Energy savings due to occupancy sensors and personal controls: a pilot field study

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ConferenceLux Europa 2009, 11th European Lighting Conference: 09 September 2009, Istanbul, Turkey
Pages745752; # of pages: 8
SubjectDALI, lighting controls, energy savings, electricity demand reductions, open-plan offices; Lighting; Energy efficiency
AbstractA study was conducted in cubicle workstations occupied by individuals conducting their regular office duties. The workstations were lit by dimmable direct-indirect luminaires controlled via DALI protocol by occupancy sensors in each luminaire and personal controls located on the occupants? computer screens. The energy use and power demand attributable to the lighting controls were compared to those of a conventional lighting system previously in place. The occupants? opinion of the DALI system was also examined. Despite a low frequency-of-use, the personal controls were mentioned by 75% of the occupants as a feature they appreciated having. In contrast, only 30% of the occupants liked the occupancy sensors. Despite the fact that the DALI system had an installed lighting power density 50% higher than the conventional system, with both controls in operation it saved 32% in daily energy use. This shows that lighting power density does not uniquely define energy performance. Time-of-use, which is strongly linked to controls, is critically important.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number51264
NPARC number20373922
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Record identifier822bdfd4-dc18-42ef-a606-3a33ccb44d74
Record created2012-07-23
Record modified2016-05-09
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