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Feasibility Study of Ground Source Heat Pump System Considering Underground Thermal Properties

Author

Listed:
  • Sang Mu 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)

  • Byoung Ohan Shim

    (KIGAM, Gwahang-no 124, Yuseong-gu, Daejeon 305-350, Korea)

Abstract

: A typical ground source heat pump (GSHP) system in South Korea has a ground heat exchanger (GHX) with a length of 100–150 m, which utilizes annually stable underground temperature to meet the loads of cooling, heating and hot water in buildings. However, most GSHP systems have been introduced in heating dominated areas because the system performance advantage is larger compared with air source heat pump system than that in cooling dominated areas. To effectively provide geothermal energy to the building in the limited urban area, it is necessary to install deep GHXs. Despite its large capacity, there are few studies on GSHP system with deep GHX over 300 m. In this study, to estimate the performance of the GSHP system with deep GHX and evaluate its feasibility, numerical simulation was conducted. To quantitatively analyze heat transfer between soil and GHX, the coupled model with GHX model and ground heat and groundwater transfer model was used. Furthermore, the heat exchange rate and the source temperature were calculated according to the operation modes, the length of GHX, and soil conditions such as geothermal gradient and thermal conductivity. As a result, the total heat exchange rate of GHX with a length of 300 m heat exchanger was 12.62 kW, 173% that of a length of 150 m. Finally, it was found that the GSHP system with deep GHX has realistic possibility in good condition of geothermal gradient.

Suggested Citation

  • Sang Mu Bae & Yujin Nam & Byoung Ohan Shim, 2018. "Feasibility Study of Ground Source Heat Pump System Considering Underground Thermal Properties," Energies, MDPI, vol. 11(7), pages 1-20, July.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:7:p:1786-:d:156801
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    References listed on IDEAS

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    1. Michopoulos, [alpha]. & [Kappa]yriakis, [Nu]., 2009. "Predicting the fluid temperature at the exit of the vertical ground heat exchangers," Applied Energy, Elsevier, vol. 86(10), pages 2065-2070, October.
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    Cited by:

    1. Borja Badenes & Miguel Ángel Mateo Pla & Teresa Magraner & Javier Soriano & Javier F. Urchueguía, 2020. "Theoretical and Experimental Cost–Benefit Assessment of Borehole Heat Exchangers (BHEs) According to Working Fluid Flow Rate," Energies, MDPI, vol. 13(18), pages 1-29, September.
    2. Gaurav Shrestha & Mayumi Yoshioka & Hikari Fujii & Youhei Uchida, 2020. "Evaluation of Suitable Areas to Introduce a Closed-Loop Ground Source Heat Pump System in the Case of a Standard Japanese Detached Residence," Energies, MDPI, vol. 13(17), pages 1-15, August.
    3. Alshehri, Faisal & Beck, Stephen & Ingham, Derek & Ma, Lin & Pourkashanian, Mohammed, 2021. "Sensitivity analysis of a vertical geothermal heat pump system in a hot dry climate," Renewable Energy, Elsevier, vol. 178(C), pages 785-801.
    4. Elżbieta Hałaj & Leszek Pająk & Bartosz Papiernik, 2020. "Finite Element Modeling of Geothermal Source of Heat Pump in Long-Term Operation," Energies, MDPI, vol. 13(6), pages 1-18, March.
    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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