Air change rate measurements in the Roulet villa at Apples. Mesure du taux de renouvellement d'air dans la villa Roulet a Apples.

The air change rate and the volume of heated air of the villa were measured by the constant concentration tracer gas method during a period of 11 days. The total volume of the villa is 1000 m3 and the heated volume 530 m3. It is built on six half-levels. The occupants continued their normal lifestyle during themeasurements. The Compact Equipment for Survey of Air Renewal (CESAR) was used with nitrous oxide as tracer gas at a concentration of 100 ppm. The mean global air change rate was 0.50/h. The rate rose to 0.56 if a bedroom window at the top of the building was open, and fell to 0.37 when all the windows were shut.