Simulation on evaluation of Indoor air pollutant diffused in the crawl space of detached house

摘要

As the technology in building materials advances, the room air pollution caused by chemical compounds, and also by preservatives and insecticides for termite control, has become a serious problem. With Regard to the air convection in the house to contribute to the movement of the contaminants, there is stack effect, wind presssure, and mechnical ventilation as the driving forces for air movement, that is also much affected by the air tightness and ventilation path of the house. The room air pollution status caused by chemical substances sprinkled in the crawl space are studied by simulation of the temperature ventilation circuitry based on multi-rooms model that assumed non-residential spaces such as crawl space and partition walls as rooms. As a result of the simulation, it is clarified that the concentrations in the crawl space is affected a lot by the amount of gap and the air tightness of the floor, the concentrations in the residential rooms does not depend on house construction method, keeping approx. 50% of the concentrations in the crawl space, and the pollution status differs according to pressure balance, i.e. ventilation method.