Abstract
A method for quantitative measurement of the overall air recirculation in ventilation systems is presented. The air recirculation is calculated from the concentrations of a tracer at three well-defined points, viz., the background concentration in outside air (C1), the tracer concentration in the recirculated air (C2), and the tracer concentration in the inlet air after the recirculation system (C3). The recirculation quotient is calculated according to the following formula: Q2/Q3 = (C3−C1)/(C2−C1). Q2 = recirculated airflow; Q3 = total inlet airflow including recirculated airflow. Thus, a quotient between flows is identical with a quotient between tracer concentrations. The method allows the usage of both natural tracers (e.g., contaminants, such as CO2, occuring in the examined building) and artificial tracers (e.g., fluorocarbon 12 or sulfur-hexafluoride). The method has been tested with good results. At these tests, the tracer was CO2 emitted from exhaled air and indoor activities in the buildings.
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