Transportation of particles in convection flows

Experimental results of the particulate contaminant distribution of resuspended particles inconvection flows from different heat sources with different ventilation systems and layoutsare presented. It was concluded that the ventilation system did not resuspend particles fromthe floor, walking in a contaminated area however did resuspend particles and a large numberconcentration of fine and ultrafine particles was measured in the breathing zone of personsimulators (sitting on a chair, in a wheelchair or lying in a bed). The geometry of thesimulators and the layout of the room had a big influence on the exposure. The particleconcentration in the convection flows was much higher with displacement than with mixingventilation indicating a higher exposure risk. As potential health problems are more closelyassociated with particle number or surface area than with particle mass this study can be ofinterest when designing a ventilation system.Qc 2012020