Abstract
Optimisation of shading devices in buildings is a broadly investigated topic; however, most studies only focus on a single façade orientation, since the observed buildings are typically located in high latitude regions. However, in tropical regions, optimisation of all façade orientations is required due to the relatively high solar radiation and long sunshine duration. While adaptive shading devices are a promising solution, they are not without disadvantages, and as such a combination of adaptive shading devices and a fixed shading device shall be considered. This research therefore aims to design the optimum internal shading devices on four façade orientations of a high-rise office building in a tropical city, considering fixed and adaptive shading design options, and to determine the impact on annual daylight performance using computational modelling and simulation. The simulation is carried out under: (1) fixed design option, focusing on the numbers and width of slats; and (2) adaptive design option, focusing on the slat angle on various conditions. It is found that both sDA300/50% and ASE1000,250 are only influenced by the orientation. Under the fixed design option, the sDA300/50% and ASE1000,250 targets can be achieved only on the north and south façades, and accordingly the adaptive design option shall be implemented on the east and west façades. Overall, this study contributes to knowledge regarding the optimisation of shading devices in high-rise buildings in the tropics, considering the daylight admission from the four cardinal orientations.
Highlights
This study focuses on optimising internal, horizontal shading devices that are exstudy focuses on optimising internal, horizontal shadingillumination devices that are pected This to provide a uniform and well-distributed daylight inexpected interior to spaces provide a uniform and well-distributed daylight illumination in interior spaces [12,37,40,51,57]
This study focuses on optimising internal, horizontal shading devices on the four façade orientations of a high-rise office building in a tropical city, with respect to the annual daylight metrics, through computational modelling and simulation
By focusing on this type of shading device, this study aims to validate the impact of the shading device on the annual daylight inside a building annually and reveal the factors that may affect its performance by doing a step-by-step optimisation to each room
Summary
Daylight through windows in office buildings is believed to yield positive impacts on the productivity of the employees [1,2,3]. It has been proposed that occupants’ productivity is correlated with their motivation and satisfaction levels, which can be increased by maximizing daylight and visual access to the windows, revealing information, such as weather, time, surrounding activities, and nature dynamics [4,5]. It is well understood that daylight in buildings creates a connectivity between outdoor and indoor spaces, providing visual comfort to the occupants [3,5,6]. In non-tropical regions, during winter, daylight penetration, direct sunlight penetration, may increase heat gain in buildings via radiation
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