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Analysis of Heat Exchange Rate for Low-Depth Modular Ground Heat Exchanger through Real-Scale Experiment

Author

Listed:
  • Kwonye Kim

    (Department of Architectural Engineering, Pusan National University, 2 Busandaehak-ro 63, Geomjeong-gu, Busan 46241, Korea)

  • Jaemin Kim

    (Department of Architectural Engineering, Pusan National University, 2 Busandaehak-ro 63, Geomjeong-gu, Busan 46241, Korea)

  • Yujin Nam

    (Department of Architectural Engineering, Pusan National University, 2 Busandaehak-ro 63, Geomjeong-gu, Busan 46241, Korea)

  • Euyjoon Lee

    (Energy Efficiency Research Division, Korea Institute of Energy Research, 152, Gajeong-ro, Yuseong-gu, Daejeon 34129, Korea)

  • Eunchul Kang

    (Energy Efficiency Research Division, Korea Institute of Energy Research, 152, Gajeong-ro, Yuseong-gu, Daejeon 34129, Korea)

  • Evgueniy Entchev

    (Natural Resources Canada, Canada, CanmetENERGY, 1 Haanel Drive, Ottawa, ON K1A 1M1, Canada)

Abstract

A ground source heat pump system is a high-performance technology used for maintaining a stable underground temperature all year-round. However, the high costs for installation, such as for boring and drilling, is a drawback that prevents the system to be rapidly introduced into the market. This study proposes a modular ground heat exchanger (GHX) that can compensate for the disadvantages (such as high-boring/drilling costs) of the conventional vertical GHX. Through a real-scale experiment, a modular GHX was manufactured and buried at a depth of 4 m below ground level; the heat exchange rate and the change in underground temperatures during the GHX operation were tracked and calculated. The average heat exchanges rate was 78.98 W/m and 88.83 W/m during heating and cooling periods, respectively; the underground temperature decreased by 1.2 °C during heat extraction and increased by 4.4 °C during heat emission, with the heat pump (HP) working. The study showed that the modular GHX is a cost-effective alternative to the vertical GHX; further research is needed for application to actual small buildings.

Suggested Citation

  • Kwonye Kim & Jaemin Kim & Yujin Nam & Euyjoon Lee & Eunchul Kang & Evgueniy Entchev, 2021. "Analysis of Heat Exchange Rate for Low-Depth Modular Ground Heat Exchanger through Real-Scale Experiment," Energies, MDPI, vol. 14(7), pages 1-13, March.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:7:p:1893-:d:526255
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    References listed on IDEAS

    as
    1. Eloisa Di Sipio & David Bertermann, 2017. "Factors Influencing the Thermal Efficiency of Horizontal Ground Heat Exchangers," Energies, MDPI, vol. 10(11), pages 1-21, November.
    2. Florides, Georgios & Kalogirou, Soteris, 2007. "Ground heat exchangers—A review of systems, models and applications," Renewable Energy, Elsevier, vol. 32(15), pages 2461-2478.
    3. Jaemin Kim & Yujin Nam, 2020. "Development of the Performance Prediction Equation for a Modular Ground Heat Exchanger," Energies, MDPI, vol. 13(22), pages 1-13, November.
    4. Selamat, Salsuwanda & Miyara, Akio & Kariya, Keishi, 2016. "Numerical study of horizontal ground heat exchangers for design optimization," Renewable Energy, Elsevier, vol. 95(C), pages 561-573.
    5. Hongkyo Kim & Yujin Nam & Sangmu Bae & Jae Sang Choi & Sang Bum Kim, 2020. "A Study on the Effect of Performance Factor on GSHP System through Real-Scale Experiments in Korea," Energies, MDPI, vol. 13(3), pages 1-18, January.
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    Cited by:

    1. Kim, Yu Jin & Entchev, Evgeuniy & Na, Sun Ik & Kang, Eun Chul & Baik, Young-Jin & Lee, Euy Joon, 2023. "Investigation of system optimization and control logic on a solar geothermal hybrid heat pump system based on integral effect test data," Energy, Elsevier, vol. 284(C).
    2. Tomasz Janusz Teleszewski & Dorota Anna Krawczyk & Jose María Fernandez-Rodriguez & Angélica Lozano-Lunar & Antonio Rodero, 2022. "The Study of Soil Temperature Distribution for Very Low-Temperature Geothermal Energy Applications in Selected Locations of Temperate and Subtropical Climate," Energies, MDPI, vol. 15(9), pages 1-19, May.

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