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

Eltaweel, Ahmad; Su, Yuehong; Lv, Qinghua; Lv, Hui

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


Authors

Ahmad Eltaweel

YUEHONG SU YUEHONG.SU@NOTTINGHAM.AC.UK
Professor of Thermal Science and Building Technology

Qinghua Lv

Hui Lv



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 8 m 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 distributed daylight coverage for more than 90% of the floor area within the recommended acceptable range 300–500 lx during the working hours.

Citation

Eltaweel, A., Su, Y., Lv, Q., & Lv, H. (2020). Advanced parametric louver systems with bi-axis and two-layer designs for an extensive daylighting coverage in a deep-plan office room. Solar Energy, 206, 596-613. https://doi.org/10.1016/j.solener.2020.06.035

Journal Article Type Article
Acceptance Date Jun 8, 2020
Online Publication Date Jun 22, 2020
Publication Date 2020-08
Deposit Date Jun 23, 2020
Publicly Available Date Mar 28, 2024
Journal Solar Energy
Print ISSN 0038-092X
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 206
Pages 596-613
DOI https://doi.org/10.1016/j.solener.2020.06.035
Keywords Renewable Energy, Sustainability and the Environment; General Materials Science
Public URL https://nottingham-repository.worktribe.com/output/4704476
Publisher URL https://www.sciencedirect.com/science/article/abs/pii/S0038092X20306502
Additional Information This article is maintained by: Elsevier; Article Title: Advanced parametric louver systems with bi-axis and two-layer designs for an extensive daylighting coverage in a deep-plan office room; Journal Title: Solar Energy; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.solener.2020.06.035; Content Type: article; Copyright: © 2020 International Solar Energy Society. Published by Elsevier Ltd. All rights reserved.