WPsmart im Bestand

Construction Systems and Components − Easier and Faster Construction

Wärmepumpenfeldtest – Fokus Bestandsgebäude und smarter Betrieb

© Fraunhofer ISE

The success of energy transition depends largely on the energetic retrofitting of existing buildings. Next to construction measures aimed at reducing heating demand, the focus is on improving the efficiency of heating systems. A further component of the transformation of the energy system is the practical linking in electricity and heat sectors. Electrically driven heat pumps can play an essential role in both issues. Therefore, the four-year research project “WPsmart im Bestand” has been launched at the 1st December 2014. Headed by the Fraunhofer ISE, corporate heat pump manufacturer and energy suppliers, both issues are closely examined in a project..

Within four years, knowledge of the efficiency of heat pumps in different renovated single-family houses as well as their flexibility regarding load management should be gained.

The project objectives in detail:

  • identification of optimal solutions for the use of heat pumps for room heating and domestic hot water heating in existing buildings
  • metrological investigation of 100 heat pumps over three heating seasons (including 20 heat pumps over two seasons with smart control systems)
  • energetic, ecological and economic valuation of monovalent, monoenergetic as well as bivalent (hybrid) driven heat pump systems
  • evaluation of the potential as provider of system services using functionalities according to “SG-Ready”- regulations
  • guidelines for system compatible regulation and design of future heat pump systems (SG Ready 2.0)


As set out in figure 2 above, a detailed metrological investigation of a large volume of different applications is realised over a longer period. Besides monovalent or monoenergetic outside air- and ground heat pumps, the focus is on bivalent (hybrid) systems, that further disposed an oil or gas boiler. After the first heating period, 20 systems will be transferred into the smart, network- or rather efficient controlled use. The other 80 systems are further examined in heat-driven mode.  The preparation of the smart control includes the development of suitable control strategies using interface certified by the “SG-Ready”-label.

Projekt-Homepage: www.wp-smart-im-bestand.de

Ansprechpartner: Dr.-Ing. Marek Miara

Cooperation partners: ait-deutschland GmbH, Bosch Thermotechnology GmbH, Elektrizitätswerk Mittelbaden GmbH, Glen Dimplex Wärmepumpemtechnik GmbH, Lechwerke AG, Max Weishaupt GmbH, Ochsner Wärmepumpen GmbH, Stadtwerke Stuttgart GmbH, Stiebel Eltron GmbH & Co. KG, Vaillant Deutschland GmbH & Co. KG, Viessman Group GmbH & Co. KG