Journal
BUILDING AND ENVIRONMENT
Volume 188, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.buildenv.2020.107450
Keywords
Wind tower; Natural ventilation; CFD; Ventilation performance; Indoor airflow arrangement
Funding
- Fundamental Research Funds for the Central Universities [22120180566]
- Shanghai Sailing Program [19YF1451100]
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This paper investigates the ventilation performance of wind towers in low-rise houses and their combination with different window configurations. The results show that optimizing the roof structure and slope can improve the ventilation capability of the wind tower, and setting a window on the windward wall is a more promising solution to improve cross-ventilation.
Wind tower is a traditional zero-energy natural ventilation device, which is capable of reducing building energy consumption and improving indoor environment. Many studies were conducted for its performance evaluation and design optimization, but most of them are more like underground applications. This paper aims to integrate the wind tower with single-sided natural ventilated house to arrange more desirable indoor air distribution. The ventilation behavior of the wind tower in a low-rise house was firstly compared with a common underground application. Then, effects of combining with different window configurations were investigated. CFD simulations were conducted using well validated numerical models. The results show that local wind environment must be well reproduced to accurately predict indoor airflow. Under the same incoming wind speed, the ventilation effectiveness of the wind tower in the low-rise house is 15%-40% lower than the underground application due to the effect of the separating flow above the roof. Optimizing the roof structure and slope to change the local flow field may improve the ventilation capability of the wind tower. When combining wind tower with different window configurations, setting a window on the windward wall is a more promising solution to improve cross-ventilation, since that the wind tower is in the negative pressure region above the roof. When the indoor temperature is higher than the outdoor, the exhaust wind tower will perform better due to the stack effect. The findings can provide practical implications for the performance evaluation and application of wind tower in contemporary house design.
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