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An Overview of Sandbox Experiment on Ground Heat Exchangers

Author

Listed:
  • Sihan Zhou

    (School of Civil Engineering, Sun Yat-sen University, Zhuhai 519082, China)

  • Lijie Zhu

    (School of Civil Engineering, Sun Yat-sen University, Zhuhai 519082, China)

  • Runan Wan

    (School of Civil Engineering, Sun Yat-sen University, Zhuhai 519082, China)

  • Tao Zhang

    (School of Civil Engineering, Sun Yat-sen University, Zhuhai 519082, China)

  • Yongzheng Zhang

    (School of Civil Engineering, Sun Yat-sen University, Zhuhai 519082, China)

  • Yi Zhan

    (School of Civil Engineering, Sun Yat-sen University, Zhuhai 519082, China)

  • Fang Wang

    (School of Civil Engineering, Sun Yat-sen University, Zhuhai 519082, China)

  • Linfeng Zhang

    (School of Transportation, Southeast University, Nanjing 211189, China)

  • Tian You

    (School of Civil Engineering, Sun Yat-sen University, Zhuhai 519082, China)

Abstract

As an energy-efficient and low-carbon technology, ground-source heat pumps are promising to contribute to carbon neutrality in the building sector. A crucial component of these systems is the ground heat exchanger, which has been extensively studied through sandbox experiments. These experiments play a vital role in understanding heat transfer characteristics and validating simulation results. In order to facilitate the improvement of ground heat exchangers and the development of ground-source heat-pump systems, this article provides a comprehensive summary of existing sandbox experiments. The borehole sandbox experiments are classified into the single borehole experiment, borehole group experiment, seepage experiment, and multi-layer soil experiment. It was observed that the heat transfer efficiency of a single spiral tube is only 80% compared to that of a double spiral tube. Moving on to energy-pile sandbox experiments, they are further divided into mechanical performance, thermal performance, and thermal-mechanical coupled performance tests. It was revealed that the heat transfer distance of a single U-shaped energy pile in the radial direction is three times greater than in the vertical direction. For the mentioned sandbox experiments, the sandbox design, experiment conduction, testing conditions, and result analyses are summarized. To improve the sandbox experiments, there are still some difficulties in building a similarity experiment, testing the temperatures in a small error, controlling the boundary conditions accurately, and testing the thermophysical properties of soil accurately. Furthermore, the perspectives of sandbox experiments of ground heat exchangers are also proposed. The sandbox experiments under complex environment conditions or with novel composite energy geo-structures or ground heat exchangers with new materials and new technologies would be further investigated. By addressing these aspects, this review aims to provide guidelines for the design, construction, operation, and optimization of sandbox experiments for different ground heat exchangers, ultimately promoting the wider adoption of ground-source heat pumps in achieving carbon neutrality.

Suggested Citation

  • Sihan Zhou & Lijie Zhu & Runan Wan & Tao Zhang & Yongzheng Zhang & Yi Zhan & Fang Wang & Linfeng Zhang & Tian You, 2023. "An Overview of Sandbox Experiment on Ground Heat Exchangers," Sustainability, MDPI, vol. 15(14), pages 1-39, July.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:14:p:11095-:d:1195191
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    References listed on IDEAS

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