The impact of the air distribution method in ventilated rooms on the aerosol particle dispersion and removal: The experimental approach

Experimental results showed that at lower air change rates, one-way mixing ventilation directed particles towards air exhaust diffusers more efficiently, while four-way mixing ventilation enabled more particles to remain airborne. At higher air exchange rates (3 and 4 ach), mixing ventilation with one-way air supply prevented aerosol particle transport to the opposite side of the room. The displacement air distribution appeared to be rather inefficient in the removal of particles from the chamber, which was reflected by the relatively high age of the air (of average 16.7 s at 3-4 ach) compared to the mixing ventilation (of average 9.9 s at 3-4 ach).