Simple and cheap air change rate measurement using CO2 concentration decays


Describes the use of cheap, portable analysers and loggers that allow easy recording of the CO2 concentration in a room or in the exhaust duct of a ventilation system.  The peak value of CO2 concentration during occupancy is an indicator of the minimum air flow rate per person.  Analysis of the decays observed when the occupants leave the building provides the nominal time constant of the ventilated space, which is directly dependent on the outdoor air flow rate from the ventilation system and infiltration.  Validates the approach by comparison with SF6 tracer gas measurements.

Primary Author(s): Foradini F., Roulet C-A

Source: Int. J. Vent. June 2002, vol. 1, no. 1, 39-44, 6 figs., 3 tabs., refs.

             BSRIA Abstract Doc 000103980 Abs 20022467

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