Performance evaluation of a light shelf with a solar module based on the solar module attachment area

Lee, Heangwoo

doi:10.1016/j.buildenv.2019.106161

Cited by 21 publications

(24 citation statements)

References 27 publications

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“…This demonstrates the improvement of daylighting performance and the effectiveness of applying a prism sheet. Previous studies of light shelves [11][12][13][14][15][16][18][19][20] mentioned the need for movable light shelves to improve daylighting performance and save lighting energy; however, this study produced valid results in improving daylighting performance without operating or moving the light shelf.…”

Section: Discussionmentioning

confidence: 73%

“…Energies 2020, 13, x FOR PEER REVIEW 2 of 14 and the surface of the ceiling. Various studies have confirmed the effectiveness of light shelves [11][12][13]. However, conventional light shelves use flat reflectors to introduce external natural light into rooms [14], so the daylighting performance of the light shelf may be reduced depending on external environmental factors, such as the altitude of the sun.…”

Section: Concept Of a Light Shelf And Summary Of Previous Studiesmentioning

confidence: 99%

“…Light shelves are classified into external and internal light shelves depending on the installation location [14]; external light shelves have better daylighting performance than internal light shelves [18], however, there are issues related to damage and maintenance since they are installed on the outside [17]. As shown in Table 1, recent studies related to light shelves [11][12][13][14][15][16][18][19][20][21] have applied advanced technologies such as user recognition and location recognition or have incorporated daylighting and shading systems to improve the daylighting performance. Although the light shelves proposed in and the surface of the ceiling.…”

Section: Concept Of a Light Shelf And Summary Of Previous Studiesmentioning

confidence: 99%

“…As shown in Table 1, recent studies related to light shelves [11][12][13][14][15][16][18][19][20][21] have applied advanced technologies such as user recognition and location recognition or have incorporated daylighting and shading systems to improve the daylighting performance. Although the light shelves proposed in Energies 2020, 13, 4618 3 of 13 these studies may contribute to saving lighting energy by maximizing the daylighting performance, they require complex structures or increase the range of motion and therefore have lower economic efficiency than simple conventional light shelves.…”

Section: Concept Of a Light Shelf And Summary Of Previous Studiesmentioning

confidence: 99%

“…A light shelf is a typical natural daylighting system that introduces external natural light deep into rooms by using the reflector of the light shelf and the surface of the ceiling. Various studies have confirmed the effectiveness of light shelves [11][12][13]. However,…”

Section: Introductionmentioning

confidence: 99%

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Performance Evaluation of External Light Shelves by Applying a Prism Sheet

Lee

Seo

2020

Energies

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To address the increased use of lighting energy in the building sector, research on the use of light shelves has been increasing. Previous studies have focused on applying operating techniques to improve daylighting performance, which reduces the economic efficiency of light shelves and the building energy savings. This study proposes the use of prism sheets to improve the performance of light shelves, a concept which was validated by evaluating the performance related to saving building energy and improving indoor light uniformity through a full-scale testbed. This study used an external light shelf with no prism sheet, a window with a prism sheet applied, and a window with both an external light shelf and prism sheet applied as Case 1, Case 2, and Case 3, respectively, and analyzed the illuminance distribution and lighting energy consumption required to maintain the optimal indoor illumination for each case. This study also derived the optimal specifications for each case to save building energy and considered the flow of natural light to analyze the performance evaluation results. The main findings are as follows: (1) the optimal specifications to improve daylighting performance were derived for Case 1, requiring the application of operating techniques; (2) Case 2 was not suitable for saving energy and improving light uniformity when compared to Case 1; and (3) Case 3 was effective in saving building energy. In Case 3, even when the light shelf was fixed at 20° without moving, it saved building energy and improved light uniformity compared to Case 1. However, the prism sheet in Case 3 should be detached during winter to maximize building energy savings.

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