Determination of Air Exchange Rates of Rooms and Deposition Factors for Fine Particles by Means of Photoelectric Aerosol Sensors

Abstract

Indoor and outdoor concentrations of airborne fine parti cles from internal combustion engines have been mea sured over periods of 24 h with a time resolution of 10 s. With this time series, the ventilation air exchange rate of different rooms has been computed using a novel ap proach to the solution of the mass balance equation. A 'mixing time' parameter has been introduced in order to account for the initial non-homogeneous distribution of the pollutants in the rooms. It is demonstrated that this method can be used to determine the impact of health- relevant outdoor particles on the indoor particle concen tration. This yields information on the protection a build ing offers against pollutants entering from outdoors.

Keywords

Air exchange Buildings Combustion Photo-emission Pollutants permeability

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