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Joint Project: QEWS II

Qualitätssicherung bei Erdwärmesonden II mit Beteiligung am IEA ECES Annex 27

Lead management
Bayerisches Zentrum für Angewandte Energieforschung e.V. (ZAE Bayern)
Project management
Hanne Karrer (
Project duration
01.10.2016 – 31.03.2020
Grant number
Project Partners
ZAE Bayern
enOware GmbH
Burkhardt GmbH
Due to the wide range of applications, shallow geothermal energy with borehole heat exchangers (BHEs) and related systems can make an important contribution to the energy transition. Due to the intrusion into the subsurface and the possible consequences for groundwater and soil, special care must be taken during planning, construction and operation to ensure a long-term efficient operation of the systems and to reliably prevent potential damage. Quality assurance is therefore of particular importance in all phases of the plant's life, from planning to commissioning, during operation and after decommissioning. For this reason, various aspects of quality assurance for BHEs were investigated as part of this joint project. In order to improve the quality of the in-situ determination of key input parameters for the design and dimensioning of BHEs, a procedure for checking measuring equipment for thermal response tests was developed. Consistent design models for various shallow geothermal systems were also developed and implemented. Furthermore, methods for improving the backfilling of boreholes and its sealing function for BHEs were investigated. In-situ measurement methods for quality monitoring and surveillance of BHEs were also developed. The results and the expertise of the project participants were incorporated into the international IEA ECES Annex 27. This describes recommendations and procedures for quality assurance during the design, construction and operation of borehole heat exchanger systems. In addition, key project results have been and will be incorporated into (future) parts of the VDI 4640 guideline and the European standard EN 17522, which is currently being developed. This is made possible by the close co-operation between the CEN TC 451 WG2 working group and the IEA ECES Annex 27 working group.

The final report on this project can be downloaded here: