Few Caveats on Carbon Dioxide Monitoring.
Few Caveats on Carbon Dioxide Monitoring.
(211 K)
Persily, A. K.
IAQ Journal, Vol. 4, No. 1, 22-25, Summer 1994.
Keywords:
carbon dioxide; indoor air quality; tracer gas;
ventilation; occupants
Abstract:
While techniques exist to relate indoor carbon dioxide
concentrations to building ventilation and indoor air
quality, they are not as simple as sometimes suggested.
Some of the techniques can yield reliable results when
used correctly, while others can result in serious
errors. Using any of these approaches requires that one
understands the technique and the following factors are
considered: the outdoor carbon dioxide concentration;
the number of people in the building and the rate at
which they generate carbon dioxide; variations in the
number of occupants within the building and over time;
variations in the carbon dioxide concentration within
the building; the measurement uncertainty of the carbon
dioxide monitor being used; ventilation system operation
prior to and during the measurements; and, indoor
sources of carbon dioxide other than the occupants.
Building and Fire Research Laboratory
National Institute of Standards and Technology
Gaithersburg, MD 20899