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Development of a Low-Depth Modular GHX through a Real-Scale Experiment

Author

Listed:
  • Kwonye Kim

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

  • Sangmu Bae

    (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 (KIER), 152, Gajeong-ro, Yuseong-gu, Daejeon 34129, Korea)

  • Evgueniy Entchev

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

Abstract

The global energy sector is aiming to rapidly transform energy systems into those less dependent on fossil fuels to reduce their harmful effects on the climate. Although ground source heat pump (GSHP) systems are more efficient than conventional air-source heat pump (ASHP) systems, the high initial investment cost, particularly for a vertical closed-loop type ground heat exchanger (GHX), makes it difficult to incorporate them into small buildings. This paper proposes a low-depth modular GHX for reducing cost and improving the workability of GSHPs. A modular GHX is a cubical structure comprising tubes and buried using an excavator at a depth 4 m below the ground surface. This GHX is manufactured at a factory, carried by a small truck, and then installed by a small lift or a backhoe such that it can be installed in small buildings or narrow spaces at low depths underground. In this research, the performance and feasibility analyses of modular and vertical GHXs were conducted via a real-scale experiment. The results demonstrate that the modular GHX influences the workability of GSHPs by 91% during the heating period and 70% during the cooling period. In contrast to the conventional HVAC, the modular and vertical GHXs could recover the initial investment costs in 4 years and 10 years, respectively.

Suggested Citation

  • Kwonye Kim & Sangmu Bae & Yujin Nam & Euyjoon Lee & Evgueniy Entchev, 2022. "Development of a Low-Depth Modular GHX through a Real-Scale Experiment," Energies, MDPI, vol. 15(3), pages 1-14, January.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:3:p:698-:d:727799
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    References listed on IDEAS

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    1. Adel Eswiasi & Phalguni Mukhopadhyaya, 2021. "Performance of Conventional and Innovative Single U-Tube Pipe Configuration in Vertical Ground Heat Exchanger (VGHE)," Sustainability, MDPI, vol. 13(11), pages 1-15, June.
    2. Cristina Piselli & Alessio Guastaveglia & Jessica Romanelli & Franco Cotana & Anna Laura Pisello, 2020. "Facility Energy Management Application of HBIM for Historical Low-Carbon Communities: Design, Modelling and Operation Control of Geothermal Energy Retrofit in a Real Italian Case Study," Energies, MDPI, vol. 13(23), pages 1-18, December.
    3. Shangyuan Chen & Jinfeng Mao & Xu Han & Chaofeng Li & Liyao Liu, 2016. "Numerical Analysis of the Factors Influencing a Vertical U-Tube Ground Heat Exchanger," Sustainability, MDPI, vol. 8(9), pages 1-12, September.
    4. 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).

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