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Evaluation of heat exchange rate of GHE in geothermal heat pump systems

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  • Jun, Liu
  • Xu, Zhang
  • Jun, Gao
  • Jie, Yang

Abstract

Total thermal resistance of ground heat exchanger (GHE) is comprised of that of the soil and inside the borehole. The thermal resistance of soil can be calculated using the linear source theory and cylindrical source theory, while that inside the borehole is more complicated due to the integrated resistance of fluid convection, and the conduction through pipe and grout. Present study evaluates heat exchange rate per depth of GHE by calculating the total thermal resistance, and compares different methods to analyze their similarities and differences for engineering applications. The effects of seven separate factors, running time, shank spacing, depth of borehole, velocity in the pipe, thermal conductivity of grout, inlet temperature and soil type, on the thermal resistance and heat exchange rate are analyzed. Experimental data from several real geothermal heat pump (GHP) applications in Shanghai are used to validate the present calculations. The observations from this study are to provide some guidelines for the design of GHE in GHP systems.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:renene:v:34:y:2009:i:12:p:2898-2904
    DOI: 10.1016/j.renene.2009.04.009
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    1. Koohi-Fayegh, Seama & Rosen, Marc A., 2012. "Examination of thermal interaction of multiple vertical ground heat exchangers," Applied Energy, Elsevier, vol. 97(C), pages 962-969.
    2. Yoon, Seok & Lee, Seung-Rae & Go, Gyu-Hyun, 2014. "A numerical and experimental approach to the estimation of borehole thermal resistance in ground heat exchangers," Energy, Elsevier, vol. 71(C), pages 547-555.
    3. Tsubaki, Koutaro & Mitsutake, Yuichi, 2016. "Performance of ground-source heat exchangers using short residential foundation piles," Energy, Elsevier, vol. 104(C), pages 229-236.
    4. Akbari Garakani, Amir & Mokhtari Jozani, Sahar & Hashemi Tari, Pooyan & Heidari, Bahareh, 2022. "Effects of heat exchange fluid characteristics and pipe configuration on the ultimate bearing capacity of energy piles," Energy, Elsevier, vol. 248(C).
    5. Karytsas, Spyridon & Choropanitis, Ioannis, 2017. "Barriers against and actions towards renewable energy technologies diffusion: A Principal Component Analysis for residential ground source heat pump (GSHP) systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 78(C), pages 252-271.
    6. Han, Chanjuan & Yu, Xiong (Bill), 2016. "Sensitivity analysis of a vertical geothermal heat pump system," Applied Energy, Elsevier, vol. 170(C), pages 148-160.
    7. Yoon, Seok & Lee, Seung-Rae & Kim, Min-Jun & Kim, Woo-Jin & Kim, Geon-Young & Kim, Kyungsu, 2016. "Evaluation of stainless steel pipe performance as a ground heat exchanger in ground-source heat-pump system," Energy, Elsevier, vol. 113(C), pages 328-337.
    8. Carotenuto, Alberto & Ciccolella, Michela & Massarotti, Nicola & Mauro, Alessandro, 2016. "Models for thermo-fluid dynamic phenomena in low enthalpy geothermal energy systems: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 60(C), pages 330-355.
    9. Han, Chanjuan & Yu, Xiong (Bill), 2016. "Performance of a residential ground source heat pump system in sedimentary rock formation," Applied Energy, Elsevier, vol. 164(C), pages 89-98.
    10. Casasso, Alessandro & Sethi, Rajandrea, 2014. "Efficiency of closed loop geothermal heat pumps: A sensitivity analysis," Renewable Energy, Elsevier, vol. 62(C), pages 737-746.
    11. 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.
    12. Seama Koohi-Fayegh & Marc A. Rosen, 2012. "On Thermally Interacting Multiple Boreholes with Variable Heating Strength: Comparison between Analytical and Numerical Approaches," Sustainability, MDPI, vol. 4(8), pages 1-19, August.
    13. Tomislav Kurevija & Marija Macenić & Martina Tuschl, 2023. "Drilling Deeper in Shallow Geoexchange Heat Pump Systems—Thermogeological, Energy and Hydraulic Benefits and Restraints," Energies, MDPI, vol. 16(18), pages 1-17, September.
    14. Chua, K.J. & Chou, S.K. & Yang, W.M., 2010. "Advances in heat pump systems: A review," Applied Energy, Elsevier, vol. 87(12), pages 3611-3624, December.
    15. 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.
    16. Seama Koohi-Fayegh & Marc A. Rosen, 2013. "A Review of the Modelling of Thermally Interacting Multiple Boreholes," Sustainability, MDPI, vol. 5(6), pages 1-18, June.
    17. Luca Alberti & Adriana Angelotti & Matteo Antelmi & Ivana La Licata, 2017. "A Numerical Study on the Impact of Grouting Material on Borehole Heat Exchangers Performance in Aquifers," Energies, MDPI, vol. 10(5), pages 1-15, May.
    18. Khaled Salhein & C. J. Kobus & Mohamed Zohdy, 2022. "Control of Heat Transfer in a Vertical Ground Heat Exchanger for a Geothermal Heat Pump System," Energies, MDPI, vol. 15(14), pages 1-24, July.
    19. Hossein Javadi & Seyed Soheil Mousavi Ajarostaghi & Marc A. Rosen & Mohsen Pourfallah, 2018. "A Comprehensive Review of Backfill Materials and Their Effects on Ground Heat Exchanger Performance," Sustainability, MDPI, vol. 10(12), pages 1-22, November.

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