Abstract
We present intervention study on energy saving investigating the benefit of controlling ceiling lighting based on occupant presence information obtained at each desk. We show that fine-grained sensing and control is particularly beneficial for lighting control in open plan office spaces. Our intervention was conducted in a 63.8m2 modern open office space over a time of 1.5 months. Ultrasound sensors were installed to obtain presence at each desk. Self-dimming ceiling lights were made individually controllable and a novel building management system (BMS) was implemented. Every two desks and a nearby light were grouped in a cell, implicitly defined by rules of the BMS. Based on the intervention, energy savings of up to 19.01 kWh/m2·year were obtained. Recorded presence and power consumption values were used to simulate alternative lighting control strategies with reduced sensor numbers to further explore energy saving benefits.
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