Ventilation rates and inter cell air flow rates in a naturally ventilated office building.

Determines ventilation rates and intercell flow rates in naturally ventilated office building using multiple tracer gases. Subdivides the building into 3zones and seeds each zone individually with a different tracer gas. Monitors the time histories of the concentrations of all gases in each zone using non-dispersive infra red gas analysers. Calculates air flow rates from experimental data. Uses an in-house computer program which predicts the dispersion of a tracer gas in a multi-zoned environment, to compare the predicted time histories of concentrations with those obtained experimentally.