Abstract
Wind tunnel studies of air change rates and mean air velocities in an atrium with a movable roof were carried out. The probability of exceeding the minimum air change rate is introduced to determine whether the minimum outdoor air requirement can be secured by wind only. The results show that the probability of the air change rate exceeding the required air change rate for the atrium is 90%, even in the case of the movable roof being closed. On the other hand, the mean air velocities near the openings become so fast that may disturb the normal air movement of air-conditioning. Consequently, some type of barrier to reduce the wind speed of the air entering the atrium is concluded to be necessary.
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