Nishimoto, N.; Sagara, K.; Yamanaka, T.; Kotani, H.; Kobayashi, T.; Takeda, S.
Bibliographic info:
29th AIVC Conference " Advanced building ventilation and environmental technology for addressing climate change issues", Kyoto, Japan, 14-16 October 2008

Conventionally, the flow rate of a crossventilatedbuilding is predicted by using theorifice equation. When the opening is small,flow becomes like infiltration through cracks, itis useful. However, the flow rate could beunderestimated when the orifice equation isapplied to the cross-ventilated flow throughlarge openings. The goal of this research is topropose the prediction method of the flow rateof a cross-ventilated building by considering thepower balance inside the whole stream tube. Itis needed to know the properties of the flowfield, but few measurements of the pressure orthe wind velocity around a cross- ventilatedbuilding have been conducted. To reveal theproperties of the flow around a cross- ventilatedbuilding, the wind tunnel test was conducted.The studied model in this paper has therectangular configuration provided with twoopenings on the opposite sides. The openingsize and the model depth were set up as theparameter. This paper presents the experimentalresults of the wind velocity measured byParticle Image Velocimetry (PIV) system, andthe totallstatic pressure measured by thepressure tube around the cross-ventilatedbuilding. Finally, differences in characteristicsof the flow field will be shown.