Abstract
Natural ventilation is application of natural drift power of wind. Wind can enter and exit buildings through the openings on facades. Hence, Form of facades can impact the air flow behaviour and consequently natural ventilation because they can change the pressure distribution on facades. Moreover, wind pressure difference between windward and leeward facades of buildings is the most important factor affecting natural ventilation. So, it is worthy to focus on facade details in order to enhance natural ventilation. Particularly, geometrical details of facades such as protrusions and indentations e.g. balconies can be considered effective elements on average pressure distribution on both windward and leeward facades, changing pressure difference between these facades. This difference can drive the air flow towards interior spaces significantly. Although this basic rule has been used by different researchers in order to increase natural ventilation buildings, the most research has been studied buildings with flat facades. Therefore, this study aims to investigate effects of balcony types on the natural ventilation. Three types of balcony are simulated and the wind pressure distribution on the windward and leeward facades are analysed. All these simulations are carried out for normally (perpendicular) and obliquely incident wind. This study is performed with Ansys Fluent 18 for all simulations. The results showed that balcony types can affect the pressure distribution on the windward and leeward facades of buildings, leading to the more or less pressure difference between these two facades. These results show that protrusion (protrusive balcony) can cause more complicated pattern of the wind pressure on facades than the others. Also, Re-entrant balcony causes the more pressure differences between the windward and leeward facades and enhances natural ventilation of buildings more considerably than the protrusive one.
Highlights
IntroductionTo predict how balconies on facades can affect the natural ventilation of buildings, various experiments or simulations related to air flow are needed
EfΔfPects of balcony types on the natural ventilation were discussed in this paper
Protrusive balcony could make Cp distribution more complex rather than the others. These results show that protrusion can cause more complicated the pressure wind on facades, indentation can result in more similar distributed pressure coefficients
Summary
To predict how balconies on facades can affect the natural ventilation of buildings, various experiments or simulations related to air flow are needed. All this process requires data namely pressure coefficient to analyse natural ventilation (Costola et al 2009). The study carried out on building appurtenances resulted that balconies can cause more complexity in the air flow behaviour surrounding buildings and decrease wind loads on facades (Stathopoulos and Zhu, 1988). Wind pressure distribution on windward façades is much more complicated than leeward facades and balcony can enhance natural ventilation (Chan and Chow, 2010). This study aims to investigate effects of balcony types (protrusive, re-entrant and semi protrusive-semi reentrant balconies, presented as balconyp, balconyr and balconys respectively) on the natural ventilation
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