Potential annual daylighting performance of a high-efficiency daylight redirecting slat system

Fernandes, Luís L.; Lee, Eleanor S.; Thanachareonkit, Anothai; Selkowitz, Stephen E.

doi:10.1007/s12273-020-0674-6

Potential annual daylighting performance of a high-efficiency daylight redirecting slat system

Journal Article · Sat Aug 15 00:00:00 EDT 2020 · Building Simulation

DOI:https://doi.org/10.1007/s12273-020-0674-6· OSTI ID:1676372

Fernandes, Luís L. ^[1]; Lee, Eleanor S. ^[1]; Thanachareonkit, Anothai ^[1]; Selkowitz, Stephen E. ^[1]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

While the primary role of window attachments is often to moderate glare and solar heat gains, they are also able to provide additional daylight to interior spaces. For this purpose, a variety of daylight-redirecting window systems have been developed over the past 150 years. Fixed reflective systems (slats/light shelves) or prismatic systems that rely on total internal reflection work well under specific solar conditions, but generally sacrifice performance over a much wider range of incident solar angles and sky conditions. Dynamic systems - typically reflective slats - are more responsive to sun angles but have not been able to achieve optimal performance for glare and daylight redirection efficiency. A previous investigation into an adjustable, reflective blind concept first conceived of in the late 1970s showed promise but was not reduced to practice due to lack of adequate simulation and analysis tools. In this paper, this concept is further developed and its energy and visual comfort performance evaluated for four mid-latitude, temperate climates using ray-tracing simulation techniques. Overall, results indicate significant potential lighting energy savings when compared with conventional automated reflective blinds (2.1–4.9 kWh/(m²·a), or 14%–42%, depending on climate and orientation) or, especially, manually-operated matte white venetian blinds (1.4–7.9 kWh/(m²·a), or 9%–54%, depending on climate and orientation), while maintaining acceptable or better visual comfort conditions throughout the interior space.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Building Technologies Office

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1676372

Journal Information:: Building Simulation, Journal Name: Building Simulation Journal Issue: 3 Vol. 14; ISSN 1996-3599

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
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