Study onAirflow around Building Roof for Design ofNatud Ventilation by Chmney- Part1 Distribution of wind pressure coefficient on a building roof -

There are some ways to promote natural ventilation, but this research focuses on chimney which is traditional ventilation method used for industry or fireplace. The goal of this research is to establish the guidelines for the design of chimney for natural ventilation of rooms. This paper reports the result of the wind tunnel test to study airflow around building roof As a result of wind tunnel tests, some tendencies were obtained. Wind pressure distribution maps on a rooftop of two models whose windward walls had the same size to each other were not similar; however, the half part of the distribution map on 100mmx200mm roof was similar to that on a 100 mmx 100mm roof The maximum wind pressure was observed at about 5mm from the edge on the windward for each model, and for each wind direction.