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Use of a Pre-Drilled Hole for Implementing Thermal Needle Probe Method for Soils and Rocks

Author

Listed:
  • So-Jung Lee

    (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea)

  • Jung-Chan Choi

    (Norwegian Geotechnical Institute (NGI), Oslo N-0806, Norway)

  • Seunghun Baek

    (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea)

  • Tae-Hyuk Kwon

    (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea)

  • Hee-Hwan Ryu

    (Power Transmission Laboratory, Korea Electric Power Research Institute, Daejeon 34056, Korea)

  • Ki-Il Song

    (Department of Civil Engineering, Inha University, Incheon 22212, Korea)

Abstract

The thermal needle probe method, which is widely used for measuring the thermal conductivity λ of soils, deploys a long and thin metallic probe that houses a line heater and a temperature sensor. However, inserting such probes into consolidated or densely compacted soils or rocks is difficult, frequently causing buckling of the probe and severe disturbance to the surrounding ground, leading to unreliable measurements. We found that the use of a pre-drilled hole filled with thermally conductive grease for installing a thermal needle probe was feasible to overcome such challenges, and still yielded reliable measurements of thermal conductivity. The proposed method, i.e., the pre-drilling thermal needle probe method, was verified by finite element calculations and laboratory experiments by varying various parameters, such as the pre-drilled hole diameter, probe diameter, and thermal conductivity of thermal grease. It was observed that increases in the pre-drilled hole diameter and probe diameter and a decrease in the thermal conductivity of the thermal grease caused delays in temperature increase owing to the slowed heat transfer. Nevertheless, all the estimated λ values agreed well with the reference λ values with acceptable errors. Thus, the proposed method yields reliable measurements and can be applied for a wide range of soils from compacted soils to hard rocks.

Suggested Citation

  • So-Jung Lee & Jung-Chan Choi & Seunghun Baek & Tae-Hyuk Kwon & Hee-Hwan Ryu & Ki-Il Song, 2016. "Use of a Pre-Drilled Hole for Implementing Thermal Needle Probe Method for Soils and Rocks," Energies, MDPI, vol. 9(10), pages 1-10, October.
    • Handle: RePEc:gam:jeners:v:9:y:2016:i:10:p:846-:d:80971
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    References listed on IDEAS

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    1. 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.
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