Li Q, Meng G
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

Displacement ventilation is acknowledged to be an efficient system for the removal of contaminants and excess heat from occupied zones of rooms, this system is aiming at supplying clean undiluted supply-air directly to the zone of occupation. Air flow rate, temperature and the design of the supply device strongly influence the parameters that determine thermal comfort. In the paper, one kind of displacement ventilation systems - ohair air supplying system is investigated. A full-scale experimental model is established, temperature field and velocity field are measured at different air flow rate, supply air temperature with four different chair air outlets. PIV (particle image velocimetry) technology is applied in measuring velocity field. The PD (percentage of Dissatisfied) in occupied zone is evaluated. The results show that this system has a stable temperature gradient, the vertical temperature difference between 0.1m (above floor level) and 1.1m is lower than 3 ┬Ěc in most cases. So a comfortable thermal environment is given by this displacement ventilation system.