Effects of envelope features and upstream buildings on ventilation performance of naturally-ventilated building

Abstract

In order to study the influence of building facade components (sunshade, wing wall and balcony, etc.) on indoor and outdoor air distribution and indoor natural ventilation in high-density cities being hot in summer and warm in winter, 18 different cases are established to stimulate the effect of natural ventilation frequency of different position in the room by using the computational fluid dynamics (CFD) numerical simulation method through changing the incoming wind direction (wind incidence angle <italic>α</italic>=0° and <italic>α</italic>=45°), the height width ratio of upstream turbulence buildings and vertical and horizontal facade components. The results show the target building generally has a better natural ventilation performance when the wind obliquely incidents on the building (45°). In addition, the effect on ventilation performance of wing walls is highly dependent on the environmental factors including the approaching wind directions, the orientation of the target building and height of the upstream building. The interaction of these parameters affects the flow field characteristics, and changes the effect of facade components on the natural ventilation efficiency of the target building. This study can provide reference for improving the indoor natural ventilation efficiency and air quality by the facade optimization design of the building.