As one of three from over 2000 submissions, our work on occupancy learning-based demand-driven building control has been selected for a 2017 Best Paper Award from the journal Building and Environment. The research was led by our colleagues at ETH Zurich, Switzerland, and was implemented in the 3-for-2 building in Singapore. The award is given to the paper for
its originality, contributions to the field, quality of presentation, and soundness of the science
Yuzhen Peng, Adam Rysanek, Zoltán Nagy, Arno Schlüter, Occupancy learning-based demand-driven cooling control for office spaces, In Building and Environment, Volume 122, 2017, Pages 145-160
Free access until June 30, 2018: https://doi.org/10.1016/j.buildenv.2017.06.010.
Occupancy in buildings is one of the key factors influencing air-conditioning energy use. Occupant presence and absence are stochastic. However, static operation schedules are widely used by facility departments for air-conditioning systems in commercial buildings. As a result, such systems cannot adapt to actual energy demand for offices that are not fully occupied during their operating time. This study analyzes a seven-month period of occupancy data based on motion signals collected from six offices with ten occupants in a commercial building, covering both private and multi-person offices. Based on an occupancy analysis, a learning-based demand-driven control strategy is proposed for sensible cooling. It predicts occupants’ next presence and the presence duration of the remainder of a day by learning their behavior in the past and current days, and then the predicted occupancy information is employed indirectly to infer setback temperature setpoints according to rules we specified in this study. The strategy is applied for the controls of a cooling system using passive chilled beams for sensible cooling of office spaces. Over the period of two months both a baseline control and the proposed demand-driven control were operated on forty-two weekdays of real-world occupancy. Using the demand-driven control, an energy saving of 20.3% was achieved as compared to the benchmark. We found that energy savings potential in an individual office was inversely correlated to its occupancy rate.