GEOFIT - ground source heat pump systems for energy efficient building retrofitting 
In Europe, the building sector is responsible for 40% of the total energy consumption and represents about a third of Europe’s CO2 emissions. This is a huge socioeconomic and environmental problem, more if we con-sider that almost half of the EU buildings have boilers installed before 1992, with an efficiency rate of below 60%. Although energy renovation of existing buildings could help to achieve the EU climate and energy tar-gets, the refurbishment rate is currently below 1% and renewables are not widely used in the building sec-tor.
Within the H2020 project GEOFIT, easy-to-install, economical and enhanced geothermal systems for energy efficient building retrofitting are going to be implemented and demonstrated at five dedicated pilot sites across Europe - a historical building (ITA), a school (ESP), an indoor swimming pool (IRL), an office build-ing (FRA) and a single-family house (IRL).
The integration of ground systems with heating/cooling solutions and heat pumps to achieve maximum performance is a great challenge that demands a solution. In order to find the best solution for each pilot site with respect to increased supply temperatures compared to a new building, different heat pump config-urations are analyzed. As working fluid, a Low Global Warming Potential (GWP) refrigerant (e.g. R1234ze(E)) with a GWP smaller than 10 will be used. The system will include alternative cost-effective heat exchangers to be used with the Low GWP refrigerant like plate heat exchangers made of Aluminum instead of Copper.
One favorable heat pump configuration is a twin-cycle system which basically consists of two heat pumps with different condensation temperatures but with the same temperature on the source side. Alternatively, a single-stage configuration which uses a significantly larger condenser for enhanced subcooling is also ana-lyzed. Both systems allow a more efficient operation compared to state-of-the-art heat pump systems in the case of building retrofitting. So far, no residential ground source heat pump system exists where these tech-nologies (Low GWP, Aluminum heat exchangers) were combined. At the end of the demonstration phase in the GEOFIT project, the action will increase the commercial attractiveness of geothermal energy in combina-tion with ground source heat pumps and therefore increase the penetration of this renewable source in building retrofitting.
--- Datum: 23.10.2019 Uhrzeit: 14:10 - 14:35 Uhr Ort: Saal Brüssel, NCC Mitte