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

In predicting flow rate of a cross-ventilatedbuilding, discharge coefficients obtained fromthe connected value of resistance coefficient ofopening based on the chamber method, and thewind pressure coefficients from a sealedbuilding are usually used. This method canpredict the flow rate well for the case of smallopenings. For the large openings, however, it iswell known that flow rate could beunderestimated because these are not based onactual condition. Authors aim to establish theprediction method of flow rate based on "powerbalance" inside the stream tube flowingthroughlaround a building. In order to predictflow rate by this method, transported powers onspecific sections and those losses between thesections need to be known finally. In this paper,therefore, the stream tube caught by the openingis determined by using CFD for the simpleshaped rectangular models as the first step ofanalysis. Finally, the transported power andpower losses are to be investigated.