A Study on Ventilation Systems for Removing Indoor House Dust

This study evaluated various ventilation strategies for efficiently removing house dust in the indoor environment. Experiments and simulations were performed to study the flow and diffusion fields that are affected by different locations and shapes of outlets. In this study, two kinds of ventilation strategies were considered i.e. ceiling exhaust and slit exhaust. In each case, experimental measurements showed that the characteristics of airflow within the whole room are generally similar except for airflow close to the outlet. CFD flow field and diffusion field simulations were also made. The CFD characteristics of airflow were similar to the experimental results. In the simulations, the volume-average concentration of house dust within the whole room decreased gradually. From the results, a conclusion can be drawn that the volume-average concentration of house dust within the whole room is lower in the case of slit exhaust than ceiling exhaust. After a ventilation period of 30 minutes the CFD results showed removal efficiencies for the ceiling exhaust and slit exhaust of 15% and 26% respectively at a low air change rate of 0.5 h-1, while the removal efficiencies of ceiling exhaust and slit exhaust are 51% and 57% respectively at a high air change rate of 2.5 h-1