Qualification of ventilation systems.

The results presented here supply values for the room ventilation efficiency of a number of configurations covering as many as possible of the ventilation systems encountered in actual practice. The study is based on experimental results and numerical simulation. Using a few configurations experimented-on, simulations were performed using CFD code, which in particular allowed the reliability of calculations to be checked. The simulation tool was then used in such a way as to arrive at results that could be applied in practice. It was thus found that the air renewal rate has little effect on efficiency, whereas the combined effects of the thermal behaviour of the air stream, and the position of the inlet and outlet orifices, play a decisive role.