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Numerical Analysis of the Factors Influencing a Vertical U-Tube Ground Heat Exchanger

Author

Listed:
  • Shangyuan Chen

    (Institute of Military Environmental Teaching and Research, PLA University of Science and Technology, Nanjing 210007, China)

  • Jinfeng Mao

    (Institute of Military Environmental Teaching and Research, PLA University of Science and Technology, Nanjing 210007, China)

  • Xu Han

    (Institute of Military Environmental Teaching and Research, PLA University of Science and Technology, Nanjing 210007, China)

  • Chaofeng Li

    (Institute of Military Environmental Teaching and Research, PLA University of Science and Technology, Nanjing 210007, China)

  • Liyao Liu

    (Institute of Military Environmental Teaching and Research, PLA University of Science and Technology, Nanjing 210007, China)

Abstract

The development of a three-dimensional, unsteady state model, which couples heat transfer with groundwater seepage for a vertical U-tube ground heat exchanger (GHE) is presented. The influence of underground soil thermal properties, grout materials, inlet water temperature and velocity, and groundwater seepage on heat transfer in the GHE is examined. The results indicate that before the heat in the borehole is saturated, the heat flux in the GHE is directly proportional to the thermal conductivity coefficient of the grout materials. The radius of the thermal effect of the GHE and the recovery rate of the temperature in the soil are also proportional to the thermal diffusion coefficient of the soil. In cooling mode, the increase of the inlet water temperature of the GHE results in enhanced heat transfer. However, this may cause issues with heat buildup. The increase of the inlet water velocity in the GHE enhances heat convection in the tube. The effect of thermal-seepage coupling in groundwater can reduce the accumulated heat, thus resulting in the effective enhancement of the heat transfer in the GHE.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jsusta:v:8:y:2016:i:9:p:882-:d:77240
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    References listed on IDEAS

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    2. Daehoon Kim & Seokhoon Oh, 2018. "Optimizing the Design of a Vertical Ground Heat Exchanger: Measurement of the Thermal Properties of Bentonite-Based Grout and Numerical Analysis," Sustainability, MDPI, vol. 10(8), pages 1-15, July.
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