TY - CHAP A1 - Hanfstaengl, Lucia A1 - Parzinger, Michael A1 - Spindler, Uli A1 - Wellisch, Ulrich A1 - Wirnsberger, Markus T1 - Identifying occupant presence in a room based on machine learning techniques by measuring indoor air conditions T2 - E3S Web of Conferences, 12th Nordic Symposium on Building Physics (NSB 2020) N2 - Knowing about the presence and number of people in a room can be of interest for precise control of heating, ventilation and air conditioning. To determine the number and presence of occupants cost-effectively, it is of interest to use already existing air condition sensors (temperature, humidity, CO2) of the building automation system. Different approaches and methods for determining presence have attracted attention in recent years. We propose an occupancy detection method based on a method of supervised machine learning. In an experiment, measurement data were recorded in a research apartment with controllable boundary conditions. The presence of people was simulated by artificial injection of water vapour, CO2 and heat dissipation. The variation of the number of artificial users, the duration of presence and the supply air volume flow of the ventilation resulted in a total of 720 combinations. By using artificial users, the boundary conditions were accurately defined, and different presence situations could be measured time-effectively. The data is evaluated with a method of supervised machine learning called random forest. The statistical model can determine precisely the number of people in over 93% of the cases in a disjoint test sample. The experiments took part in the Rosenheim Technical University of Applied Sciences laboratory. KW - occupancy KW - maschine learning KW - random forest Y1 - 2020 UR - https://doi.org/10.1051/e3sconf/202017222005 VL - 172 SP - 22005 ER -