The potential use of mine water for a district heating scheme: A case study, Caerau, Upper Llynfi valley, South Wales, UK

Brabham, Peter, Manju, Manju, Thomas, Hywel ORCID: https://orcid.org/0000-0002-3951-0409, Farr, Gareth, Francis, Robert, Sahid, Ramsha and Sadasivam, Sivachidambaram ORCID: https://orcid.org/0000-0002-2305-0292 2020. The potential use of mine water for a district heating scheme: A case study, Caerau, Upper Llynfi valley, South Wales, UK. Quarterly Journal of Engineering Geology and Hydrogeology 53 (1) , 145. 10.1144/qjegh2018-213

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Abstract

The feasibility of recovering heat energy from mine water contained within an abandoned coal mine in South Wales is assessed for a proposed district heating scheme. The study area is the village of Caerau, in the Upper Llynfi Valley, Bridgend County Borough, South Wales, UK, comprising around 750 residential houses, a primary school and 17 commercial properties. This paper describes: an archival geological and mining desk study focussed on Caerau colliery, consideration of regional mine linkages, GIS techniques used to create a 3D initial conceptual geological mine model of Caerau workings, permitting and licencing requirements, community engagement activities undertaken and the findings of a single exploratory borehole. The borehole intersected a void space in flooded mine workings around the horizon of the Six Foot seam at a depth of 224 m below ground level, as predicted by the conceptual mine model. The rest water level within the borehole lies at 92m below ground level and the measured in situ temperature of the mine water at the base of the borehole was 20.3 °C. An unexpectedly high and sustained geothermal gradient of approximately 53 °C/km was calculated from repeated measured temperature profiles.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Publisher:	Geological Society
ISSN:	1470-9236
Last Modified:	25 Oct 2023 06:17
URI:	https://orca.cardiff.ac.uk/id/eprint/126695

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