Influence of mixed and displacement air distribution systems' design on concentrations of micro-particles emitted from floor or generated by breathing

Particles deposited on surfaces and floors can be reintroduced into air through re-suspension; thus constituting a threat to humans’ health. The ventilation system configuration should reduce indoor air particle concentrations and ensure minimal deposition and re-deposition fractions over surfaces and floors. The purpose of this work is to compare the effectiveness of different mixed and displacement air distribution system configurations in removing re-suspended particles from indoor occupied space for two main scenarios of particle generation: floor emissions and particle generated at the breathing level. The performance was investigated using configurations with variable inlet/outlets sizes and locations by evaluating breathing level air quality. A computational fluid dynamics (CFD) model was developed to predict the flow field and particle transport in the space using ANSYS Fluent software. The model was validated by experimentation.