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The Effect of Groundwater Flow on the Thermal Performance of a Novel Borehole Heat Exchanger for Ground Source Heat Pump Systems: Small Scale Experiments and Numerical Simulation

Author

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  • Ahmed A. Serageldin

    (Environmental System Research Laboratory, Division of Human Environmental Systems, Hokkaido University, Sapporo 060-8628, Japan
    Mechanical Power Engineering Department, Faculty of Engineering at Shoubra, Benha University, Shoubra 11629, Egypt)

  • Ali Radwan

    (Environmental System Research Laboratory, Division of Human Environmental Systems, Hokkaido University, Sapporo 060-8628, Japan
    Mechanical Power Engineering Department, Faculty of Engineering, Mansoura University, El Mansoura 35516, Egypt)

  • Yoshitaka Sakata

    (Environmental System Research Laboratory, Division of Human Environmental Systems, Hokkaido University, Sapporo 060-8628, Japan)

  • Takao Katsura

    (Environmental System Research Laboratory, Division of Human Environmental Systems, Hokkaido University, Sapporo 060-8628, Japan)

  • Katsunori Nagano

    (Environmental System Research Laboratory, Division of Human Environmental Systems, Hokkaido University, Sapporo 060-8628, Japan)

Abstract

New small-scale experiments are carried out to study the effect of groundwater flow on the thermal performance of water ground heat exchangers for ground source heat pump systems. Four heat exchanger configurations are investigated; single U-tube with circular cross-section (SUC), single U-tube with an oval cross-section (SUO), single U-tube with circular cross-section and single spacer with circular cross-section (SUC + SSC) and single U-tube with an oval cross-section and single spacer with circular cross-section (SUO + SSC). The soil temperature distributions along the horizontal and vertical axis are measured and recorded simultaneously with measuring the electrical energy injected into the fluid, and the borehole wall temperature is measured as well; consequently, the borehole thermal resistance ( R b ) is calculated. Moreover, two dimensional and steady-state CFD simulations are validated against the experimental measurements at the groundwater velocity of 1000 m/year with an average error of 3%. Under saturated conditions without groundwater flow effect; using a spacer with SUC decreases the R b by 13% from 0.15 m·K/W to 0.13 m·K/W, also using a spacer with the SUO decreases the R b by 9% from 0.11 m·K/W to 0.1 m·K/W. In addition, the oval cross-section with spacer SUO + SSC decreases the R b by 33% compared with SUC. Under the effect of groundwater flow of 1000 m/year; R b of the SUC, SUO, SUC + SSC and SUO + SSC cases decrease by 15.5%, 12.3%, 6.1% and 4%, respectively, compared with the saturated condition.

Suggested Citation

  • Ahmed A. Serageldin & Ali Radwan & Yoshitaka Sakata & Takao Katsura & Katsunori Nagano, 2020. "The Effect of Groundwater Flow on the Thermal Performance of a Novel Borehole Heat Exchanger for Ground Source Heat Pump Systems: Small Scale Experiments and Numerical Simulation," Energies, MDPI, vol. 13(6), pages 1-26, March.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:6:p:1418-:d:334039
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    References listed on IDEAS

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    Cited by:

    1. 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.
    2. Hossein Javadi & Javier F. Urchueguia & Seyed Soheil Mousavi Ajarostaghi & Borja Badenes, 2020. "Numerical Study on the Thermal Performance of a Single U-Tube Borehole Heat Exchanger Using Nano-Enhanced Phase Change Materials," Energies, MDPI, vol. 13(19), pages 1-30, October.
    3. Joanna Piotrowska-Woroniak, 2021. "Assessment of Ground Regeneration around Borehole Heat Exchangers between Heating Seasons in Cold Climates: A Case Study in Bialystok (NE, Poland)," Energies, MDPI, vol. 14(16), pages 1-32, August.
    4. Radwan A. Almasri & Nidal H. Abu-Hamdeh & Abdullah Alajlan & Yazeed Alresheedi, 2022. "Utilizing a Domestic Water Tank to Make the Air Conditioning System in Residential Buildings More Sustainable in Hot Regions," Sustainability, MDPI, vol. 14(22), pages 1-19, November.
    5. Joanna Piotrowska-Woroniak, 2021. "Determination of the Selected Wells Operational Power with Borehole Heat Exchangers Operating in Real Conditions, Based on Experimental Tests," Energies, MDPI, vol. 14(9), pages 1-21, April.
    6. Aminhossein Jahanbin & Giovanni Semprini & Andrea Natale Impiombato & Cesare Biserni & Eugenia Rossi di Schio, 2020. "Effects of the Circuit Arrangement on the Thermal Performance of Double U-Tube Ground Heat Exchangers," Energies, MDPI, vol. 13(12), pages 1-19, June.

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