Advanced

Lighting control systems in individual offices at high latitude: measurements of lighting conditions and electricity savings

Gentile, Niko LU ; Håkansson, Håkan LU and Dubois, Marie-Claude LU (2013) 7th International Conference on Energy Efficiency in Commercial Buildings 1. p.333-344
Abstract
This paper presents measurement results of electricity use and lighting conditions in individual office rooms located in Lund, Sweden. The aim is to demonstrate the energy saving potential by using different lighting systems and the satisfaction of users. The measurements are carried out in one empty reference room and four fully occupied test rooms equipped with different electric light control systems. The tested systems include: a presence detector (automatic switch on/off), a manual switch at the door combined with absence detector (automatic switch off), a photoelectric dimming combined with presence detector, and a switchable task light with no ambient lighting except daylight. The four rooms are fully occupied by test persons... (More)
This paper presents measurement results of electricity use and lighting conditions in individual office rooms located in Lund, Sweden. The aim is to demonstrate the energy saving potential by using different lighting systems and the satisfaction of users. The measurements are carried out in one empty reference room and four fully occupied test rooms equipped with different electric light control systems. The tested systems include: a presence detector (automatic switch on/off), a manual switch at the door combined with absence detector (automatic switch off), a photoelectric dimming combined with presence detector, and a switchable task light with no ambient lighting except daylight. The four rooms are fully occupied by test persons performing their normal computer-based tasks, and who make a subjective evaluation of lighting conditions in the room and control system once a week. The results for the first monitoring period show that the automatic switch on/off (presence) system is the one yielding the highest electricity use, which repeats earlier simulation results. The photoelectric dimming system which combines a presence detector yields very modest energy savings compared to the presence detector system, a result which contradicts earlier findings but which may be explained by malfunctions and poor sensor position. The room with the task lamp achieves the lowest energy use, which is mostly attributed to the low levels of illumination in the room, which is further confirmed by the test persons. The system with manual switch at the door combined with absence detector achieves the best results in terms of combined low energy use and user satisfaction, and the magnitude of the savings are generally greater than anticipated in earlier simulation studies achieved in the same context. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
lighting control systems, individual offices, energy savings, daylight, absence, presence, daylight harvesting, task lighting
host publication
[Host publication title missing]
editor
Bertoldi, Paolo; Trenev, Gueorgui; and
volume
1
pages
12 pages
publisher
Publications Office of the European Union
conference name
7th International Conference on Energy Efficiency in Commercial Buildings
conference location
Frankfurt
conference dates
2012-04-18
ISSN
1831-9424
ISBN
978-92-79-28222-5
DOI
10.2790/77021
language
English
LU publication?
yes
id
e0dc63aa-a8d6-41e8-8ece-386a1352210e (old id 5274512)
alternative location
http://iet.jrc.ec.europa.eu/energyefficiency/sites/energyefficiency/files/ReqNo_JRC75412__IEECB_2012_Proceedings_ONLINE.pdf
date added to LUP
2015-04-14 13:11:16
date last changed
2018-11-21 20:10:49
@inproceedings{e0dc63aa-a8d6-41e8-8ece-386a1352210e,
  abstract     = {This paper presents measurement results of electricity use and lighting conditions in individual office rooms located in Lund, Sweden. The aim is to demonstrate the energy saving potential by using different lighting systems and the satisfaction of users. The measurements are carried out in one empty reference room and four fully occupied test rooms equipped with different electric light control systems. The tested systems include: a presence detector (automatic switch on/off), a manual switch at the door combined with absence detector (automatic switch off), a photoelectric dimming combined with presence detector, and a switchable task light with no ambient lighting except daylight. The four rooms are fully occupied by test persons performing their normal computer-based tasks, and who make a subjective evaluation of lighting conditions in the room and control system once a week. The results for the first monitoring period show that the automatic switch on/off (presence) system is the one yielding the highest electricity use, which repeats earlier simulation results. The photoelectric dimming system which combines a presence detector yields very modest energy savings compared to the presence detector system, a result which contradicts earlier findings but which may be explained by malfunctions and poor sensor position. The room with the task lamp achieves the lowest energy use, which is mostly attributed to the low levels of illumination in the room, which is further confirmed by the test persons. The system with manual switch at the door combined with absence detector achieves the best results in terms of combined low energy use and user satisfaction, and the magnitude of the savings are generally greater than anticipated in earlier simulation studies achieved in the same context.},
  author       = {Gentile, Niko and Håkansson, Håkan and Dubois, Marie-Claude},
  editor       = {Bertoldi, Paolo and Trenev, Gueorgui},
  isbn         = {978-92-79-28222-5},
  issn         = {1831-9424},
  keyword      = {lighting control systems,individual offices,energy savings,daylight,absence,presence,daylight harvesting,task lighting},
  language     = {eng},
  location     = {Frankfurt},
  pages        = {333--344},
  publisher    = {Publications Office of the European Union},
  title        = {Lighting control systems in individual offices at high latitude: measurements of lighting conditions and electricity savings},
  url          = {http://dx.doi.org/10.2790/77021},
  volume       = {1},
  year         = {2013},
}