The energy performance of prototype holographic glazings
We report on the simulation of the energy performance of prototype holographic glazings in commercial office buildings in a California climate. These prototype glazings, installed above conventional side windows, are designed to diffract the transmitted solar radiation and reflect it off the ceiling, providing adequate daylight illumination for typical office tasks up to 10m from the window. In this study, we experimentally determined a comprehensive set of solar-optical properties and characterized the contribution of the prototype holographic glazings to workplane illuminance in a scale model of a typical office space. We then used the scale model measurements to simulate the energy performance of the holographic glazings over the course of an entire year for four window orientations (North, East, South and West) for the inland Los Angeles climate, using the DOE-2.lD building energy analysis computer program. The results of our experimental analyses indicate that these prototype holographic glazings diffract only a small fraction of the incident light. The results of this study indicate that these prototype holographic glazings will not save energy in commercial office buildings. Their performance is very similar to that of clear glass, which, through side windows, cannot efficiently illuminate more than a 4m - 6m depth of a building`s perimeter, because the cooling penalties due to solar heat gain are greater than the electric lighting savings due to daylighting.
- Research Organization:
- Lawrence Berkeley Lab., CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 10182243
- Report Number(s):
- LBL--34367; ON: DE93040451; IN: DA-302
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
320107
99 GENERAL AND MISCELLANEOUS
990200
BUILDING SYSTEMS
CALIFORNIA
COMMERCIAL BUILDINGS
COMPUTERIZED SIMULATION
DAYLIGHTING
DIFFRACTION
ENERGY ANALYSIS
ENERGY EFFICIENCY
GLAZING
HOLOGRAPHY
ILLUMINANCE
MATHEMATICS AND COMPUTERS
OFFICE BUILDINGS
ORIENTATION
SEASONAL VARIATIONS
WINDOWS