
used in conjunction with blower doors are
excellent diagnostic tools for detecting
and locating leaks in the air distribution
system. The tracer gas tests described are
a good complement to these tools in the
detection, location, and measurement of
duct leakage.
Testing for house infiltration once
with the air handler on and again with the
air handler off indicates whether duct
leaks exist. In many cases, it is possible
to determine the leak flow rate. A second
part of the test, determining the return
leak fraction by comparing the tracer gas
concentration at the return and at a
supply, can provide more accurate
determination of the leak flow rate and
whether it is a supply or return leak.
The tracer gas test methodology
enables fairly accurate assessment of the
energy impacts of the leaks and whether
repair will be cost-effective. Finally,
the tracer gas test can be repeated after
repairs have been completed to ensure that
the duct leaks have been sealed.
Citation
Cummings, J. B. (1989). Tracer Gas as a Practical Field Diagnostic Tool for Assessing Duct System Leaks. Energy Systems Laboratory (http://esl.tamu.edu); Texas A&M University (http://www.tamu.edu). Available electronically from https : / /hdl .handle .net /1969 .1 /6563.