Journal of the Korean Society for Geothermal and Hydrothermal Energy (한국지열·수열에너지학회논문집)

Korean Society for Geothermal and Hydrothermal Energy (한국지열·수열에너지학회)
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Evaluation on in-situ Thermal Performance of Coaxial-type Ground Heat Exchanger with Different Configurations

이중관형 지중열교환기 구성에 따른 현장 열성능 평가

  • Lee, Seokjae (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Jung, Hyun-seok (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Oh, Kwanggeun (Daelim Industrial Co., Ltd, Se) ;
  • Park, Sangwoo (Department of Civil Engineering and Environment, Korea military academy) ;
  • Choi, Hangseok (School of Civil, Environmental and Architectural Engineering, Korea University)
  • 이석재 (고려대학교 건축사회환경공학부) ;
  • 정현석 (고려대학교 건축사회환경공학부) ;
  • 오광근 (대림산업 건설사업부) ;
  • 박상우 (육군사관학교 토목환경과) ;
  • 최항석 (고려대학교 건축사회환경공학부)
  • Received : 2019.08.26
  • Accepted : 2019.11.05
  • Published : 2019.12.01
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Abstract

In order to design coaxial-type Ground Heat Exchangers (GHEXs) efficiently, the effect of components (i.e, heat exchange pipe and grouting material) on the thermal performance of coaxial-type GHEXs should be identified in advance. In this paper, three coaxial-type GHEXs with different configurations were constructed in a test bed. Then, the effect of heat exchange pipes and grouting materials on the thermal performance of coaxial-type GHEXs was investigated by performing in-situ thermal response tests (TRTs) and thermal performance tests (TPTs). In the TRTs, the effective thermal conductivities of the coaxial-type GHEXs with concrete grouting and STS pipes were improved by 6.15 and 22.7%, respectively compared to those of bentonite grouting and HDPE pipes. Additionally, in the TPTs, the use of concrete grouting and STS pipes in the coaxial-type GHEXs enhanced the in-situ thermal performance by 15 and 33.8%, respectively.

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References

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