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QUADRAT DTP: The impact of subsurface heterogeneity on the performance of Aquifer Thermal Energy Storage (ATES) systems

School of Natural and Built Environment | PHD

Applications are now CLOSED
Funding
Funded
Reference Number
SNBE-2022-UO1
Application Deadline
1 December 2021
Start Date
3 October 2022

Overview

Global energy needs are steadily rising with a predicted increase of 45% within the next 15 years. In the long-term, sustainable energy is hoped to connect economic growth to increased social equity while preserving natural resources in line with the UN sustainable development goals. In this context, geothermal energy present one of the potential key pillars to achieve this goal. The application of shallow geothermal energy systems has been increasing over the past decades with >1.7 million units installed across the EU in 2015. One of the commonly applied designs for geothermal installations are open loop systems consisting of abstraction and re-injection wells installed in the aquifer system/groundwater body to extract heat from or to inject/store heat into the aquifer. A particular design of open loop geothermal installations support Aquifer Thermal Energy Storage (ATES) systems which allow the seasonal storage of waste heat in the subsurface for subsequent use to meet heating demands. The efficiency of the s ystem relies on the productivity of the well installations as well as suitable aquifer properties (incl. aquifer permeability & porosity and thermal properties).

The planned research project will investigate the impact of subsurface heterogeneity on the performance of ATES installations. Subsurface heterogeneities may be associated with depositional features of sedimentary aquifers or discontinuities such as fractures, igneous intrusions or faults and may affect hydraulic and thermal properties of the host rock. These heterogeneities may affect the groundwater flow regime within the aquifer unit and impact on ability of the aquifer to store and conduct heat. This in turn may ultimately affect the overall efficiency and sustainability of the ATES installation.

The project will use the Triassic Sherwood Sandstone Aquifer as a case study example. The Sherwood Sandstone Aquifer is an important regional aquifer across central England and Northern Ireland that hosts deep potable groundwater to depth >100m. The study will combine full-scale field experiments utilising existing borehole installations at Queen’s University Belfast with numerical modelling studies. The study will combine the baseline characterisation of the aquifer system by completing a series of active borehole geophysical measurements, hydraulic borehole tests, with the long-term monitoring of experimental thermal injection tests using fibre optic distributed temperature sensing. Collected monitoring data will be integrated into numerical heat transport models to evaluate field-scale subsurface properties to better understand the impact of aquifer heterogeneity on system performance.

The project will be run in close collaboration with the British Geological Survey (BGS) and the Geological Survey of Northern Ireland (GSNI). To this end, the research student may benefit from additional supervision and in-house expertise of senior BGS/GSNI researchers and access to key BGS/GSNI facilities. Beyond the central training opportunities provided by the QUADRAT programme, the project will provide specific training in the areas of, hydraulic testing and downhole geophysics as well as numerical groundwater flow and heat transport modelling.

More project details are available here: www.quadrat.ac.uk/quadrat-projects/

How to apply:
www.quadrat.ac.uk/how-to-apply/

Funding Information

QUADRAT studentships are open to UK and Overseas candidates. Funding will cover UK tuition fees/stipend/research & training support grant only.

Before applying please check full funding and eligibility information: www.quadrat.ac.uk/funding-and-eligibility/

Project Summary
Supervisor

Dr Ulrich Ofterdinger

More Information

u.ofterdinger@qub.ac.uk

Research Profile


Mode of Study

Full-time: 3 years

Part-time: 6 years


Funding Body
NERC QUADRAT DTP
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