Experimental study on distribution of human exhaled aerosol particles in a full-scale chamber

The temperature and velocity distributions along the room height in a full-scale experimental chamber were measured. In order to simulate human exhaled droplets, an aerosol generator system based on the Collision type atomizer (Model 7388AGS) was used to generate poly-dispersed droplets. An aerosol spectrometer (Model 1.108 Grimm) was used to measure the concentration distribution indoors. A breathing thermal manikin and a self-made thermal manikin were used to simulate occupants. It is found that a trap phenomenon of exhaled droplet occurred in the breathing height near the particle source. There is a two-zone distribution of particle concentration along room height far away from the particle source. The human exposure to particles is related to the distance to the particle source. The thermal plume of human can entrain air from below the breathing zone and help improving the quality of the inhaled air.