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Published on: July 24, 2016
Conceptual Modelling of Two Large-Scale Mine Water Geothermal Energy Schemes: Felling, Gateshead, UK
David Banks1, Jonathan Steven2, Adam Black3
1Holymoor Consultancy Ltd., 360 Ashgate Road, Chesterfield S40 4BW, Derbyshire, UK.
Mine water geothermal heat pumps offer low-carbon heating, but aquifer properties and scaling present project risks. Skilled hydrogeologists and engineers are essential for successful development of these renewable energy schemes.
Area of Science:
- Geothermal Energy Engineering
- Hydrogeology
- Low Enthalpy Systems
Background:
- Two megawatt-scale mine water geothermal heat pump schemes are under development in Tyneside, UK.
- These schemes utilize distinct aquifer systems: Upper Aquifer System (UAS), High Main Aquifer System (HMAS), and Deep Mined Aquifer System (DMAS).
- The aquifer systems exhibit vertical discontinuity and unpredictable hydraulic properties.
Purpose of the Study:
- To present a conceptual model of two operational mine water geothermal heat pump schemes.
- To highlight the challenges and risks associated with developing mine water geothermal energy.
- To emphasize the necessity of expert involvement in such projects.
Main Methods:
- Conceptual modeling of geothermal heat pump schemes.
- Description of groundwater abstraction and reinjection processes across different aquifer systems.
- Analysis of drilling outcomes and identification of operational challenges.
Main Results:
- The Abbotsford Road scheme abstracts from UAS and reinjects to HMAS; the Nest Road scheme abstracts from HMAS and reinjects to DMAS.
- Significant project risks were identified, including unpredictable aquifer properties and potential iron hydroxide scaling.
- Five usable production/reinjection boreholes were obtained from ten drilled.
Conclusions:
- Mine water geothermal energy is a viable low-carbon heating and cooling technology.
- Successful development requires skilled hydrogeologists, hydrochemists, and engineers.
- Project risks and maintenance burdens necessitate careful planning and expertise.
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