WS 1 – Heat pumps for nZEB, retrofit and energy flexibility

Summary of workshop on heat pumps for nearly zero energy buildings (nZEB).

This workshop gave an overview of 3 running Annexes, that are in different stages, from just beginning to already well underway. More so, the Annexes from which the work was presented came from different IEA technology collaboration programs: heat pumping technologies (HPT) and energy in buildings and communities (EBC).

In the first part (HPT Annex 49) we learned that although there is no uniform definition of nearly zero energy buildings, there are plenty of interesting examples and research being done, exploring the different definitions in different countries and finding solutions for each situation.
We saw that when it comes to nZEB, there is an important role for HPs but also other technologies like PV, solar thermal and storage.

In the second part (HPT Annex 50) it was presented that multi family houses are a significant part of the total building stock. So there definitely is a potential for heat pump technology . The work of Annex 50 will focus on that. As for the source to use, in this case we often have to deal with urban areas where many renewable sources are hard to use. When restricted possibilities for other sources, the source will be often air driven.

In the last part (EBC Annex 67) we saw that flexible availability of renewable sources makes need for energy flexibility in buildings. One of the items under research is about control mechanisms. Also different systems for thermal energy storage (TES) were presented.

In all cases we saw examples (and need for) good international collaboration, both within and in between Annexes.

As a conclusion I would say that in both nZEB and multifamily buildings, heat pumps will have a high market potential. For the energy production of nZEB, also a close link to energy flexible buildings exist. Another important aspect is domestic hot water (DHW). So, collaboration will be continued or stimulate in future.

IEA HPT Annex 49: Design and integration of heat pumps for nZEB

  • Overview of IEA HPT Annex 49 (C. Wemhoener)
  • Long-term monitoring and smart heat pumps for nZEB (F. Bockelmann, C. Betzold)
  • Vögelebichl Innsbruck – Monitoring and simulation of two multi-family houses with heat pump, PV and collectors (F. Ochs)

IEA HPT Annex 50: Heat pumps in multi-family houses

  • Overview of IEA HPT Annex 50 (M. Miara)
  • Retrofitting fossil fuel heating systems with A/W-heat pumps in multi-family houses (F. Rognon)

IEA EBC Annex 67: Energy flexible buildings

  • Overview of IEA EBC Annex 67 (J. Clauß)
  • Energy flexible smart grid / energy-ready buildings (T. Péan)
  • Energy flexibility of thermal energy storage (C. Finck)

All presentations can be downloaded via this page.