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Relative constructability and thermal performance of cast-in-place concrete energy pile: Coil-type GHEX (ground heat exchanger)

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  • Park, Sangwoo
  • Lee, Dongseop
  • Choi, Hyun-Jun
  • Jung, Kyoungsik
  • Choi, Hangseok

Abstract

Energy piles encase heat exchange pipes in a pile foundation to use geothermal energy. This paper evaluates the constructability and thermal performance of energy piles equipped in a large-diameter drilled shaft. Two energy piles were constructed by fabricating coil-type heat exchange pipes in cast-in-place concrete piles. The coil pitch was designed to be 200 mm and 500 mm, respectively. The constructability of each energy pile was evaluated in terms of time and ease for installing. In-situ TRTs were performed to compare the thermal performance of energy piles. The relative heat exchange efficiency for the coil pitch 200 mm is only 1.2 times greater than that of the coil pitch 500 mm energy pile, even though the coil pitch 200 mm energy pile encases the heat exchange pipe 2.4 times as longer as the coil pitch 500 mm. In addition, the result of TRTs was compared with two well-known analytical to estimate thermal properties of ground formation. A thermal performance test was carried out by applying artificial cooling operation to the energy piles, and indicates the heat exchange rate is not directly proportional to the pipe length because the tighter coil pitch configuration may cause thermal interference between the coil loops.

Suggested Citation

  • Park, Sangwoo & Lee, Dongseop & Choi, Hyun-Jun & Jung, Kyoungsik & Choi, Hangseok, 2015. "Relative constructability and thermal performance of cast-in-place concrete energy pile: Coil-type GHEX (ground heat exchanger)," Energy, Elsevier, vol. 81(C), pages 56-66.
    • Handle: RePEc:eee:energy:v:81:y:2015:i:c:p:56-66
    DOI: 10.1016/j.energy.2014.08.012
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    References listed on IDEAS

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    1. Jun, Liu & Xu, Zhang & Jun, Gao & Jie, Yang, 2009. "Evaluation of heat exchange rate of GHE in geothermal heat pump systems," Renewable Energy, Elsevier, vol. 34(12), pages 2898-2904.
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    5. Oh, Kwanggeun & Lee, Seokjae & Park, Sangwoo & Han, Shin-In & Choi, Hangseok, 2019. "Field experiment on heat exchange performance of various coaxial-type ground heat exchangers considering construction conditions," Renewable Energy, Elsevier, vol. 144(C), pages 84-96.
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    11. Lazaros Aresti & Paul Christodoulides & Gregoris P. Panayiotou & Georgios Florides, 2020. "Residential Buildings’ Foundations as a Ground Heat Exchanger and Comparison among Different Types in a Moderate Climate Country," Energies, MDPI, vol. 13(23), pages 1-22, November.
    12. Paul Christodoulides & Ana Vieira & Stanislav Lenart & João Maranha & Gregor Vidmar & Rumen Popov & Aleksandar Georgiev & Lazaros Aresti & Georgios Florides, 2020. "Reviewing the Modeling Aspects and Practices of Shallow Geothermal Energy Systems," Energies, MDPI, vol. 13(16), pages 1-45, August.
    13. Sung, Chihun & Park, Sangwoo & Lee, Seokjae & Oh, Kwanggeun & Choi, Hangseok, 2018. "Thermo-mechanical behavior of cast-in-place energy piles," Energy, Elsevier, vol. 161(C), pages 920-938.
    14. Alberdi-Pagola, Maria & Poulsen, Søren Erbs & Loveridge, Fleur & Madsen, Søren & Jensen, Rasmus Lund, 2018. "Comparing heat flow models for interpretation of precast quadratic pile heat exchanger thermal response tests," Energy, Elsevier, vol. 145(C), pages 721-733.
    15. Park, Sangwoo & Lee, Seokjae & Park, Sangyeong & Choi, Hangseok, 2022. "Empirical formulas for borehole thermal resistance of parallel U-type cast-in-place energy pile," Renewable Energy, Elsevier, vol. 197(C), pages 211-227.
    16. Jinli Xie & Yinghong Qin, 2021. "Heat Transfer and Bearing Characteristics of Energy Piles: Review," Energies, MDPI, vol. 14(20), pages 1-15, October.
    17. Sangwoo Park & Seokjae Lee & Hyobum Lee & Khanh Pham & Hangseok Choi, 2016. "Effect of Borehole Material on Analytical Solutions of the Heat Transfer Model of Ground Heat Exchangers Considering Groundwater Flow," Energies, MDPI, vol. 9(5), pages 1-19, April.
    18. Ren, Lian-wei & Xu, Jian & Kong, Gang-qiang & Liu, Han-long, 2020. "Field tests on thermal response characteristics of micro-steel-pipe pile under multiple temperature cycles," Renewable Energy, Elsevier, vol. 147(P1), pages 1098-1106.
    19. Pan, Aiqiang & McCartney, John S. & Lu, Lin & You, Tian, 2020. "A novel analytical multilayer cylindrical heat source model for vertical ground heat exchangers installed in layered ground," Energy, Elsevier, vol. 200(C).

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