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Joint Project: QEWSplus

Quality Enhancement of Shallow Geothermal Systems

Lead management Project management Project duration Grant number Project Partners
Borehole hole heat exchangers and related systems, subsumed as shallow geothermal systems, are widely used as a heat source for ground-coupled heat pumps for heating, as a heat sink for cooling and as thermal energy storage systems for either heating, cooling or a combination of both operating modes. Using this wide range of applications and the particular advantage of weather- and season-independent availability, shallow geothermal systems can make an important contribution to more renewable energies.

In the joint project QEWSplus "Quality enhancement of shallow geothermal systems", important aspects of quality assurance and enhancement for shallow geothermal systems are investigated and solutions are developed based on the predecessor project, the joint research project "QEWS II: Quality assurance for borehole heat exchangers II" (Grant number: 03ET1386A-G, www.qews2.de ). Thereby, all relevant phases are considered, starting from design and planning to construction and up to commisioning. The project intends to contribute tot he reduction of risks, the reduction of energy production costs, the increase of efficiency and system availability as well as to a greater awareness and public acceptance of these technologies. The joint project comprises the following subprojects:

• Advanced thermal test methods
  • In-situ-system-TRT
  • Development of a method and measuring device for the characterization of trench collectors
  • Analysis and optimisation of short time-backfill-check TRTs and other innovative BHE measurement methods
• Further development of the emulated borehole heat exchanger (E-BHE) to check TRT devices
• Quality requirements for borehole heat exchanger (BHE) backfilling materials
  • Filtration characteristics of BHE backfilling materials
  • Determination of the hydraulic permeability of system samples
  • Realistic combination of investigation aspects of filtration effects
  • Backfill material quality check for BHEs under real conditions
  • New backfilling concept for BHE´s
• Multifunctional modelling of shallow geothermal systems
  • Extension of consistent modelling
  • Extension of the functionality of the model library
  • Adaptation of the design models to real and future heat load profiles

Project Partners

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