Evaluation of analytical models for heat transfer in mine tunnels

Loredo, C.; Banks, David; Roqueñí, Nieves

doi:10.1016/j.geothermics.2017.06.001

Cited by 19 publications

(8 citation statements)

References 29 publications

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“…A system comprising an abstraction well-heat exchanger-reinjection well is termed a geothermal well doublet. A good understanding of subsurface flow pathways between the wells of a doublet, and of the potential for rock-water heat exchange along such pathways [43,44], is key to the sustainability of such systems. Potentially, the migration of a cold front from a reinjection well could be relatively rapid, and lead to thermal "feedback" if the abstraction and reinjection wells are located in the same worked seam [45] (hence the desirability of separation).…”

Section: Open System With Reinjectionmentioning

confidence: 99%

“…on whether voids are open or filled with waste). Long and tortuous flow pathways are preferred since mine roadways and voids can have low surface area-to-volume ratios and rapid water flow, with relatively low heat exchange per metre of flow pathway [44]. Conversely, if the intended flow pathway between wells is not of suitable permeability, the minewater resource can become depleted around the abstraction wells, with elevated head and possible surface break-out around the reinjection well [46].…”

Section: Open System With Reinjectionmentioning

confidence: 99%

“…pump-perturbed) mining system. Analytical or numerical modelling of mine systems may assist in understanding [44,86,104], but should be approached with caution. The behaviour of many mine systems may be reliant on a few critical hydrogeological pathways (drifts, open shafts or roadways) and may be dramatically affected by unpredictable factors: is a ventilation door on a roadway open or closed; is a water dam intact, leaking or failed; has a section of workings collapsed and, if so, is it still transmissive; has a shaft been backfilled with permeable or impermeable material?…”

Section: Planning and Feasibilitymentioning

confidence: 99%

“…This led to the reconfiguration of the mine void more as a thermal store or buffer, than as a source of heating and cooling, with temperature changes within the subsurface minimised. At present, the prospect of a wholly reliable modelling approach to heat transfer in complex networks of subsurface mine voids seems distant, but the approach of [86], involving a conduit network approach coupled to tunnel heat exchange [44], seems promising. The use of empirical techniquesappropriate pumping test techniques, solute and heat tracer tests, and diligent ongoing monitoring of abstracted and reinjected water temperature and chemistry-are to be encouraged.…”

Section: Thermal Feedback/depletion Of Heat Resourcementioning

confidence: 99%

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A Review of the Performance of Minewater Heating and Cooling Systems

et al. 2021

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As the decarbonisation of heating and cooling becomes a matter of critical importance, it has been shown that flooded mines can provide a reliable source of low-carbon thermal energy production and storage when coupled with appropriate demand via an appropriate heat transfer technology. This paper summarises the potential resource represented by a long legacy of mining operations, the means heat can be extracted from (or rejected to) flooded mine workings, and then considers the risks and challenges faced by minewater geothermal energy (MWG) schemes in the planning, construction, and operational phases. A combination of site visits, interviews and literature reviews has informed concise, updated accounts for many of the minewater geothermal energy systems installed across the world, including accounts of hitherto unpublished systems. The paper has found that a number of previously reported MWG schemes are now non-operational. Key risks encountered by MWG schemes (which in some cases have led to decommissioning) include clogging of system components with mineral precipitates (e.g., ochre), uncertainty in targeting open mine voids and their hydraulic behaviour, uncertainty regarding longevity of access to minewater resource, and accumulated ongoing monitoring and maintenance burdens.

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Section: Open System With Reinjectionmentioning

confidence: 99%

Section: Open System With Reinjectionmentioning

confidence: 99%

Section: Planning and Feasibilitymentioning

confidence: 99%

Section: Thermal Feedback/depletion Of Heat Resourcementioning

confidence: 99%

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A Review of the Performance of Minewater Heating and Cooling Systems

et al. 2021

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“…The heat dissipation quantity for the surrounding rock occupies a large proportion in mine thermal hazard problem, which is more than the sum of heat release of other heat sources. With the depletion of shallow mineral resources in most of the mining areas all over the world, the deep mining is inevitable, and the mine thermal hazards is becoming more and more serious [1][2][3]. Therefore, mastering the heat dissipation rules of surrounding rock and calculating the heat dissipation quantity of surrounding rock accurately is of great significance for preventing and controlling coal mine thermal disaster accidents, improving mine labor productivity and ensuring the occupational health of workers [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Dimensionless analysis of transient temperature field of surrounding rock in roadway based on Finite Volume Method

Wang¹,

Qin²,

Han³

et al. 2018

IJHT

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The similar simulation experiment platform for the temperature field of surrounding rock in roadway was established based on similarity theory. It was made possible to verify simulation results of the Finite Volume Method. In order to reveal the heat dissipation rules in roadway, the mathematical model of transient temperature field for the surrounding rock in roadway was established, and dimensionless parameters were introduced into the model to make the model non-dimensional. The Finite Volume Method based on triangular mesh was used to discretize the dimensionless equation and the dimensionless temperature distribution for the transient temperature field of surrounding rock in roadway was obtained. At the wall face in roadway, the dimensionless temperature decreases gradually with the increase of Biot coefficient and Fourier coefficient, and finally tends to a certain value. The curves of the unstable heat transfer criterion and the corresponding laws of variation were obtained by further calculation. The numerical results have shown that the unstable heat transfer criterion decreases with the increase of the Fourier number at a constant Biot coefficient, while it increases with the increase of Biot coefficient at a constant Fourier coefficient. The research results in this paper provide a simple and reliable algorithm to determine the unstable heat transfer criterion derived from the corresponding parameter values of an arbitrary transient temperature field of surrounding rock in roadway. For mine cooling technicians, it provides important reference basis to calculate the chilling requirements and study the heat dissipation rules of surrounding rock in roadway.

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A combined pumping test and heat extraction/recirculation trial in an abandoned haematite ore mine shaft, Egremont, Cumbria, UK

Banks

Steven²,

Berry

et al. 2017

Sustain. Water Resour. Manag.

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A pumping test at rates of up to 50 L s -1 was carried out in the 256 m-deep Florence Shaft of the Beckermet-Winscales-Florence haematite ore mine in Cumbria, UK, between 8th January and 25th March 2015. Drawdowns in mine water level did not exceed 4 m and the entire interconnected mine complex behaved as a single reservoir. Pumping did, however, induce drawdowns of around 1 m in the St. Bees Sandstone aquifer overlying the Carboniferous Limestone host rock. During a second phase of the pumping test, a proportion of the 11.3-12°C mine water was directed through a heat pump, which extracted up to 103 kW heat from the water and recirculated it back to the top of the shaft. Provided that an issue with elevated arsenic concentrations (20-30 lg L -1 ) can be resolved, the Florence mine could provide not only a valuable resource of high-quality water for industrial or even potable uses, it could also provide several hundred to several thousand kW of ground sourced heating and/or cooling, if a suitable demand can be identified. The ultimate constraint would be potential hydraulic impacts on the overlying St Bees Sandstone aquifer. The practice of recirculating thermally spent water in the Florence Shaft produced only a rather modest additional thermal benefit.

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Evaluation of analytical models for heat transfer in mine tunnels

Cited by 19 publications

References 29 publications

A Review of the Performance of Minewater Heating and Cooling Systems

A Review of the Performance of Minewater Heating and Cooling Systems

Dimensionless analysis of transient temperature field of surrounding rock in roadway based on Finite Volume Method

A combined pumping test and heat extraction/recirculation trial in an abandoned haematite ore mine shaft, Egremont, Cumbria, UK

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