Design Optimisation of Fixed and Adaptive Shading Devices on Four Façade Orientations of a High-Rise Office Building in the Tropics

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.

Daylighting design validation and optimisation of tropical school classrooms with asymmetrical bilateral opening typology

“…Thus, glare control strategies such as installing blinds or internal shading devices are also worth considering, as suggested in the literature. 55 The findings of this study also indicated that, in the case of tropical school classrooms with asymmetrical bilateral opening typologies, one may consider only one of the building orientations with the greatest objective function Y. In the Indonesian context, based on the findings, the greatest Y was achieved with an orientation of 180°, that is, when the front or entrance side faces the west.…”

“…Thus, glare control strategies such as installing blinds or internal shading devices are also worth considering, as suggested in the literature. 55…”

A multi‐objective optimization approach to designing window and shading systems considering building energy consumption and occupant comfort

“…On the other hand, in Iran, optimizing the window orientation, the WWR, and the shading specifications increased UDI by up to 70% while reducing energy use by 59% 50 . The result of an internal adaptive shading study in a high‐rise building in a tropical climate was a satisfying performance with sDA 300/50% ≥ 74% and ASE 1000,250 ≤ 12% 51 . Based on the study of optimal shading in Algeria, the WWR was increased from 20% to 40% for the southern window and 30% to 50% for the eastern and western windows using a multi‐objective algorithm via the Octopus plug‐in for Grasshopper 52 …”

“…50 The result of an internal adaptive shading study in a high-rise building in a tropical climate was a satisfying performance with sDA 300/50% ≥ 74% and ASE 1000,250 ≤ 12%. 51 Based on the study of optimal shading in Algeria, the WWR was increased from 20% to 40% for the southern window and 30% to 50% for the eastern and western windows using a multi-objective algorithm via the Octopus plug-in for Grasshopper. 52 By utilizing more advanced technologies, such as machine learning algorithms for automated shading, which are fed by real-time solar irradiance and sun position, 86.5% to 96.9% of glare was prevented, and an 80.8% reduction in lighting energy consumption was achieved; in contrast, in the case of cut-off angle control, these reductions were limited to 28.9% and 67.6%, respectively.…”

Algorithmic Generation of Building Typology for Office Building Design

“…Some studies deal with the effects of the geometry of external horizontal fixed shading on internal air temperature, daylight, and energy demand [15]. Also found were optimization process presentation of parametrically controlled shading geometries [16] and comparative analysis of shading with fixed and adaptive shading solutions [17].…”