Validation of the operation efficiency criteria for geothermal probes in flooded mine workings

User Rating:  / 0


D.V.Rudakov,, Dnipro University of Technology, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

O.V.Inkin,, Dnipro University of Technology, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

повний текст / full article

Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2021, (5): 100 - 105


To develop and test the energy and cost criteria for evaluating the operation efficiency of a closed geothermal system using coaxial or U-shaped probes that can be installed in flooded workings of mines.

To justify the energy and cost criteria, we applied thermodynamic, hydraulic and cost-efficiency relationships, conducted the engineering analysis of closed geothermal systems, studied hydrogeological settings and geothermal conditions of the mines of the Selidovo group in Donbas. The developed criteria were examined within the ranges of key parameters such as the flow rate of the heat transfer fluid and the probe submerged length.

We quantified the influence of the probe submerged length and the heat transfer fluid flow rate on the energy balance and the net present value NPV and identified the parameter combinations that allow achieving efficient heat recovery in terms of energy balance and cost-efficiency. The produced/spent energy ratio may reach 1.52.2 and the NPV a few dozen thousand when increasing the submerged depth to 500 m at the flow rate of 20m3/d. A higher flow rate may lead to a negative energy balance but the NPV remains positive within some ranges of the probe submerged length, thus, indicating the system profitability. The payback period can be shortened to a few years.

The proposed energy criterion balances the thermal energy produced and the thermal equivalent of electric energy generated using fossil fuel and spent on system operation. This ratio as distinct from the usually applied COP parameter allows comparing the energies of the same nature and drawing more adequate conclusions on environmental acceptability of a geothermal system.

Practical value.
The proposed criteria can be used for prioritization of geothermal system installation and the operation efficiency evaluation among the number of potential sites in post mining areas.

mine water; geothermal probes, energy criteria, thermal energy, net discount value


1. Phillips, S. (2015). Paris climate deal: Historic climate change agreement reached at COP21. ABC Australia. Retrieved from,-balanced-draft-climate-agreement/7023712.

2. Michael A. Clark, Nina G.G.Domingo, Kimberly Colgan, SumilK.Thakrar, & David Tilman (2020). Global food system emissions could preclude achieving the 1.5 and 2C climate change targets. Science, Vol.370, 705-708.

3.Limarenko, A.N., & Taranenko, O.O. (2015). Environmental consequences of obtaining and using geothermal energy in Ukraine. Technological audit and production reserves, 3, 4-8.

4.Sadovenko, I., Rudakov, D., & Inkin, O. (2014). Geotechnical schemes to the multi-purpose use of geothermal energy and resources of abandoned mines. Progressive Technologies of Coal, Coalbed Methane, and Ores Mining, 443-450.

5.LANUV NRW (2018). Landesamt fr Natur, Umwelt, und Verbraucherschutz Nordrhein-Westfahlen: Potenzialstudie warmes Grubenwasser. Fachbericht 90. Recklinghausen.

6.Bojadgieva, K., Benderev, A., Gerginov, P., & Hristov, V. (2013). The Abandoned Underground Cherno More Coal Mine (SE Bulgaria) a Source of Low Grade Geothermal Energy. Comptes rendus de lAcadmie Bulgare des Sciences: Sciences mathmatiques et naturelles, 66, 565-572.

7.Sadovenko, I., Inkin, O., & Zagrytsenko, A. (2016). Theoretical and geotechnological fundamentals for the development of natural and man-made resources of coal deposits. Mining of Mineral Deposits, 10(4), 1-10.

8.Rudakov, D., Inkin, O., Dereviahina, N., & Sotskov, V. (2020). Effectiveness evaluation for geothermal heat recovery in closed mines of Donbas. E3S Web of Conferences 201, 01008. Ukrainian School of Mining Engineering, 1-10.

9.Ramos, E.P., Breede, K., & Falcone, G. (2015). Geothermal heat recovery from abandoned mines: a systematic review of projects implemented worldwide and a methodology for screening new projects. Environ Earth Sci, 73, 6783-6795.

10.Empfehlungen Oberflchennahe Geothermie Planung, Bau, Betrieb und berwachung (2015). Deutschen Gesellschaft fr Geowissenschaften e.V. (DGG), Deutschen Gesellschaft fr Geotechnik e.V. (DGGT).

11. Thermal pumping units Viesmann. Design instruction. Vitocal 300/350 (n.d.). Retrieved from

12. Zakharenko, S. O. (2017). Development and calculation of a heat pump for the needs of heat supply of an industrial facility Tyumen Industrial University. Tyumen: Publishing Center BIK.

13.Beshta, O., Kuvaiev, V., Mladetskyi, L., & Kuvaiev, M. (2020). Ulpa particle separation model in a spiral classifier. Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, (1), 31-35.

14.Beshta, O.S. (2012). Electric drives adjustment for improvement of energy efficiency of technological processes. Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, 4, 98-107.

15. Ulitsky, O.A., Ermakov, V.M., Lunova, O.V., & Boyko, K.YE. (2019). Prior to the assessment of the forecast of changes in the hydrogeological minds of the techno-ecosystem of the Selidivskoy group of mines. Ecological safety and environmental protection, (4), 32-42.

16.Fomin, V.O. (2015). Forecasting changes in the inflow of groundwater into the abandoned mine. Coal of Ukraine, (5), 20-24.

17. Sherbak, V.V. (2018). Analysis of threats and environmental risks arising from the defeat of mining enterprises in the area of local military conflict in eastern Ukraine. Collection of scientific works of DonSTU, 40-46.

18. Dolinsky, A.A. (2016). Geothermal energy: production of electric and thermal energy. Bulletin of the NAS of Ukraine, (11), 76-86.

19. Technologies of production and use of geothermal energy. Scientific and technical portal Retrieved from

20. Surtaev, V.V. (2016). Development of geothermal energy industry in Ukraine. Mining Bulletin, (99), 83-88.



This Month
All days

Guest Book

If you have questions, comments or suggestions, you can write them in our "Guest Book"

Registration data

ISSN (print) 2071-2227,
ISSN (online) 2223-2362.
Journal was registered by Ministry of Justice of Ukraine.
Registration number КВ No.17742-6592PR dated April 27, 2011.


D.Yavornytskyi ave.,19, pavilion 3, room 24-а, Dnipro, 49005
Tel.: +38 (056) 746 32 79.
e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
You are here: Home Archive by issue 2021 Content №5 2021 Validation of the operation efficiency criteria for geothermal probes in flooded mine workings