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

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

TitleSplit-pane electrochromic window control based on an embedded photometric device with real-time daylighting computing
Publication TypeJournal Article
Year of Publication2019
AuthorsYujie Wu, Taoning Wang, Eleanor S Lee, Jérôme H Kämpf, Jean-Louis Scartezzini
JournalBuilding and Environment
Volume161
Pagination106229
Date Published08/2019
ISSN03601323
Keywordsdaylighting, electrochromic, Embedded Controller, HDR, windows
Abstract

Well-designed electrochromic (EC) glazing control can improve the energy performance of buildings and visual comfort of occupants in highly glazed buildings. This paper 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. 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 (WPI∈[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.

URLhttps://linkinghub.elsevier.com/retrieve/pii/S0360132319304391
DOI10.1016/j.buildenv.2019.106229
LBNL Report Number

LBNL-2001231

Short TitleBuilding and Environment