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Open AccessArticle

A New Method Based on Thermal Response Tests for Determining Effective Thermal Conductivity and Borehole Resistivity for Borehole Heat Exchangers

1
Faculty of Drilling, Oil and Gas, Department of Drilling and Geoengineering, Laboratory of Geoenergetics, AGH University of Science and Technology (AGH UST), al. Mickiewicza 30, 30-059 Krakow, Poland
2
Faculty of Engineering and Applied Science, University of Ontario Institute of Technology, 2000 Simcoe Street North, Oshawa, ON L1H 7K4, Canada
3
Faculty of Mathematics and Natural Sciences, University of Rzeszow, Al. Rejtana 16c, 35-959 Rzeszów, Poland
*
Author to whom correspondence should be addressed.
Energies 2019, 12(6), 1072; https://doi.org/10.3390/en12061072
Received: 10 January 2019 / Revised: 16 March 2019 / Accepted: 17 March 2019 / Published: 20 March 2019
Research on borehole heat exchangers is described on the development of a method for the determination, based on thermal response tests, of the effective thermal conductivity and the thermal resistivity for borehole heat exchangers. This advance is important, because underground thermal energy storage increasingly consists of systems with a large number of borehole heat exchangers, and their effective thermal conductivities and thermal resistivities are significant parameters in the performance of the system (whether it contains a single borehole or a field of boreholes). Borehole thermal energy storages provide a particularly beneficial method for using ground energy as a clean thermal energy supply. This benefit is especially relevant in cities with significant smog in winter. Here, the authors describe, in detail, the development of a formula that is a basis for the thermal response test that is derived from Fourier’s Law, utilizing a new way of describing the basic parameters of the thermal response test, i.e., the effective thermal conductivity and the thermal resistivity. The new method is based on the resistivity equation, for which a solution giving a linear regression with zero directional coefficient is found. Experimental tests were performed and analyzed in support of the theory, with an emphasis on the interpretation differences that stem from the scope of the test. View Full-Text
Keywords: geoenergetics; ground source heat pumps; borehole heat exchangers; thermal response test; borehole thermal energy storage geoenergetics; ground source heat pumps; borehole heat exchangers; thermal response test; borehole thermal energy storage
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Sapińska-Sliwa, A.; Rosen, M.A.; Gonet, A.; Kowalczyk, J.; Sliwa, T. A New Method Based on Thermal Response Tests for Determining Effective Thermal Conductivity and Borehole Resistivity for Borehole Heat Exchangers. Energies 2019, 12, 1072.

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