Preliminary Study on the Performance Evaluation of a Light Shelf Based on Reflector Curvature

Heangwoo Lee, Janghoo Seo and Chang-ho Choi
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Heangwoo Lee: College of Design, Sangmyung University, Cheonan-si, Chungcheongnam-do 31066, Korea
Janghoo Seo: School of Architecture, Kookmin University, Seoul 02707, Korea
Chang-ho Choi: Department of Architectural Engineering, Kwangwoon University, Seoul 01886, Korea

Energies, 2019, vol. 12, issue 22, 1-20

Abstract: The consumption of lighting energy in buildings continues to rise, and many studies are being conducted to address this problem. As part of such initiatives, research is being performed on light shelves, which are natural lighting systems. However, most prior studies focused on variables for operating flat reflectors and light shelves. This study aims to evaluate the performance of curved light shelves to prove their effectiveness and derive optimal specifications for them. The following conclusions were reached. The optimal light shelf angles for a flat light shelf were found to be 30°, 20°, and 20° for the summer, mid-season, and winter, respectively, and accordingly, a movable light shelf system would be suitable for all three seasons. The optimal light shelf angles for a movable curved light shelf with an arc angle of 60° were found to be 30°, 30°, and 10° for the summer, mid-season, and winter, respectively. The optimal light shelf angle and arc angle for a fixed-type curved light shelf were found to be 20° and 60°, respectively. A fixed-type curved light shelf designed according to these optimal specifications can reduce energy consumption by 3.6% in comparison to a movable flat light shelf. Consequently, the curved light shelf is considered an effective system, and additional studies analyzing various other factors should be carried out in the future.

Keywords: light shelf; curvature; performance evaluation; energy saving (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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