Deutscher Kaelte und Klimatechischer Verein (DKV) Paper (2019)

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Deutscher Kaelte und Klimatechischer Verein (DKV) Paper (2019)

Presentation of GEOFIT at the 45th Annual Meeting of the Deutscher Kaelte und Klimatechnischer Verein (2019)

Title: Erdwärmepumpen für die energieeffiziente Gebäudesanierung

Language: German

Authors: Michael Lauermann (*1), Johann Emhofer (*1), Edith Haslinger (*1), Karl Ochsner (*2)

*1: AIT Austrian Institute of Technology GmbH, Center for Energy,
*2: Ochsner Wärmepumpen GmbH

Summary: The integration of geothermal systems for heating / cooling solutions in conjunction with heat pump technology is a major challenge, particularly in the case of renovation. In order to find the best solution for the increased flow temperatures compared to a new building for the renovation, various heat pump configurations are evaluated according to energy and economic criteria. A refrigerant with low greenhouse gas potential (GWP) is used as the working medium, e.g. R1234ze (E)) less than 10 used. A favorable refrigeration circuit configuration for high flow temperatures is a twin-circuit system, which essentially consists of two heat pumps with different condensing temperatures and the same evaporation temperatures. An alternative to this is a single-stage configuration with a significantly larger condenser for improved supercooling. Both systems should enable efficient operation when renovating buildings.