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).

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• 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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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

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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

Rethinking occupancy-based office lighting

ir. Christel de BakkerBuilding Lighting groupTechnische Universiteit Eindhoven Thank you for your attention!

Any questions?