In recent years, the levels of air tightness and insulation of the house are becoming better for energy saving and improvement of the living comfort. However, the problem concerned with house dust because of the lack of ventilation rate has becoming serious. House dust includes the spore of the mould or corpses and feces of the mite and so on, which cause allergy, asthma and unspecific hypersensitivities. In particular, the possibility of having allergic reaction to house dust is particularly high for children whose breathing zone is near the floor. This is one of the reasons why allergic reaction symptom is increasing for them. Experiments and simulations were performed to study the flow and diffusion fields 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 the experiments, for the two cases, the characteristics of airflow within the whole room are generally similar except airflow close to the outlet. CFD simulations concerning flow and diffusion fields were done. The characteristics of airflow are similar for both experimental and simulation results. In the simulations, the volume-averaged concentration of house dust in the breathing zone increased once before it gradually decreased. From the data we can also conclude that slit exhaust ventilation strategy produced less house dust in comparison to ceiling exhaust.
|出版ステータス||Published - 2010 12 1|
|イベント||7th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings, IAQVEC 2010 - Syracuse, NY, United States|
継続期間: 2010 8 15 → 2010 8 18
|Other||7th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings, IAQVEC 2010|
|Period||10/8/15 → 10/8/18|
ASJC Scopus subject areas