Počet záznamů: 1
Heat extraction calculations for deep coaxial borehole heat exchangers: matrix analytical approach
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SYSNO ASEP 0577638 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Heat extraction calculations for deep coaxial borehole heat exchangers: matrix analytical approach Tvůrce(i) Matyska, C. (CZ)
Zábranová, Eliška (USMH-B) ORCID, RIDZdroj.dok. Geophysical Journal International - ISSN 0956-540X
Roč. 235, č. 3 (2023), s. 2323-2338Poč.str. 16 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova Numerical approximations and analysis ; Heat flow ; Hydrothermal systems Obor OECD Energy and fuels CEP TP01010055 GA TA ČR - Technologická agentura ČR Způsob publikování Open access Institucionální podpora USMH-B - RVO:67985891 UT WOS 001124759000011 EID SCOPUS 85175449383 DOI 10.1093/gji/ggad367 Anotace Deep boreholes represent a source of clean energy. Therefore, effective calculations of potential extraction of heat from boreholes for realistic models of the Earth’s crust with variable thermal conductivity and diffusivity are needed. We deal with heat extraction in a quasi-steady state from coaxial boreholes where downward and upward flows of pumped fluid (water) are separated by an inner pipe and connected only at the bottom. We first obtain theoretical estimates of heat extraction for a thermally isolated inner pipe and a model of the ground with constant thermal diffusivity and conductivity. Then, we develop a new analytical matrix method for a general layered ground model that enables us to include depth-dependent ground properties as well as heat exchange between the downward and upward flows of fluid in the borehole. Our straightforward and fast approach is thus suitable for various parametric studies or as a tool for benchmarks of numerical software. A key role in heat extraction from coaxial boreholes is played by the inner-pipe thermal resistance. We apply our method to the parametric study showing the dependence of pumped water temperature and total heat extraction from the borehole on realistic borehole geometries under different amounts of water pumping. The calculations are performed for a 3 km deep borehole as the representative of present deep boreholes used for extraction of geothermal energy and for a 10 km deep borehole. Drilling of such a superdeep borehole has just started in China and our results demonstrate potential limits of geothermal energy extraction from such great depths. Pracoviště Ústav struktury a mechaniky hornin Kontakt Iva Švihálková, svihalkova@irsm.cas.cz, Tel.: 266 009 216 Rok sběru 2024 Elektronická adresa https://doi.org/10.1093/gji/ggad367
Počet záznamů: 1