Paper Conference

Proceedings of ASim Conference 2016: 3rd Asia conference of IBPSA-China, Japan, Korea


Randomness of occupants' presences for building energy simulation

K. Ahn, W. Suh, H. Chu, S. Ra, C. Park

Abstract: Occupant behavior is regarded as one of the major factors contributing to the performance gap between simulation prediction and real energy use. Over the past several decades, in simulation tools, occupants have been represented as static. However, this approach of the assumption of static occupants cannot account for the dynamic behavior of occupants. Recently, many occupant models have been developed based on observed data. Such occupant models are formulated in a probabilistic fashion, e.g. discrete Markov Chain or agent-based Markov Chain. This paper reports new evidence suggesting that occupants' presences follow a random walk pattern. The occupants' presences in two university laboratories and three university library rooms were monitored. The assumption of the random walk pattern was tested using the Normalized Cumulative Periodogram (NCP) method. It can be concluded that in certain types of buildings, occupants' presences should be treated as a random walk pattern rather than being modeled in the stochastic fashion.
Keywords: Occupant presence, Occupant behavior, Performance gap, Random walk