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

Author

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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)

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.

Suggested Citation

  • Heangwoo Lee & Janghoo Seo & Chang-ho Choi, 2019. "Preliminary Study on the Performance Evaluation of a Light Shelf Based on Reflector Curvature," Energies, MDPI, vol. 12(22), pages 1-20, November.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:22:p:4295-:d:285832
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    References listed on IDEAS

    as
    1. Heangwoo Lee & Janghoo Seo, 2018. "Development of Window-Mounted Air Cap Roller Module," Energies, MDPI, vol. 11(7), pages 1-14, July.
    2. Nikolaos Kampelis & Nikolaos Sifakis & Dionysia Kolokotsa & Konstantinos Gobakis & Konstantinos Kalaitzakis & Daniela Isidori & Cristina Cristalli, 2019. "HVAC Optimization Genetic Algorithm for Industrial Near-Zero-Energy Building Demand Response," Energies, MDPI, vol. 12(11), pages 1-23, June.
    3. Heangwoo Lee & Chang-ho Choi & Minki Sung, 2018. "Development of a Dimming Lighting Control System Using General Illumination and Location-Awareness Technology," Energies, MDPI, vol. 11(11), pages 1-19, November.
    4. Won Jun Choi & Hong Jin Joo & Jae-Wan Park & Sang-kyun Kim & Jae-Bum Lee, 2019. "Power Generation Performance of Building-Integrated Photovoltaic Systems in a Zero Energy Building," Energies, MDPI, vol. 12(13), pages 1-18, June.
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    Cited by:

    1. Heangwoo Lee & Janghoo Seo, 2020. "Performance Evaluation of External Light Shelves by Applying a Prism Sheet," Energies, MDPI, vol. 13(18), pages 1-14, September.
    2. Heangwoo Lee, 2020. "A Basic Study on the Performance Evaluation of a Movable Light Shelf with a Rolling Reflector That Can Change Reflectivity to Improve the Visual Environment," IJERPH, MDPI, vol. 17(22), pages 1-19, November.

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