Preferred luminous conditions in open-plan offices: research and practice recommendations

Veitch, Jennifer A.; Newsham, Guy R.

doi:10.1177/096032710003200404

Cited by 148 publications

(96 citation statements)

References 20 publications

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“…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 Preferencessupporting

confidence: 78%

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: User Adjusted Illuminance Level and Cct Preferencessupporting

confidence: 78%

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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“…The relationship between gender and light quality (satisfaction with office lighting and task lighting) was identified in the field study by Aries et al [16]. Knez and Enmarker [31] reported that lighting was perceived significantly differently by females compared to males, but gender was unrelated to lighting preferences [41] or the effects of lighting on cognitive task performance [18]. In open-plan offices, environmental conditions such as office layout planning, privacy and lighting were evaluated more negatively by female workers compared to males [44].…”

Section: Kim J De Dear R Cândido C Zhang H Arens E 2013 Gender mentioning

confidence: 99%

Gender differences in office occupant perception of indoor environmental quality (IEQ)

Kim

Dear

Cândido

et al. 2013

Building and Environment

199

100

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This paper investigates the gender differences in the occupants' perception on various aspects of indoor environmental quality (IEQ) by two lines of inquiry; Firstly, a comprehensive literature survey spanning the research areas of indoor air quality (IAQ), sick building syndrome (SBS), thermal comfort, lighting, and acoustics was conducted. Secondly, statistical analyses were performed on a large, predominantly North American Post-Occupancy Evaluation (POE) database (N=38,257).Statistical analyses indicated that female occupants' satisfaction levels were consistently lower than male occupants for all fifteen IEQ factors (including thermal comfort, air quality, lighting, acoustics, office layout & furnishings, and cleanliness & maintenance) addressed in POE questionnaire, and the differences were statistically significant. Logistic regression analysis identified a significant association between female gender and dissatisfaction with individual IEQ factors. Those gender differences quantified by odds ratios (OR) were most pronounced for dissatisfaction with thermal environment, IAQ, and workspace cleanliness. The analyses produced consistent results, even after potential confounding factors such as age and work characteristics were controlled.

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“…We are also experienced in conducting lighting experiments in real spaces of this kind. We used a photograph of a cubicle in the same physical space as that studied by Veitch & Newsham [15][16] because their results could then be compared to the results of this study.…”

Section: The Imagementioning

confidence: 99%

“…All of the studies we refer to in this section excluded daylight and derived preferences for electric lighting only, analogous with our study. Veitch and Newsham 16 conducted a study in the same laboratory space in which the photograph used in this study was taken. Participants had dimmable control over three lighting circuits (one indirect and two direct) as well as on-off control over an undershelf task light.…”

Section: Are Preferred Luminances and Ratios The Same As Those Derivementioning

confidence: 99%

“…This is encouraging because studies of individual preference in real spaces also report a wide variety of choices. We performed a quantitative comparison to the results of Veitch and Newsham 16 . In Figure 13 we plot two measures of the frequency of preferred brightness in the field of view, one from this study and one from Veitch and To facilitate comparison between the different measures we have expressed preference in terms of the (approximate) maximum available choice in each respective experiment.…”

Section: Are Preferred Luminances and Ratios The Same As Those Derivementioning

confidence: 99%

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Preferred Surface Luminances in Offices, by Evolution

Newsham

Marchand

Veitch

2004

Journal of the Illuminating Engineering Society

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. Society, 33, 1, pp. 14-29, 2004-02-01 Preferred surface luminances in offices, by evolution Newsham, G. R.; Marchand, R. G.; Veitch, J. A. office, and rated them for attractiveness. The image was projected onto a screen at realistic luminances and 54% of full size. The images in the series were geometrically identical, but the luminances of important surfaces were independently manipulated. Initially, the combinations of luminances were random, but as the session continued a genetic algorithm was used to generate new images that generally retained features of prior images that were rated most highly. As a result, the images presented converged on an individual's preferred combination of luminances. The results demonstrated that this technique was effective in reaching a participant's preferred combination of luminances. There were significant differences in room appearance ratings of the most attractive image compared to other images, and the differences were in the expected direction. Factor analysis of ratings of the most attractive images revealed a factor structure with some similarity to that obtained when people rated real office spaces. Furthermore, preferred luminances were similar to those chosen by people in real settings, as was the variation in preferences between individuals. Journal of the Illuminating EngineeringFinally, subjective ratings of brightness, uniformity and attractiveness were significantly related to luminances in the image.

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Preferred luminous conditions in open-plan offices: research and practice recommendations

Cited by 148 publications

References 20 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

Gender differences in office occupant perception of indoor environmental quality (IEQ)

Preferred Surface Luminances in Offices, by Evolution

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