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Title: Split-pane electrochromic window control based on an embedded photometric device with real-time daylighting computing

Journal Article · · Building and Environment
ORCiD logo [1];  [2];  [2]; ORCiD logo [3];  [1]
  1. École Polytechnique fédérale de Lausanne (EPFL), Lausanne (Switzerland)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Idiap Research Institute, Martigny (Switzerland)
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Well-designed electrochromic (EC) glazing control can improve the energy performance of buildings and visual comfort of occupants in highly glazed buildings. Here in this paper, we designed and demonstrated a compact integrated EC glazing automation system to control tint states of a split-pane EC window according to variations of sky conditions. The control is based on monitoring the luminance distribution of the sky and real-time lighting computation for a building interior, using an embedded photometric device (EPD). It optimizes tint states of EC glazing to offer sufficient daylight provision and temper discomfort glare for occupants, which potentially mitigates excessive solar heat gain. ’In-situ’ experiments were conducted in a full-scale testbed to demonstrate the daylighting performance under various sky conditions. Finally, experimental results showed 83% of the working time for work-plane illuminance (WPI) and 95% of the time for daylight glare probability (DGP) were constrained in comfort range (WPIϵ[500, 2000] lux, DGP ≤ 0.35) by the automated EC glazing (controlled by EPD) under clear skies; 68% of the time for WPI and 94% of the time for DGP in confined range under clear skies with thin clouds; 62% of the time for WPI and 85% of the time for DGP in confined range under partly cloudy skies.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Building Technologies Office
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1559240
Alternate ID(s):
OSTI ID: 1531189
Journal Information:
Building and Environment, Vol. 161, Issue C; ISSN 0360-1323
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 4 works
Citation information provided by
Web of Science

Figures / Tables (16)

Fig. 1(p. 6)figure Fig. 1
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Fig. 8(p. 15)figure Fig. 8
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Fig. 11(p. 17)figure Fig. 11
Fig. 12(p. 19)figure Fig. 12
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Fig. 14(p. 21)figure Fig. 14
Table 1(p. 23)table Table 1
Fig. 15(p. 24)figure Fig. 15

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Related Subjects

42 ENGINEERING
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
97 MATHEMATICS AND COMPUTING
Electrochromic window
Real-time lighting simulation
FPGA
Embedded photometric system
Visual comfort
HDR imaging