Influence of time constants on low energy buildings' heating control

Tuule Mall Kull, Raimo Simson, Martin Thalfeldt, Jarek Kurnitski

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

2 Citations (Scopus)
187 Downloads (Pure)


This paper estimates the range of time constant values for buildings with different insulation, thermal mass, and heat emitters for efficient temperature control by PI controllers, and comparing heat emission efficiency of the systems. Detailed models of the room, the heat emitter and the control system were used for dynamic simulations. For one case, the results were compared with measurements in a test building. Large variance in time constant values was found depending on the heat emitter, building parameters and the method used for the calculation. Time constant values were in the range of 1.9 to 94 hours. PI control with calculated parameters resulted in up to 8% heating energy difference between the low temperature water radiator and underfloor heating. The measurements showed lower time constant values than the simulations
Original languageEnglish
Title of host publication11th Nordic Symposium on Building Physics, NSB2017, 11-14 June 2017, Trondheim, Norway
Publication statusPublished - 2017
MoE publication typeA4 Article in a conference publication
EventNordic Symposium on Building Physics - Trondheim, Norway
Duration: 11 Jun 201714 Jun 2017
Conference number: 11

Publication series

NameEnergy procedia
ISSN (Electronic)1876-6102


ConferenceNordic Symposium on Building Physics
Abbreviated titleNSB


  • low-energy building
  • heat emission efficiency
  • time constant
  • PI control parameters
  • low temperature heating
  • building automation


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