Effect of Airspeed on Removal Performance of Particles in an UFAD Room
Air flow is delivered to the occupied region directly from the floor in under-floor air distribution system. Particle entrainment by supply airflow plays an important role in indoor particles. However, the effects of air speed on indoor contaminant particle concentration have not been well characterized. In this paper, a physical and numerical model was established to simulate the airflow field and particle tracks by using the Lagmngian method. Experiments were performed in a full-scale small chamber under four airspeed (0.21-7.6m/s) conditions. The size-resolved (0.110μm) particle concentration decay rates were measured. Experiments results showed that the indoor particle concentration decay increases with the mean airspeed, and larger particles exhibit greater effects than smaller particles. Furthermore, the re-suspension life of particles exhibits a large dependence on airspeed and size: it decreases more strongly with increased indoor airspeed of particles above 3μm than those below lμm. The calculations agree well with the experiments tendency.
Particle Under Floor Air Distribution System Resuspension Deposition Simulation
Can Li Nianping Li
School of Civil Engineering,Hunan University of Technology,Zhuzhou,China School of Civil Engineering School of Civil Engineering,Hunan University,Changsha,China
国际会议
The 6th International Symposium on Heating,Ventilating and Air Conditioning(第六届国际暖通空调学术会议)
南京
英文
928-935
2009-11-06（万方平台首次上网日期，不代表论文的发表时间）