抄録
The increased density of buildings in urban areas in Japan over the past several years has meant that less outdoor wind blows into buildings. Additionally, houses with many or large-size of openings are difficult to build due to concerns about security and privacy. In the present study, we have investigated the cross-ventilation characteristics of void, monitor roof and wind tower for the purpose of improving the cross-ventilation in detached houses built in high-density urban areas based on wind tunnel experiment and flow-network model calculation. At first, wind-pressure characteristics of a detached house in high-density urban areas were obtained by the wind tunnel experiment. From this result, we found that it is difficult to ensure adequate cross-ventilation in houses located in high-density urban areas by only openings in the wall surface. So, void, monitor roof and wind tower have been investigated as techniques of improving the cross-ventilation. Wind-pressure characteristics of each technique were examined by wind tunnel experiment. And rates of cross-ventilation flow from cases (i.e., void, monitor roof and normal roof) were calculated by flow-network model using wind-pressure coefficients from previous experiments. It can be concluded that void is a very effective technique for improving cross-ventilation in detached houses.
