The success of the “Energiewende” depends significantly on the refurbishment of the existing buildings. Beside construction measures for reducing the space heating energy demand the efficiency improvement of the heating system has to be focused. Another important component within the transformation of the energy system is the appropriate combination of the sectors electricity and heat. Thus, in December 2014 the research project “WPsmart im Bestand” (“HPsmart in Existing Buildings”) was launched. Under the lead of Fraunhofer ISE and together with heat pump manufacturers as well as utilities both research fields should be examined within one project.
Within four years knowledge about the efficiency of heat pumps in older single family houses with different refurbishment standards as well as heat pump´s flexibility for load management should be gained. The explicit project goals are:
- Identification of solutions for the appropriate application of heat pumps for space heating and domestic hot water in existing buildings
- Metrological monitoring of 100 heat pumps over three heating periods (20 of them over two heating periods with smart control)
- Energetically, ecologically and economically assessment of monovalent, monoenergetic as well as bivalent (hybrid) driven heat pump systems
- Determining the potential for services with applying the functionality provided by “SG Ready”-control
- Recommendations for system compatible control and design of future heat pumps systems („SG Ready 2.0”)
As shown in Fig. 2 a detailed metrological investigation of a huge amount of heat pump systems in individual applications will be carried out for a long period. The focuses are on monovalent or monoenergetic air and ground source heat pumps as well as bivalent (hybrid) systems, which additionally using oil or gas. After the first heating period 20 heat pumps are going to be transferred to smart operation serving grid or energy market needs. The remaining 80 heat pumps will keep the conventional operation mode over the whole three heating periods. The preparation of the smart control includes the development of appropriate strategies considering the “SG ready” certificated functionality.