Performance of Integrated Systems of Automated Roller Shade Systems and Daylight Responsive Dimming Systems

TitlePerformance of Integrated Systems of Automated Roller Shade Systems and Daylight Responsive Dimming Systems
Publication TypeJournal Article
Year of Publication2011
AuthorsByoung-Chul Park, An-Seop Choi, Jae-Weon Jeong, Eleanor S. Lee
JournalBuilding and Environment
Volume46
747
Issue3
Pagination747-757
Date Published03/2011
Keywordsautomated roller shade systems, daylight responsive dimming systems, daylighting, Integrated systems, photoelectric controls
Abstract

Daylight responsive dimming systems have been used in few buildings to date because they require improvements to improve reliability. The key underlying factor contributing to poor performance is the variability of the ratio of the photosensor signal to daylight workplane illuminance in accordance with sun position, sky condition, and fenestration condition. Therefore, this paper describes the integrated systems between automated roller shade systems and daylight responsive dimming systems with an improved closed-loop proportional control algorithm, and the relative performance of the integrated systems and single systems. The concept of the improved closed-loop proportional control algorithm for the integrated systems is to predict the varying correlation of photosensor signal to daylight workplane illuminance according to roller shade height and sky conditions for improvement of the system accuracy. In this study, the performance of the integrated systems with two improved closed-loop proportional control algorithms was compared with that of the current (modified) closed-loop proportional control algorithm. In the results, the average maintenance percentage and the average discrepancies of the target illuminance, as well as the average time under 90% of target illuminance for the integrated systems significantly improved in comparison with the current closed-loop proportional control algorithm for daylight responsive dimming systems as a single system.

DOI10.1016/j.buildenv.2010.10.007
LBNL Report Number

LBNL-4418E