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Rethinking occupancy-based office lighting
ir. Christel de BakkerBuilding Lighting groupTechnische Universiteit Eindhoven
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IntroductionDefinition of occupancy-based office lighting
Rethinking occupancy-based office lighting – Christel de Bakker
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IntroductionTopic
• Occupancy-based lighting control
on floor level
Rethinking occupancy-based office lighting – Christel de Bakker
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IntroductionTopic
• Occupancy-based lighting control
on desk level
Rethinking occupancy-based office lighting – Christel de Bakker
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Goal
Current state of research
Studies
Vision
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IntroductionStudy object
Rethinking occupancy-based office lighting – Christel de Bakker
Open-plan& flexible workspaces
Smart LED connected lighting system
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IntroductionStudy object
Rethinking occupancy-based office lighting – Christel de Bakker
= optimal use of lighting & space
Occupancy
Illuminance
CO2
Temperature
+ location of desk/zone
Relative humidity
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Current lighting control strategy Per zone
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Current lighting control strategyPer zone
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Current lighting control strategyIndependent of individual occupant behaviour
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Current lighting control strategyIndependent of individual occupant behaviour
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Current lighting control strategyIndependent of individual occupant behaviour
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Current lighting control strategyIndependent of individual occupant behaviour
Chang, W. K., & Hong, T. (2013, March). Statistical analysis and modeling of occupancy patterns in open-plan offices using measured lighting-switch data. In Building Simulation (Vol. 6, No. 1, pp. 23-32). Tsinghua Press.12:00 13:00
• Different occupancy patterns
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Current lighting control strategyIndependent of individual occupant behaviour
Maleetipwan-Mattsson, P., & Laike, T. (2015). Optimal office lighting use: a Swedish case study. Facilities, 33(9/10).
7:14
15:44
9:48 12:00 13:00 17:42
• Different arrival and departure times
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Current lighting control strategyIndependent of individual occupant behaviour
• Non-optimal lighting use
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17:42
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Main research question
How can occupancy-based lighting be optimally used in open-plan offices?
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Current state of researchEnergy savings in private offices
Von Neida, B., Manicria, D., & Tweed, A. (2001). An analysis of the energy and cost savings potential of occupancy sensors for commercial lighting systems. Journal of the Illuminating Engineering Society, 30(2), 111-125.
5 min10 min15 min20 min
• Baseline: no occupancy sensor
• Savings during day-time62%
73%
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Current state of researchOpen-plan offices?
Rethinking occupancy-based office lighting – Christel de Bakker
+ comfort of co-workers
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• Individual characteristics
Chang, W. K., & Hong, T. (2013, March). Statistical analysis and modeling of occupancy patterns in open-plan offices using measured lighting-switch data. In Building Simulation (Vol. 6, No. 1, pp. 23-32). Tsinghua Press.
Studies1. Reveal individual occupancy patterns
and their underlying factors
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• Spatial characteristics
Chang, W. K., & Hong, T. (2013, March). Statistical analysis and modeling of occupancy patterns in open-plan offices using measured lighting-switch data. In Building Simulation (Vol. 6, No. 1, pp. 23-32). Tsinghua Press.
Studies1. Reveal individual occupancy patterns
and their underlying factors
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• Time characteristics
Bouffaron, P. (2014). Revealing Occupancy Diversity Factors in Buildings Using Sensor Data
Studies1. Reveal individual occupancy patterns
and their underlying factors
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Studies1. Reveal individual occupancy patterns
and their underlying factors
Rethinking occupancy-based office lighting – Christel de Bakker
• Restrictions
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Studies2. Develop spatial clustering methods
Rethinking occupancy-based office lighting – Christel de Bakker
• Occupancy profiles
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Studies2. Develop spatial clustering methods
Rethinking occupancy-based office lighting – Christel de Bakker
• Lighting preferences
e.g. illuminance level
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Studies2. Develop spatial clustering methods and create acceptance
Rethinking occupancy-based office lighting – Christel de Bakker
• Workspace preferences
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Studies3. Development of occupancy-based lighting control strategies tailored to open-plan office
Control characteristicse.g. time delay setting, dimming level
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Studies4. Occupancy lighting control strategies tailored to individual worker within cluster
Rethinking occupancy-based office lighting – Christel de Bakker
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Studies4. Occupancy lighting control strategies tailored to individual worker within cluster
Garg, V., & Bansal, N. K. (2000). Smart occupancy sensors to reduce energy consumption. Energy and Buildings, 32(1), 81-87.
typical workday
inactivity period
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Studies4. Occupancy lighting control strategies tailored to individual worker within cluster
71 sec54 sec39 sec 17 sec
inactivity period
Garg, V., & Bansal, N. K. (2000). Smart occupancy sensors to reduce energy consumption. Energy and Buildings, 32(1), 81-87.
typical workday
inactivity period
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AimOptimal lighting use & comfort
Rethinking occupancy-based office lighting – Christel de Bakker
lighting = occupancy comfort of worker & co-workers