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Effective Daylighting Design Strategies for Energy Efficient Spaces

Learn about maximizing natural light in architecture with glazing, reflectors, and analysis methods for optimal daylighting factors and isolux contours. Explore various vertical and horizontal strategies and components like skylights and light shelves.

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Effective Daylighting Design Strategies for Energy Efficient Spaces

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  1. Environmental Controls I/IG Lecture 18 Daylighting Design & Analysis Design Strategies Glazing and Reflectors Sidelighting Analysis Method

  2. Daylighting Design & Analysis

  3. Orientation and Slope Vertical vs. HorizontalTime of year Sun position DL-5 F. 10-1 p. 79

  4. Daylighting Components SC=Sun + Sky IRC1 IRC2 ERC S: F.14.18 p. 590

  5. Daylighting Factor (DF) The quantity of interior illuminance on a horizontal work plane expressed as a percentage of illuminance of an exterior unobstructed horizontal plane DF (%) = (EINT/EEXT) x 100

  6. Daylighting Factor (DF) If EINT is 20 foot-candles and EEXT is 1000 foot-candles, then what is the daylighting factor? DF(%)= (EINT/EEXT) x 100 DF (%)=(20/1000) x 100 DF (%)=2.0%

  7. Isolux Contours • Lines of similar lighting levels • Expressed as DF Darwin College Library, Cambridge, England

  8. 1+ 2+ 3+ 4+ 5+ 6+ 7+ 8+ 9+ Isolux Contours Example EEXT= 2000 fc 1: 20 fc 2: 60 fc 3: 100 fc 4: 40 fc 5: 80 fc 6: 140 fc 7: 20 fc 8: 60 fc 9: 100 fc DF(%)= (EINT/EEXT) x 100

  9. 1+ 2+ 3+ 4+ 5+ 6+ 7+ 8+ 9+ Isolux Contours Example EEXT= 2000 fc 1: 20 fc DF=1 % 2: 60 fc DF=3 % 3: 100 fc DF=5 % 4: 40 fc DF=2 % 5: 80 fc DF=4 % 6: 140 fc DF=7 % 7: 20 fc DF=1 % 8: 60 fc DF=3 % 9: 100 fc DF=5 %

  10. 1 3 5 2 4 7 1 3 5 Isolux Contours Example EEXT= 2000 fc 1: 20 fc DF=1 % 2: 60 fc DF=3 % 3: 100 fc DF=5 % 4: 40 fc DF=2 % 5: 80 fc DF=4 % 6: 140 fc DF=7 % 7: 20 fc DF=1 % 8: 60 fc DF=3 % 9: 100 fc DF=5 % 6 4 2

  11. Isolux Contours • Lines of similar lighting levels • Expressed as DF Darwin College Library, Cambridge, England

  12. Illumination Gradient Ludwig Museum, Koln, Germany An illumination gradient through a section

  13. Design Strategies

  14. Selection Parameters Daylight availability Task orientation Space orientation

  15. Daylighting Graphs 10’ Ceiling 30” Work plane DL-5: F10-2 p. 80

  16. South Facing Walls Solid Overhang a: translucent glazing b: horizontal overhang c: 30º sloped clear glazing d: 45º sloped clear glazing DL-5: F10-5 p. 82

  17. South Facing Walls Diffusing Awnings a: translucent glazing b: translucent awning clear glazing c: white vertical slatted awning, clear glazing d: white, horizontal slatted awning, clear glazing DL-5: F10-6 p. 82

  18. Light Shelves W: With light shelf WO: Without light shelf DL-5: F10-18 p. 89

  19. Skylights Effect of skylight above roof a: flat horizontal b: half-round barrel, white opaque ends c: steeply sloped A-frame, white opaque ends Typographic Error In Reading DL-5: F10-21 p. 91

  20. Roof Monitors North-South Monitors a: translucent panel b: north monitor, clear glazing c: south monitor, translucent glazing DL-5: F10-30 p. 95

  21. Roof Monitors Sun Control Baffles/Louvers Light Wells DL-5: F10-35 p. 97

  22. Roof Monitors Graphic Design Approach DL-5: F10-37 p. 98

  23. Glazing & Reflectors

  24. Fenestration Window or Fenestration?

  25. Clear Glazing Maximum VLT DL-5: F11-1 p. 105

  26. Gray/Bronze Glazing Gray glass preferred where color rendition is important DL-5: F11-2 p. 106

  27. Heat Absorbing Glazing • Green is more common • Blue is becoming moreavailable DL-5: F11-3 p. 107

  28. Solar IR Reflective Film Low-E Glass DL-5: F 11-6 p. 109

  29. Multiple Glazing • Combinations of individual paned glazing • Mylar/Film layer • Inert gas (argon or krypton) • “Superwindow”

  30. Exotics • LED Windows • Aerogels • Kalwall Prototype House and Studio Thomas Herzog

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