Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5478678 | Geothermics | 2017 | 12 Pages |
Abstract
The heat contained in underground flooded mine workings is actively exploited, often via heat pump technology, at a number of locations in Europe and North America. Several different heat exchange configurations may be utilised in this context, but for those (“standing column” and “open loop” arrangements) were mine water reinjection is practised, the rate of heat transfer between mine walls and mine water is a critical process to quantify. The two most commonly-used analytical solutions to this problem have been applied to the same baseline scenario, exploring and comparing their sensitivity, strengths, weaknesses and areas of application. It is found that the RodrÃguez- DÃaz solution generally predicts heat transfer rates (typically of the order of several tens of W per m of tunnel) greater than the Lauwerier-Pruess-Bodvarsson approach, the difference being due to the fact that the former assumes a radial heat conductive flow geometry in the rock surrounding the mine void, while the latter assumes a less efficient parallel linear flow. The RodrÃguez-DÃaz solution is more appropriate for approximately cylindrical mine shafts and tunnels. The Lauwerier-Pruess-Bodvarsson approach is more likely to be applicable to tabular mined void geometries. Improvements to the RodrÃguez and DÃaz model are proposed to enhance its transparency and applicability.
Keywords
Related Topics
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Authors
Covadonga Loredo, David Banks, Nieves RoqueñÃ,