Zonal model to predict air distribution and dynamic concentration of pollutant in ventilated rooms.

The first part of the paper will show some aspects of experimental research on air distribution in ventilated rooms. The study has been carried out to get an understanding of the air movement and the ventilation effectiveness by means of tracer gas measurements. It has been investigated the velocity and the distribution of the concentration in a two-dimensional isothermal flow issue of a linear supply opening. The second part of the paper will describe a proposed zonal model in 9 zones. This model is able to predict the steady-state behavior of ventilated rooms and the dynamic evolution of a possible pollutant concentration in such environment. The theoretical model is based on the flow element method according to the throw of an isothermal jet and on a typical configuration of a zonal model. Comparisons between experimental measurements and the zonam model results show a good agreement on the range of usual air change rate in the ventilated rooms.