Prediction of indoor air quality considering the concealed air leaks in theimproved houses

There are many infiltration routes in detachedhouses in Japan. These routs lead chemicalcompounds into the indoor spaces from theconcealed spaces.In this study, the effects of countermeasureswith airtight methods and ventilation methodswere cleared using a simulation program. Atfirst, the equivalent leakage areas in theconcealed spaces were measured using cutmodels. Next, the movements of chemicalcompounds were calculated using thesimulation program: "Fresh2006".The results showed that the concentrations arelower in the improved houses than those in thecommon houses in some cases. But the methodswith exhaust ventilation from crawl spaces orbeam spaces were not enough effective to Enlission froin pipes and ductsdecrease the indoor concentration. Therefore the effects of the methods with ventilation wereeffective only on the pollutants which generatein these concealed spaces.