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Proceedings Paper

Simulating the energy performance of holographic glazings
Author(s): K. Papamichael; L. Beltran; Reto Furler; E. S. Lee; Steven E. Selkowitz; Michael Rubin
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Paper Abstract

The light diffraction properties of holographic diffractive structures present an opportunity to improve the daylight performance in side-lit office spaces by redirecting and reflecting sunlight off the ceiling, providing adequate daylight illumination up to 30 ft (9.14 m) from the window wall. Prior studies of prototypical holographic glazings, installed above conventional `view' windows, have shown increased daylight levels over a deeper perimeter area than clear glass, for selected sun positions. In this study, we report on the simulation of the energy performance of prototypical holographic glazings assuming a commercial office building in the inland Los Angeles climate. The simulation of the energy performance involved determination of both luminous and thermal performance. Since the optical complexity of holographic glazings prevented the use of conventional algorithms for the simulation of their luminous performance, we used a newly developed method that combines experimentally determined directional workplane illuminance coefficients with computer-based analytical routines to determine a comprehensive set of daylight factors for many sun positions. These daylight factors were then used within the DOE-2.1D energy simulation program to determine hourly daylight and energy performance over the course of an entire year for four window orientations. Since the prototypical holographic diffractive structures considered in this study were applied on single pane clear glass, we also simulated the performance of hypothetical glazings, assuming the daylight performance of the prototype holographic glazings and the thermal performance of double-pane and low-e glazings. Finally, we addressed various design and implementation issues towards potential performance improvement.

Paper Details

Date Published: 9 September 1994
PDF: 9 pages
Proc. SPIE 2255, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII, (9 September 1994); doi: 10.1117/12.185418
Show Author Affiliations
K. Papamichael, Lawrence Berkeley Lab. (United States)
L. Beltran, Lawrence Berkeley Lab. (United States)
Reto Furler, Lawrence Berkeley Lab. (United States)
E. S. Lee, Lawrence Berkeley Lab. (United States)
Steven E. Selkowitz, Lawrence Berkeley Lab. (United States)
Michael Rubin, Lawrence Berkeley Lab. (United States)

Published in SPIE Proceedings Vol. 2255:
Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII
Volker Wittwer; Claes G. Granqvist; Carl M. Lampert, Editor(s)

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