IEA HPP Annex 32

Economical heating and cooling systems for low energy houses
National webpage Germany
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German national project


The national project of Germany is dedicated to field monitoring of heat pumps for low energy houses.
A large field test of about 100 heat pumps is conducted in co-operation with 7 heat pump manufacturers and 2 utilities.
The heat pump types in field testing are mainly ground-coupled brine-to-water as well as some outdoor-air-to-water and water-to-water heat pumps. The first part of the field test has been started in 2006 and will continue until 2008. Some systems will continue to be measured until 2010. In summer 2008 further 30 systems will be installed and measured until 2010.
Results shall serve An example of the measurement points for a brine-to-water heat pump is given in Fig. 1.

online visualisation field testing Germany
Fig.1    Example of online visualisation with measurement points for heat flows, electricity inputs and temperatures

Moreover, another field test of heat pumps in the application of retrofitting of boilers will be accomplished in charge of the German utility E.ON in the years 2006-2009. Heat sources for the retrofit application are brine-to-water and air-to-water heat pumps. The selected houses comprise annual energy needs for space heating in the range of 150-250 kWh/m2/a and requirements for high supply temperatures. Results shall deliver the feasibility of this retrofit option in terms of energy savings, CO2-emission reduction and the economy of the system.


The results of the German contribution are documented in five
Best Practice Sheets and the field monitoring report.





Download article on German national project Article in German
Article on the German national project

KI Luft Kälte Klimatechnik,
September 2007, p. 24-27
Download Best Practice Sheet Best practice sheet in English
Best Practice Sheet
B/W-heat pump with horizontal collector and energy fence with floor heating and DHW in Spechbach
Download Best Practice Sheet Best practice sheet in English
Best Practice Sheet
B/W-WP mit vertical borehole heat exchanger with floor heating and DHW in Neuffen
Download Best Practice Sheet Best practice sheet in English
Best Practice Sheet
B/W-WP with vertical borehole heat exchanger with floor heating and DHW in Gaggenau
Download Best Practice Sheet Best practice sheet in English
Best Practice Sheet
B/W-HP with vertical borehole heat exchanger with floor heating and DHW in Köngen
Download Best Practice Sheet Best practice sheet in English
Best Practice Sheet
Outdoor A/W-heat pump for floor heating and exhaust air heat pump for DHW in Buchenbach
Download report report in German
Final Report (long version)
Wärmepumpen Effizienz - Messtechnische Untersuchung von Wärmepumpenanlagen zur Analyse und Bewertung der Effizienz im realen Betrieb - Langfassung
Download report report in German
Final Report (short version)
Wärmepumpen Effizienz - Messtechnische Untersuchung von Wärmepumpenanlagen zur Analyse und Bewertung der Effizienz im realen Betrieb - Kurzfassung