Occupant use of switching and dimming controls in offices

Boyce, P.R.; Veitch, Jennifer A.; Newsham, Guy R.; Jones, C C; Heerwagen, Judith; Myer, Michael; Hunter, Claudia M.

doi:10.1177/1477153506070994

Cited by 119 publications

(83 citation statements)

References 18 publications

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“…Similar results have been found previously [104], [107], [121]. By allowing the users to dim the lighting according to their preferences, energy savings may be achieved, as some of the users may prefer lower illuminances.…”

Section: Discussion and Analysissupporting

confidence: 73%

“…This has been confirmed also in the previous research [104]- [107]. Therefore, additional CCT and dimming control can increase user comfort in a space, by allowing each user to set the lighting according to their own preferences.…”

Section: Relation Between Illuminance Level Preferences and Energy Cosupporting

confidence: 66%

“…The average preferred illuminance level for long-term office work was 648 lx with FL lighting and 517 lx with LED lighting. The preferred illuminances were slightly higher than in some previous findings [104]- [106] but close to those found in [107].…”

Section: User Adjusted Illuminance Level and Cct Preferencescontrasting

confidence: 48%

See 2 more Smart Citations

Electrical efficiency study of alternating current and direct current power topologies in office building with integrated photovoltaics in Matlab-Simulink environment

Viitanen

Halonen

2014

Journal of Renewable and Sustainable Energy

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Ene rgy e ffic ie nt l igh t ing syst e ms in buil dings w it h int e grat e d ph o t o vo l t aic s J a nne V i i t a ne n D O C T O R A L D I S S E R T A T I O N SAalto University publication series DOCTORAL DISSERTATIONS 18/2015 Energy efficient lighting systems in buildings with integrated photovoltaics Janne Viitanen A doctoral dissertation completed for the degree of Doctor of Science (Technology) to be defended, with the permission of the Aalto University School of Electrical Engineering, at a public examination held at the lecture hall S1 of the school on 6 March 2015 at 12. Aalto University School of Electrical Engineering Department of Electrical Engineering and Automation Lighting Unit AbstractThe goal of this thesis was to study how a building integrated photovoltaic system, choice of lighting technology and the selected system voltage affect the energy efficiency of an office building. The quality of the lighting was considered also, as it is essential that users accept the lighting.The energy production of photovoltaic system (PV) was evaluated in Southern Finland through onsite PV measurements from several different compass points and tilt angles during 2010-2013. Based on the measurements, the PV system was sized to provide energy for lighting and office appliances. The energy efficiency of the devices had considerable effect on the sizing of the PV system. The seasonal variations in the PV production were considerable, as only few per cent of the summer time insolation was available during the winter.The energy efficiency and quality of lighting was studied. Fluorescent lighting (FL) and LED lighting were compared, as they are the most used options in offices today. Lighting measurements and a user study was conducted. Different illuminance levels and correlated colour temperatures (CCT) were studied. The studied parameters included glare, reading task performance, identification of detail, colour naturalness and pleasantness, illuminance level sufficiency and pleasantness, pleasantness of the lighting in general and naturalness of the shadows. The subjects also set their own preferred illuminance levels and CCTs. No major differences were found in the subjective preferences at equal illuminance levels between luminaire types. On average, an illuminance level around 600 lx and a CCT around 4000 K were preferred. LEDs were found more energy efficient than FLs and the difference increased when the luminaires were dimmed.In the last part of the research the electricity consumption of an office building was compared with system voltages 12 VDC, 24 VDC, 48 VDC and 230 VAC through computer simulations in a Matlab-Simulink environment. It was found that 230 VAC was the most energy efficient option as a general system voltage, with the selected components and system variables. The 24 VDC was the most energy efficient option with fluorescent lighting and the 48 VDC with LED lighting, if only the lighting system was considered. Aurinkosähkön tuotantoa Etelä-Suomessa tutkittiin mittausten avulla eri il...

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Section: Discussion and Analysissupporting

confidence: 73%

Section: Relation Between Illuminance Level Preferences and Energy Cosupporting

confidence: 66%

See 1 more Smart Citation

Electrical efficiency study of alternating current and direct current power topologies in office building with integrated photovoltaics in Matlab-Simulink environment

Viitanen

Halonen

2014

Journal of Renewable and Sustainable Energy

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“…Different people prefer varying illuminances for the same task. It has also been established that those buildings with most overrides are also the most energy efficient [34][35][36][37][38][39].…”

Section: Lighting Controls and Lenimentioning

confidence: 99%

Lighting Design in Europe: Aligning the Demands for Lower Energy Usage with Better Quality

Kelly¹,

Duff²

2015

JCEA

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Lighting design is one of the fastest changing areas in building engineering. It has evolved significantly in recent years due to changing technology and demands for improved quality, better control, reduced energy and sustainability. This paper is an overview of what is happening in Europe and elsewhere and examines the literature to find that latest recommendations in the Code for Lighting issued by the SLL (Society of Light and Lighting) in the UK change previous demands for equal illuminance across a working plane to more specific and demanding criteria. There are recommendations for qualitative metrics and better distribution of light so as to enhance the visual appearance of interiors. European standards are also examined and the LENI (lighting energy numerical indicator) has been found to be a better way of reducing energy than installed load. New LED (light-emitting diode) lamp technology is examined and daylight is discussed in the context of these changing demands. It is found that lighting standards and design are changing for the better but that standards will need to evolve further if they are to ensure good quality lighting.

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“…Furthermore, several works show a convergent result: when present in the office rooms, the blinds frequently stay fixed for a long time in positions which prevent the incidence of direct sunlight or thermal radiation only during critical periods, even after they have ceased (BOYCE et al, 2006; CORREIA DA SILVA; LEAL; ANDERSEN, 2013); so is very common rooms with closed blinds at various levels and using electric light.…”

Section: Introductionmentioning

confidence: 99%

Lighting preferences in individual offices

2017

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Abstractorkplaces with good daylighting offer visual comfort to users, give them a series of physiological and psychological benefits and allow good performance of visual activities, besides saving energy. However, this solution is not always adopted: lighting type preferences involve many variables besides the availability of daylight. This paper explores a case study through the analysis of questionnaire answers and computer simulations of a series of metrics related to quality of lighting with the aim of finding explanations for the lighting preferences of individual office users. The results show that, although the offices present good daylighting conditions and no glare potential, and users are satisfied with daylighting, these parameters are not sufficient to explain the predominant lighting preferences. The findings have also shown that there is no consensus about which parameters potentially cause visual comfort, while the parameters that cause discomfort are clearly identified. In addition, in this study, 49% of the preference for mixed lighting (daylight plus electrical light) can be explained by the fact that mixed lighting produces better modeling than daylighting alone. Keywords

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Occupant use of switching and dimming controls in offices

Cited by 119 publications

References 18 publications

Electrical efficiency study of alternating current and direct current power topologies in office building with integrated photovoltaics in Matlab-Simulink environment

Electrical efficiency study of alternating current and direct current power topologies in office building with integrated photovoltaics in Matlab-Simulink environment

Lighting Design in Europe: Aligning the Demands for Lower Energy Usage with Better Quality

Lighting preferences in individual offices

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