Kobayashi N, Yamanaka K, Kikuchi S
Bibliographic info:
Sweden, Stockholm, KTH Building Services Engineering, 1998, proceedings of Roomvent 98: 6th International Conference on Air Distribution in Rooms, held June 14-17 1998 in Stockholm, Sweden, edited by Elisabeth Mundt and Tor-Goran Malmstrom, Volume 1

Effective ventilation systems for a factory where various kinds of contaminant are discharged from many point sources are investigated in this study. Two ventilation systems are examined by scale model experiment using tracer gas. One system supplies fresh air and exhausts indoor air through the ceiling; the other has the inlet in the floor and outlet in the ceiling. Each system has a hanging wall installed at the ceiling, a device for immediate removal of the contaminant before it diffuses into the whole space. The performance of these ventilation systems is evaluated by an index of contaminant removal effectiveness. Results indicate that the hanging wall system can be very effective to ensure good indoor air quality if properly designed. The system with fresh air supply from the floor and a long hanging wall was the most effective. This system reduces the spatial averaged concentration in the occupied zone to 60% of the complete mixing concentration and therefore improves the air quality.