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Development of architectural natural daylight lens using non-imaging optical method

Research Project

Project/Area Number 17K18916
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Research Field Architecture, Building engineering, and related fields
Research InstitutionTohoku University

Principal Investigator

Kobayashi Hikaru  東北大学, 工学研究科, 准教授 (90709734)

Project Period (FY) 2017-06-30 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Keywords採光装置 / 非結像工学 / 透明ルーバー / 自然採光 / 採光レンズ / 非結像光学 / 省エネルギー / 環境設計
Outline of Final Research Achievements

In this research, we developed a transparent stational daylighting louver installed on the window. In order to respond to a solar trajectory with a stational louver, the cross-section was designed using a non-imaging optic method, and it is possible to illuminate indoors by refraction and total reflection. By using a transparent body as the daylighting louver, we have realized a device that is more compact and easier to maintain than the louver with a curved metal mirror. The daylighting performance of the louver was confirmed by experiments using test pieces using clear acrylic resin and optical simulation. The daylighting device distributes sunlight to the ceiling and reflects the light from the ceiling to illuminate the desk surface. Even at noon in the summer when the solar altitude is high, and it is difficult to take daylight, an illuminance of several hundred lux is expected at a depth of 8m.

Academic Significance and Societal Importance of the Research Achievements

地球温暖化問題を背景とした建築物における省エネルギーの推進は急務であり、建築物に適用可能な自然エネルギー利用技術が求められている。太陽光は全ての建物で得られる自然エネルギーであり、昼光照明は昼間の照明用電力を軽減するとともに、快適性や知的生産性の向上に寄与することが期待できる。また、自然採光によって災害時などに最低限の照度を建築空間に確保するなどの目的にも利用できる。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (6 results)

All 2020 2019 2018

All Journal Article (2 results) (of which Peer Reviewed: 2 results) Presentation (4 results)

  • [Journal Article] DEVELOPMENT OF TRANSPARENT NONIMAGING DAYLIGHTING DEVICE USING REFRACTION AND TOTAL REFLECTION2018

    • Author(s)
      KONTA Marina、KOBAYASHI Hikaru
    • Journal Title

      Journal of Environmental Engineering (Transactions of AIJ)

      Volume: 83 Issue: 747 Pages: 435-441

    • DOI

      10.3130/aije.83.435

    • NAID

      130007378210

    • ISSN
      1348-0685, 1881-817X
    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] 透明材料による屈折と全反射を用いた固定型採光装置の開発2018

    • Author(s)
      今田 茉莉奈,小林 光
    • Journal Title

      日本建築学会環境系論文集

      Volume: 83

    • NAID

      130007378210

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] 非結像光学を用いた固定型透明採光ルーバーの開発に関する研究 (その2)光のロスを考慮したルーバーの改良2020

    • Author(s)
      川岸岳大、小林光、荒田啓輔
    • Organizer
      日本建築学会学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 非結像光学を用いた固定型透明採光ルーバーの開発に関する研究2019

    • Author(s)
      荒田啓輔、小林光
    • Organizer
      日本建築学会東北支部研究報告会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 非結像光学を用いた固定型透明採光ルーバーの開発に関する研究2019

    • Author(s)
      荒田啓輔、小林光
    • Organizer
      日本建築学会学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 非結像光学を用いた固定型透明採光ルーバーの開発に関する研究2019

    • Author(s)
      荒田啓輔,小林光
    • Organizer
      日本建築学会年次大会
    • Related Report
      2018 Research-status Report

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Published: 2017-07-21   Modified: 2021-02-19  

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