Evaluation of External Light Shelf Performance in Relation to the Ceiling Types Used in Indoor Spaces.
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| Title: | Evaluation of External Light Shelf Performance in Relation to the Ceiling Types Used in Indoor Spaces. |
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| Authors: | Jung, Su-yeon1 (AUTHOR) s201920289@gmail.com, Lee, Min-Goo2 (AUTHOR) emingoo@keti.re.kr, Lee, Heangwoo1 (AUTHOR) 2hw@smu.ac.kr |
| Source: | Energies (19961073). Dec2023, Vol. 16 Issue 24, p8107. 18p. |
| Subjects: | Ceilings, Natural ventilation, Daylight, Luminous flux |
| Abstract: | A light shelf is a type of natural daylight system that brings natural light from the outside into an indoor space through a reflector and a ceiling surface. The introduction of light shelves has led to studies evaluating their efficiency. However, past studies on light shelves did not consider the diversity of ceiling types when evaluating their performance. Therefore, this study derives fundamental data involving external light shelf designs by evaluating light shelf performance based on the ceiling type present using a light environment simulation method. This study analyzed the indoor illuminance distribution with Radiance to evaluate the performance according to light shelves and indoor space types. The results derived from this study are as follows: (1) In the case of a flat ceiling, the performance of an external light shelf can be improved by increasing its angle and width. However, adjusting the external light shelf angle to 30° during the middle of the season and 20° in winter is ineffective because natural light is not reflected by the ceiling surface. (2) The performance of a light shelf can be improved by increasing the slope and curvature of the ceiling types specified in this study. However, setting the light shelf angle to 30° during the middle season and to 30° and 20° in winter, when external natural light entering the indoor space is not reflected by the ceiling surface, is ineffective due to the low levels of daylight performance, regardless of the type of space. (3) To increase uniformity levels in gable ceilings and curved ceilings, it is advantageous to increase the number of reflections and diffusion areas on the ceiling's surface due to the uniqueness of these ceiling shapes. Furthermore, the optimal external light shelf angle for these ceiling types differs from that of other types. (4) Regarding the appropriate external light shelf size according to a particular ceiling type, installing an angle-controllable external light shelf with a width of 1.2 m can improve daylight performance. [ABSTRACT FROM AUTHOR] |
| Copyright of Energies (19961073) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Header | DbId: egs DbLabel: Engineering Source An: 174437686 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Evaluation of External Light Shelf Performance in Relation to the Ceiling Types Used in Indoor Spaces. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Jung%2C+Su-yeon%22">Jung, Su-yeon</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> s201920289@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Lee%2C+Min-Goo%22">Lee, Min-Goo</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> emingoo@keti.re.kr</i><br /><searchLink fieldCode="AR" term="%22Lee%2C+Heangwoo%22">Lee, Heangwoo</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> 2hw@smu.ac.kr</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Energies+%2819961073%29%22">Energies (19961073)</searchLink>. Dec2023, Vol. 16 Issue 24, p8107. 18p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Ceilings%22">Ceilings</searchLink><br /><searchLink fieldCode="DE" term="%22Natural+ventilation%22">Natural ventilation</searchLink><br /><searchLink fieldCode="DE" term="%22Daylight%22">Daylight</searchLink><br /><searchLink fieldCode="DE" term="%22Luminous+flux%22">Luminous flux</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: A light shelf is a type of natural daylight system that brings natural light from the outside into an indoor space through a reflector and a ceiling surface. The introduction of light shelves has led to studies evaluating their efficiency. However, past studies on light shelves did not consider the diversity of ceiling types when evaluating their performance. Therefore, this study derives fundamental data involving external light shelf designs by evaluating light shelf performance based on the ceiling type present using a light environment simulation method. This study analyzed the indoor illuminance distribution with Radiance to evaluate the performance according to light shelves and indoor space types. The results derived from this study are as follows: (1) In the case of a flat ceiling, the performance of an external light shelf can be improved by increasing its angle and width. However, adjusting the external light shelf angle to 30° during the middle of the season and 20° in winter is ineffective because natural light is not reflected by the ceiling surface. (2) The performance of a light shelf can be improved by increasing the slope and curvature of the ceiling types specified in this study. However, setting the light shelf angle to 30° during the middle season and to 30° and 20° in winter, when external natural light entering the indoor space is not reflected by the ceiling surface, is ineffective due to the low levels of daylight performance, regardless of the type of space. (3) To increase uniformity levels in gable ceilings and curved ceilings, it is advantageous to increase the number of reflections and diffusion areas on the ceiling's surface due to the uniqueness of these ceiling shapes. Furthermore, the optimal external light shelf angle for these ceiling types differs from that of other types. (4) Regarding the appropriate external light shelf size according to a particular ceiling type, installing an angle-controllable external light shelf with a width of 1.2 m can improve daylight performance. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Energies (19961073) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.3390/en16248107 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 18 StartPage: 8107 Subjects: – SubjectFull: Ceilings Type: general – SubjectFull: Natural ventilation Type: general – SubjectFull: Daylight Type: general – SubjectFull: Luminous flux Type: general Titles: – TitleFull: Evaluation of External Light Shelf Performance in Relation to the Ceiling Types Used in Indoor Spaces. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Jung, Su-yeon – PersonEntity: Name: NameFull: Lee, Min-Goo – PersonEntity: Name: NameFull: Lee, Heangwoo IsPartOfRelationships: – BibEntity: Dates: – D: 15 M: 12 Text: Dec2023 Type: published Y: 2023 Identifiers: – Type: issn-print Value: 19961073 Numbering: – Type: volume Value: 16 – Type: issue Value: 24 Titles: – TitleFull: Energies (19961073) Type: main |
| ResultId | 1 |
