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http://hdl.handle.net/10397/88668
Title: | Influences of different factors on the three-dimensional heat transfer of spiral-coil energy pile group with seepage | Authors: | You, T Yang, HX |
Issue Date: | Aug-2020 | Source: | International journal of low-carbon technologies, Aug. 2020, v. 15, no. 3, p. 458-470 | Abstract: | Energy pile group is an important component of ground source heat pumps with foundation piles as ground heat exchangers. Among different energy piles, those with spiral pipes have a large heat exchange area between the pipe and the concrete, achieving good heat exchanging performance and wide applications. To analyze the influence of geometrical parameters (pile layout, pile spacing and pile depth) and external parameter (groundwater velocity) on the heat transfer of spiral-coil energy pile groups, a three-dimensional analytical model of spiral-coil energy pile groups with seepage is used, considering the thermal interaction among different piles, the geometry of spiral pipe and the velocity of groundwater. The soil temperature distribution in the energy pile group is studied under conditions with different factors (pile layouts: 3 x 2, L shape and line shape; pile spacing distances: 3, 5 and 7 m; pile depths: 10, 30 and 50 m; and groundwater velocities: 0, 1.2 x 10(-6) and 2.0 x 10(-6) m/s). The 3-year outlet fluid temperature of energy pile group affected by the above different factors under different inlet fluid temperatures and velocities or soil thermal exchange ratios is investigated. Results show that for the low fluid velocity inside the piles, the influence of above factors on the thermal performance of energy piles is more obvious. Large groundwater velocity, line shape pile layout, large pile spacing distance and short pile depth can alleviate the long-term temperature variation caused by unbalanced soil heat exchange. This work will facilitate the research, design and application of the energy pile group in ground source heat pumps. | Keywords: | Energy pile group Influential factors Analytical model Soil temperature distribution Seepage |
Publisher: | Oxford University Press | Journal: | International journal of low-carbon technologies | ISSN: | 1748-1317 | EISSN: | 1748-1325 | DOI: | 10.1093/ijlct/ctaa006 | Rights: | © The Author(s) 2020.|This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercialre-use, please contact journals.permissions@oup.com The following publication You, T., & Yang, H. X. (2020). Influences of different factors on the three-dimensional heat transfer of spiral-coil energy pile group with seepage. International Journal of Low-Carbon Technologies, 15(3), 458-470 is available at https://dx.doi.org/10.1093/ijlct/ctaa006 |
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