Distribution Characteristics of Respiratory Aerosols in Enclosed Environments
Dispersion characteristics of respiratory droplets in indoor environments are important in controlling transmission of airborne diseases indoors. This study investigates the spatial concentration distribution and temporal evolution of exhaled and sneezed/coughed droplets within the range of 1.0-10.0μm in an office room with three air distribution methods, specifically mixing ventilation (MV), displacement ventilation (DV), and under-floor air distribution (UFAD). The simulation results indicate that exhaled droplets with diameters up to 10.0μm from normal respiration process are uniformly distributed in MV. However, they become trapped in the breathing height by thermal stratifications in DV and UFAD, resulting in a high droplet concentration and an increased exposure risk to other occupants. Sneezed/coughed droplets are more slowly diluted in DVAJFAD than in MV. Low air speed in the breathing zone in DV/UFAD can lead to prolonged human exposure to droplets in the breathing zone.
Respiratory droplets Displacement ventilation UFAD Transmission Airborne disease
Naiping Gao Jianlei Niu Lidia Morawska
Department of Refrigeration and Thermal Engineering,Tongji University,Shanghai,China Department of Building Services Engineering,The Hong Kong Polytechnic University,Hunghom,Kowloon,Hon School of Physical & Chemical Sciences,Queensland University of Technology,Australia
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
811-818
2009-11-06（万方平台首次上网日期，不代表论文的发表时间）