Influence of Internal Partition with an Opening on Purging Flow Rate of Wind-Induced Ventilation

¹ Osaka University 2-1 Yamadaoka Suita City, Japan
² University of Gävle SE-8017 Gävle, Sweden
³ Toyo University 5 Chome-28-20 Hakusan Tokyo, Japan

^* Corresponding author: toyosawa_kota@arch.eng.osaka-u.ac.jp

Abstract

The importance of natural ventilation has become more recognized for energy saving. Given the contemporary architectural designs, the utilization of wind-induced single-sided ventilation has become a prevailing format. This paper presents a wind tunnel experiment to assess the influence of a partition wall on the single-sided wind-induced ventilation rate considering the effect of wind pressure fluctuation. A rectangular building model whose shape was 1:1:2 (Height: Width: Length) was studied. The internal space is separated by an internal partition with an opening, and the position of this opening was varied as a parameter. The external wind direction was also changed from 0 to 180°.In order to assess the actual ventilation performance including ventilation efficiency, the purging flow rates (PFR) were also measured by the continuous dose method of the tracer gas technique. Here, two types of PFR were measured based on the target domain, i.e., dosing/sampling at only one room or two room. To evaluate the driving pressure, the instantaneous wind pressure coefficient and its fluctuation were measured at the positions of the assumed openings using the sealed model with a sampling frequency of 1.0 kHz.