Advanced optical daylighting systems: light shelves and light pipes

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Description

We present two perimeter daylighting systems that passively redirect beam sunlight further from the window wall using special optical films, an optimized geometry, and a small glazing aperture. The objectives of these systems are (1) to increase daylight illuminance levels at 4.6-9.1 m (15-30 ft) from the window aperture with minimum solar heat gains and (2) to improve the uniformity of the daylighting luminance gradient across the room under variable solar conditions throughout the year. The designs were developed through a series of computer-assisted ray-tracing studies, laser visualization techniques, and photometric measurements and observations using physical scale models. Bi-directional illuminance ... continued below

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33 p.

Creation Information

Beltran, L. O.; Lee, E. S. & Selkowitz, S. E. May 1996.

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Description

We present two perimeter daylighting systems that passively redirect beam sunlight further from the window wall using special optical films, an optimized geometry, and a small glazing aperture. The objectives of these systems are (1) to increase daylight illuminance levels at 4.6-9.1 m (15-30 ft) from the window aperture with minimum solar heat gains and (2) to improve the uniformity of the daylighting luminance gradient across the room under variable solar conditions throughout the year. The designs were developed through a series of computer-assisted ray-tracing studies, laser visualization techniques, and photometric measurements and observations using physical scale models. Bi-directional illuminance measurements in combination with analytical routines were then used to simulate daylight performance for any solar position, and were incorporated into the DOE-2.1E building energy analysis computer program to evaluate energy savings. Results show increased daylight levels and an improved luminance gradient throughout the year compared to conventional daylighting systems.

Physical Description

33 p.

Notes

OSTI as DE97000922

Source

  • 1996 IESNA annual conference, Cleveland, OH (United States), 4-7 Aug 1996

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  • Other: DE97000922
  • Report No.: LBL--38133
  • Report No.: CONF-9608158--2
  • Grant Number: AC03-76SF00098
  • DOI: 10.2172/406122 | External Link
  • Office of Scientific & Technical Information Report Number: 406122
  • Archival Resource Key: ark:/67531/metadc682657

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • May 1996

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  • July 25, 2015, 2:20 a.m.

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  • Nov. 12, 2015, 6:18 p.m.

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Beltran, L. O.; Lee, E. S. & Selkowitz, S. E. Advanced optical daylighting systems: light shelves and light pipes, report, May 1996; California. (digital.library.unt.edu/ark:/67531/metadc682657/: accessed October 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.