Background and activities

The purpose of my PhD project is to determine the active heating and cooling strategies that are adapted for highly-insulated buildings, with a special focus on heat pump technologies and cold climate. The systems performance will be analysed in terms of energy efficiency, cost-effectiveness, thermal comfort and robustness for users (each of these dimensions is essential to ensure market penetration, user acceptance and correct operation).

Reducing energy use in buildings is the central part of the efforts to reach national and international targets for improved building energy performance (e.g. Nearly Zero Energy Buildings or Zero Emission Buildings). The main strategy to minimize this building energy use is to firstly reduce the energy needs, such as reducing the space-heating needs using thermal insulation of the building envelope, and secondly to implement energy-efficient systems to cover these limited needs. New buildings concepts are thus consistently based on highly-insulated building envelopes where the space-heating needs have been drastically reduced (e.g. passive house level).

The Energy and Indoor Environment group has a well-established expertise as regards energy supply systems and services in buildings.  For instance, the group is strongly involved in the Norwegian FME research centre on Zero Emission Buildings (ZEB) ( as well as in various IEA Tasks or Annexes.

Scientific, academic and artistic work

Displaying a selection of activities. See all publications in the database

Part of book/report

  • Clauss, John; Sartori, Igor; Alonso, Maria Justo; Thalfeldt, Martin; Georges, Laurent. (2017) Investigations of Different Control Strategies for Heat Pump Systems in a Residential nZEB in the Nordic Climate. Proceedings of 12th IEA Heat Pump Conference.
  • Clauss, John; Kauko, Hanne; Hafner, Armin; Eikevik, Trygve Magne. (2015) Wärmepumpen als Teil eines Smart Thermal Grids. Deutsche Kälte- und Klimatagung 2015 Dresden.


  • Vogler-Finck, Pierre; Clauß, John; Georges, Laurent; Sartori, Igor; Wisniewski, Rafael. (2018) Inverse model identification of the thermal dynamics of a Norwegian zero emission house. Cold Climate HVAC 2018 ; Kiruna. 2018-03-12 - 2018-03-15.
  • Clauß, John. (2017) Design and control of heat pump systems in energy flexible buildings in cold climate. Seminar on Canadian experiences of applying building physics at different scales . NTNU Salvatore Carlucci; NTNU. 2017-06-15 - 2017-06-15.
  • Clauß, John. (2017) Key performance indicators for demand side flexibility. IEA HPT Annex49 Meeting ; Rotterdam. 2017-05-16 - 2017-05-16.
  • Clauß, John. (2017) Part I: Overview of IEA EBC Annex 67 Part II: Active heating systems in highly-insulated and energy flexible buildings in cold climate. 12th IEA Heat Pump Conference Rotterdam 2017 Workshop Energy Technology Network ; Rotterdam. 2017-05-15 - 2017-05-18.
  • Clauß, John; Finck, Christian; Vogler-Finck, Pierre; Beagon, Paul; Peán, Thibault; Zhang, Kun. (2017) Review of applied and tested control possibilities for energy flexibility in buildings B.2.1. IEA EBC Annex67 Meeting ; Freiburg. 2017-03-15 - 2017-03-17.
  • Clauß, John; Georges, Laurent. (2017) Design of a modulating heat pump system and the impact on the seasonal coefficient of performance. BuildSim Nordic 2017 . IBPSA Nordic; Lund. 2017-09-21 - 2017-09-22.
  • Clauß, John; Georges, Laurent. (2017) Design of a modulating heat pump system and the impact on the seasonal coefficient of performance. VVS dagene på NTNU IBPSA Nordic Seminar . VVS-Foreningen; NTNU. 2017-11-02 - 2017-11-02.
  • Clauß, John; Vogler-Finck, Pierre. (2017) Using experimental data to identify a grey-box model and calibrate a white box model. IEA EBC Annex67 Meeting ; Graz. 2017-09-27 - 2017-09-29.
  • Vogler-Finck, Pierre; Clauß, John; Georges, Laurent. (2017) A dataset to support dynamical modelling of the thermal dynamics of a super-insulated building. zenodo. 2017.
  • Clauß, John. (2016) Heat Pump Systems Adapted to Energy-Flexible and Highly Insulated Buildings in Cold Climate. BuildSim Nordic 2016 . IBPSA Nordic; Trondheim. 2016-09-26 - 2016-09-27.
  • Clauß, John; Alonso, Maria Justo; Georges, Laurent; Stene, Jørn. (2016) Multifunctional Heat Pumps in NZEB –Annex 49 under IEA Heat Pump Programme. IEA HPT Annex49 Meeting ; Nürnberg. 2016-10-13 - 2016-10-14.