Measured daylighting potential of a static optical louver system under real sun and sky conditions
Abstract
Side-by-side comparisons were made over solstice-to-solstice changes in sun and sky conditions between an optical louver system (OLS) and a conventional Venetian blind set at a horizontal slat angle and located inboard of a south-facing, small-area, clerestory window in a full-scale office testbed. Daylight autonomy (DA), window luminance, and ceiling luminance uniformity were used to assess performance. The performance of both systems was found to have significant seasonal variation, where performance under clear sky conditions improved as maximum solar altitude angles transitioned from solstice to equinox. Although the OLS produced fewer hours per day of DA on average than the Venetian blind, the OLS never exceeded the designated 2000 cd/m2 threshold for window glare. In contrast, the Venetian blind was found to exceed the visual discomfort threshold over a large fraction of the day during equinox conditions. Notably, these peak periods of visual discomfort occurred during the best periods of daylighting performance. Luminance uniformity was analyzed using calibrated high dynamic range luminance images. Under clear sky conditions, the OLS was found to increase the luminance of the ceiling as well as produce a more uniform distribution. Furthermore, compared to conventional venetian blinds, the static optical sunlight redirecting system studied hasmore »
- Authors:
-
- Univ. of Southern California, Los Angeles, CA (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Building Technologies Office
- OSTI Identifier:
- 1248924
- Alternate Identifier(s):
- OSTI ID: 1253407
- Report Number(s):
- LBNL-187135
Journal ID: ISSN 0360-1323; ir:187135
- Grant/Contract Number:
- AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Building and Environment
- Additional Journal Information:
- Journal Volume: 92; Journal Issue: C; Journal ID: ISSN 0360-1323
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; daylighting; sunlight redirecting system; optical louver system; field measurements; high dynamic range luminance images
Citation Formats
Konis, Kyle, and Lee, Eleanor S. Measured daylighting potential of a static optical louver system under real sun and sky conditions. United States: N. p., 2015.
Web. doi:10.1016/j.buildenv.2015.04.024.
Konis, Kyle, & Lee, Eleanor S. Measured daylighting potential of a static optical louver system under real sun and sky conditions. United States. https://doi.org/10.1016/j.buildenv.2015.04.024
Konis, Kyle, and Lee, Eleanor S. Mon .
"Measured daylighting potential of a static optical louver system under real sun and sky conditions". United States. https://doi.org/10.1016/j.buildenv.2015.04.024. https://www.osti.gov/servlets/purl/1248924.
@article{osti_1248924,
title = {Measured daylighting potential of a static optical louver system under real sun and sky conditions},
author = {Konis, Kyle and Lee, Eleanor S.},
abstractNote = {Side-by-side comparisons were made over solstice-to-solstice changes in sun and sky conditions between an optical louver system (OLS) and a conventional Venetian blind set at a horizontal slat angle and located inboard of a south-facing, small-area, clerestory window in a full-scale office testbed. Daylight autonomy (DA), window luminance, and ceiling luminance uniformity were used to assess performance. The performance of both systems was found to have significant seasonal variation, where performance under clear sky conditions improved as maximum solar altitude angles transitioned from solstice to equinox. Although the OLS produced fewer hours per day of DA on average than the Venetian blind, the OLS never exceeded the designated 2000 cd/m2 threshold for window glare. In contrast, the Venetian blind was found to exceed the visual discomfort threshold over a large fraction of the day during equinox conditions. Notably, these peak periods of visual discomfort occurred during the best periods of daylighting performance. Luminance uniformity was analyzed using calibrated high dynamic range luminance images. Under clear sky conditions, the OLS was found to increase the luminance of the ceiling as well as produce a more uniform distribution. Furthermore, compared to conventional venetian blinds, the static optical sunlight redirecting system studied has the potential to significantly reduce the annual electrical lighting energy demand of a daylit space and improve the quality from the perspective of building occupants by consistently transmitting useful daylight while eliminating window glare.},
doi = {10.1016/j.buildenv.2015.04.024},
journal = {Building and Environment},
number = C,
volume = 92,
place = {United States},
year = {Mon May 04 00:00:00 EDT 2015},
month = {Mon May 04 00:00:00 EDT 2015}
}
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Works referenced in this record:
U.S. energy savings potential from dynamic daylighting control glazings
journal, November 2013
- Shehabi, Arman; DeForest, Nicholas; McNeil, Andrew
- Energy and Buildings, Vol. 66
Light shelves: Computer assessment of daylighting performance
journal, June 1995
- Littlefair, P. J.
- Lighting Research and Technology, Vol. 27, Issue 2
Anidolic daylighting systems
journal, August 2002
- Scartezzini, Jean-Louis; Courret, Gilles
- Solar Energy, Vol. 73, Issue 2
Development and validation of a Radiance model for a translucent panel
journal, July 2006
- Reinhart, Christoph F.; Andersen, Marilyne
- Energy and Buildings, Vol. 38, Issue 7
Empirical Assessment of a Prismatic Daylight-Redirecting Window Film in a Full-Scale Office Testbed
journal, October 2013
- Thanachareonkit, Anothai; Lee, Eleanor S.; McNeil, Andrew
- LEUKOS, Vol. 10, Issue 1
Simulating the Daylight Performance of Complex Fenestration Systems Using Bidirectional Scattering Distribution Functions within Radiance
journal, April 2011
- Ward, G.; Mistrick, R.; Lee, E. S.
- LEUKOS, Vol. 7, Issue 4
A validation of the Radiance three-phase simulation method for modelling annual daylight performance of optically complex fenestration systems
journal, January 2013
- McNeil, A.; Lee, E. S.
- Journal of Building Performance Simulation, Vol. 6, Issue 1
Sunshine duration and daily courses of illuminance in Bratislava
journal, January 2004
- Darula, Stanislav; Kittler, Richard
- International Journal of Climatology, Vol. 24, Issue 14
Lightswitch-2002: a model for manual and automated control of electric lighting and blinds
journal, January 2004
- Reinhart, Christoph F.
- Solar Energy, Vol. 77, Issue 1
Useful daylight illuminance: a new paradigm for assessing daylight in buildings
journal, March 2005
- Nabil, A.; Mardaljevic, J.
- Lighting Research & Technology, Vol. 37, Issue 1
Unified glare rating (UGR): Merits and application to multiple sources
journal, January 1998
- Einhom, H. D.
- Lighting Research and Technology, Vol. 30, Issue 2
Evaluation methods and development of a new glare prediction model for daylight environments with the use of CCD cameras
journal, July 2006
- Wienold, Jan; Christoffersen, Jens
- Energy and Buildings, Vol. 38, Issue 7
Works referencing / citing this record:
Feasibility Study and Impact of Daylight on Illumination Control for Energy-Saving Lighting Systems
journal, November 2018
- Bunjongjit, Sulee; Ngaopitakkul, Atthapol
- Sustainability, Vol. 10, Issue 11
Using integrated parametric control to achieve better daylighting uniformity in an office room: A multi-Step comparison study
journal, October 2017
- Eltaweel, Ahmad; Yuehong, Su
- Energy and Buildings, Vol. 152