Advanced parametric louver systems with bi-axis and two-layer designs for an extensive daylighting coverage in a deep-plan office room

Abstract

Advanced daylighting systems have become commonly used in modern architecture for a more sustainable environment. The mainstream of recent daylighting studies focuses not only on the quantity but also the quality of daylight delivered to an interior space. The more uniform daylight is distributed in the required illuminance range, the more light stability is achieved, and the longer time is illuminated by daylight, the more electrical lighting energy can be potentially saved.This study proposes an advanced daylighting design based on a parametrically controlled louver with reflective slats to redirect sunlight onto a ceiling, which can then serve as a source of diffuse light to illuminate a room. The design aims to achieve steadier and more uniform daylight distribution during the working hours in a deep-plan office room. The angle of each slat of the louver is parametrically controlled to target a corresponding area on the ceiling. In order to achieve a steadier daylighting, a bi-axis design and a two-layer design with a shifted target are evaluated and compared with a one-axis design. A daylighting analysis of the proposed design is exemplified for a south-oriented 8m deep office room in a hot arid territory. The daylight analysis was performed using Grasshopper software as a parametric tool to link with Radiance and DAYSIM daylighting analysis. The proposed design shows promising merit that it can provide a relatively steady and *Unmarked Revised Manuscript For Publication Click here to view linked References distributed daylight coverage for more than 90% of the floor area within the recommended acceptable range 300~500 lux during the working hours.

An automated louver with innovative parametrically-angled reflective slats: Prototyping and validation via using parametric control in Grasshopper along with Arduino board

“…Recently, the parametric design has been utilized to provide better control, more accuracy and solve complex relations simultaneously [85]. As a parametric control method, Grasshopper was particularly utilised in previous studies to adjust the direction of mirrored surfaces for better daylight distribution inside the room [6,102,103]. For example, a study investigated the rotation control of a reflective lightshelf according to the sunlight incident angle to improve daylighting performance in an office room in New York [90].…”

Design Optimization of Hyperboloid Wooden House Concerning Structural, Cost, and Daylight Performance

“…Figure 14 shows the 3D scatter plot that plots the design solution from the daylight objective iteration in optimization two. The objectives were to measure the useful daylight illumination (UDI) ranged between 300 lux and 500 lux [52,53] during designated days in summer and winter. In addition, the geometry objective, which was a glazing area to ensure the view quality to the outside, was also incorporated.…”

“…UDI is defined as the annual occurrence of daylight illuminances across the work plane where the illuminances are within the range of 100 lux-2000 lux and are within a range considered "useful" by occupants [50,51]. However, this research only calculated the area with UDI ranged from 300 lux to 500 lux as it was developed and adopted in [52,53]. The metric used to measure the daylight was called useful daylight illuminance (UDI).…”

Louver and window position effect on cross-ventilation in a generic isolated building: A CFD approach

“…Numerous studies have been performed to analyze various aspects of louvers. 7,24,[32][33][34][35][36][37][38][39] Some of them focused on the use of louvers as shading devices to control daylight 39 and heat gain, 37 on the increasing natural airflow in the double-glazed façades, 38 and on the performance of the windcatcher. 7 Liu et al 7 carried out CFD simulations to evaluate the effect of the length and the number of layers of louvers in the inlet, on the performance of the wind-catcher.…”