Dynamic modeling of presence of occupants using inhomogeneous Markov chains

Philip Hvidthøft Delff Andersen, Anne Iversen, Henrik Madsen, Carsten Rode

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Occupancy modeling is a necessary step towards reliable simulation of energy consumption in buildings. This paper outlines a method for fitting recordings of presence of occupants and simulation of single-person to multiple-persons office environments. The method includes modeling of dependence on time of day, and by use of a filter of the observations it is able to capture per-employee sequence dynamics. Simulations using this method are compared with simulations using homogeneous Markov chains and show far better ability to reproduce key properties of the data. The method is based on inhomogeneous Markov chains with where the transition probabilities are estimated using generalized linear models with polynomials, B-splines, and a filter of passed observations as inputs. For treating the dispersion of the data series, a hierarchical model structure is used where one model is for low presence rate, and another is for high presence rate.
Original languageEnglish
JournalEnergy and Buildings
Volume69
Pages (from-to)213-223
ISSN0378-7788
DOIs
Publication statusPublished - 2014

Keywords

  • Energy utilization
  • Hierarchical systems
  • Markov processes

Cite this