WIND-FORCED VENTILATION OF THE ROOM WITH A SINGLE OPENING : Ventilation based on mixing layer caused by the airflow along opening plane

Wind-induced cross ventilation is one of the key technologies for saving energy while controlling the indoor environment, and seems to be a crucial element of any sustainable building policy. However, it is sometimes difficult to arrange openings on two sides for cross ventilation of a room. In buildings in built-up areas, many rooms only have openings on a single side. Since the airflow rate for a single-sided opening is much lower than that for two-sided openings, it is important to study how we can increase the airflow rate for a singlesided opening using either passive or active techniques. In this study, the characteristics of wind-induced ventilation with single-sided openings were analysed through wind tunnel experiments. In some experimental cases, a small object was attached to the opening in order to increase the airflow rate. (It was assumed that this object replicated a pivoted window whose vertical axis was in the centre of the window.) In other experimental cases, circulation flow was artificially induced in the room used in the experimental model in order to increase the airflow rate. A synergistic effect from the fresh air entering through the opening was expected with the circulation.

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Prediction of Airflow Rate of Single-Sided Room in Cross Wind

Kono¹,

Kato²,

Ooka³

et al. 2008

Nihon Kenchiku Gakkai Kankyokei Ronbunshu

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Openable windows of multiple dwelling houses or office buildings are often put on the single-sided wall because of restriction due to architectural planning. Conventional prediction method of airflow rate based on the differential pressure coefficient works on the assumption that openable windows exist on the both, windward and leeward sides of the room. This method is not useful for the room with single-sided opening. The prediction method of air flow rate of single-sided room beneficial to design process is not sufficiently prepared.In this study, the characteristics of wind induced ventilation with single-sided opening are analyzed with wind tunnel experiment, in which wind velocity profile of the approach flow is created as well as wind velocity profile around a building in build-up area. The normalized airflow rate 'k' is obtained from the wind tunnel experiment for simple prediction of airflow rate of single-sided room. The simple prediction method is mainly based on the normalized airflow rate 'k' and assumed wind velocity around a building, which is decided by CFD simulation or measurement.

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WIND-FORCED VENTILATION OF THE ROOM WITH A SINGLE OPENING : Ventilation based on mixing layer caused by the airflow along opening plane

Cited by 6 publications

References 4 publications

Numerical analysis of wind-induced natural ventilation for an isolated cubic room with two openings under small mean wind pressure difference

Numerical analysis of wind-induced natural ventilation for an isolated cubic room with two openings under small mean wind pressure difference

A Wind Tunnel Experimental Analysis of the Ventilation Characteristics of a Room with Single-Sided Opening in Uniform Flow

Prediction of Airflow Rate of Single-Sided Room in Cross Wind

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