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Enhancing the performance of a passive tubular daylighting device using a parabolic-profile collector.

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Title: Enhancing the performance of a passive tubular daylighting device using a parabolic-profile collector.
Authors: Bisht PhD, DS1,2 (AUTHOR) devendrab44@gmail.com, Garg PhD, H1,2 (AUTHOR), Shravana Kumar ME, RR1,2 (AUTHOR), Karar PhD, V1,2 (AUTHOR)
Source: Lighting Research & Technology. Jun2020, Vol. 52 Issue 4, p495-523. 29p. 15 Diagrams, 13 Charts, 13 Graphs.
Subjects: Daylight, Summer solstice, Sunshine, Numerical analysis, Altitudes
Abstract: With the rise of renewable energy systems, there is an increased demand for improved designs of daylighting devices that work without any external energy source to illuminate the deep dark spaces of buildings. Most of the present designs deliver only low light levels especially during the early morning and late evening. This paper focuses on the performance evaluation of specifically designed parabolic-profile collector that redirects the low altitude incident rays of the sun efficiently into a mirror light pipe and thus enhances the lighting to desired levels in the building. Numerical analyses of the same were carried out for the summer solstice, winter solstice, and the autumn equinox for clear sky conditions. Experimental results for the proposed design validated the enhancement in light levels during low altitude sun and controlled lighting during the mid-day sun. The average lighting value obtained through the configured collector during low altitude sun was more than twice the lighting value achieved by a conventional daylight-collecting dome and was ∼20% higher than a prismatic collector. [ABSTRACT FROM AUTHOR]
Copyright of Lighting Research & Technology is the property of Sage Publications, Ltd. 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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  Availability: 0
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DbLabel: Engineering Source
An: 143719043
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Enhancing the performance of a passive tubular daylighting device using a parabolic-profile collector.
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  Data: <searchLink fieldCode="AR" term="%22Bisht+PhD%2C+DS%22">Bisht PhD, DS</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> devendrab44@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Garg+PhD%2C+H%22">Garg PhD, H</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Shravana+Kumar+ME%2C+RR%22">Shravana Kumar ME, RR</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Karar+PhD%2C+V%22">Karar PhD, V</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Lighting+Research+%26+Technology%22">Lighting Research & Technology</searchLink>. Jun2020, Vol. 52 Issue 4, p495-523. 29p. 15 Diagrams, 13 Charts, 13 Graphs.
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  Data: <searchLink fieldCode="DE" term="%22Daylight%22">Daylight</searchLink><br /><searchLink fieldCode="DE" term="%22Summer+solstice%22">Summer solstice</searchLink><br /><searchLink fieldCode="DE" term="%22Sunshine%22">Sunshine</searchLink><br /><searchLink fieldCode="DE" term="%22Numerical+analysis%22">Numerical analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Altitudes%22">Altitudes</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: With the rise of renewable energy systems, there is an increased demand for improved designs of daylighting devices that work without any external energy source to illuminate the deep dark spaces of buildings. Most of the present designs deliver only low light levels especially during the early morning and late evening. This paper focuses on the performance evaluation of specifically designed parabolic-profile collector that redirects the low altitude incident rays of the sun efficiently into a mirror light pipe and thus enhances the lighting to desired levels in the building. Numerical analyses of the same were carried out for the summer solstice, winter solstice, and the autumn equinox for clear sky conditions. Experimental results for the proposed design validated the enhancement in light levels during low altitude sun and controlled lighting during the mid-day sun. The average lighting value obtained through the configured collector during low altitude sun was more than twice the lighting value achieved by a conventional daylight-collecting dome and was ∼20% higher than a prismatic collector. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Lighting Research & Technology is the property of Sage Publications, Ltd. 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.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=143719043
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        Value: 10.1177/1477153519872794
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      – Code: eng
        Text: English
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        PageCount: 29
        StartPage: 495
    Subjects:
      – SubjectFull: Daylight
        Type: general
      – SubjectFull: Summer solstice
        Type: general
      – SubjectFull: Sunshine
        Type: general
      – SubjectFull: Numerical analysis
        Type: general
      – SubjectFull: Altitudes
        Type: general
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      – TitleFull: Enhancing the performance of a passive tubular daylighting device using a parabolic-profile collector.
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            – D: 01
              M: 06
              Text: Jun2020
              Type: published
              Y: 2020
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