Numerical analysis of enhanced conductive deep borehole heat exchangers

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dc.contributor.authorRenaud, Théo
dc.contributor.authorPan, Lehua
dc.contributor.authorDoran, Hannah R.
dc.contributor.authorFalcone, Gioia
dc.contributor.authorVerdin, Patrick G.
dc.date.accessioned2021-06-30T10:57:32Z
dc.date.available2021-06-30T10:57:32Z
dc.date.issued2021-06-19
dc.description.abstractGeothermal energy is a reliable and mature energy source, but it represents less than 1% of the total renewable energy mix. While the enhanced geothermal system (EGS) concept faces technical validation challenges and suffers from public acceptance issues, the development of unconventional deep-well designs can help to improve their efficiency and reliability. Modelling single-EGS-well designs is key to assessing their long-term thermal performances, particularly in unconventional geological settings. Numerical results obtained with the T2WELL/EOS1 code have been validated with available experimental data from a deep borehole heat exchanger (DBHE), where a temperature of 358 ∘" role="presentation" style="max-height: none; display: inline; line-height: normal; word-spacing: normal; overflow-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; min-width: 0px; min-height: 0px; border-width: 0px; border-style: initial; position: relative;">∘C has been measured at a depth of 1962 m. Based on a calibrated model, the thermal performances of two enhanced thermal conductive DBHEs with graphite were compared for high geothermal gradients. The analysis highlights the potential recovery of a variable fraction of vapour. Graphite used along the well appears to be the most suitable solution to enhance the thermal output by 5 to 8% when compared to conventional wells. The theoretical implementation of such well in the Newberry volcano field was investigated with a single and doublet DBHE. The findings provide a robust methodology to assess alternative engineering solutions to current geothermal practices.en_UK
dc.identifier.citationRenaud T, Pan L, Doran H, et al., (2021) Numerical analysis of enhanced conductive deep borehole heat exchangers. Sustainability, Volume 13, Issue 12, June 2021, Article number. 6918en_UK
dc.identifier.issn2071-1050
dc.identifier.urihttps://doi.org/10.3390/su13126918
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/16831
dc.language.isoenen_UK
dc.publisherMDPIen_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectgraphiteen_UK
dc.subjectunconventional geothermal energyen_UK
dc.subjectT2Wellen_UK
dc.subjectdeep borehole heat exchangeren_UK
dc.titleNumerical analysis of enhanced conductive deep borehole heat exchangersen_UK
dc.typeArticleen_UK

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