So as to better understand and predict IAQ problems, the velocity field and distribution of local mean age of air were determined experimentally with three-dimensional anemometry and decaymode tracer gas measurements inside a classroom. We also performed 3-D numerical simulations of the velocity field in this room, using a CFD code. The time dependent concentration decay of tracer gas was simulated using the previously determined flow field in the pollutant transport equation. Relatively good agreement was found between the simulated and experimental concentration decay curves.
Summary report and evaluation of the Roomvent 94 conference in air distribution in rooms. The roomvent conferences are dedicated to problems if aero- and thermo-dynamics of ventilated rooms.
The wind approaching a building provided with openings has to make a choice; i.e. either to flow around the building or to flow through the openings. This selection procedure is dependent on both the external structure (shape) of the building and on its internal structure. In this paper the parameters controlling this selection procedure are explored. In order to clarify the basic process, simplified building models have been studied with a combination of wind tunnel studies, visualisation and CFD predictions.
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