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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Thermal Conductivity Estimate of Ground Using Energy Piles

PHC 에너지 파일을 이용한 지반의 열전도도 산정

  • Yoon, Seok (Department of Civil and Environmental Engineering, KAIST) ;
  • Go, Gyu-Hyun (Department of Civil and Environmental Engineering, KAIST) ;
  • Park, Hyun-Ku (Department of Civil and Environmental Engineering, KAIST) ;
  • Park, Skhan (Department of Civil and Environmental Engineering, KAIST) ;
  • Lee, Seung-Rae (Department of Civil and Environmental Engineering, KAIST) ;
  • Cho, Kyung-Jin (Daelim Technology Research Institute, Daelim Industrial Co.) ;
  • Song, Chi-Yong (Daelim Technology Research Institute, Daelim Industrial Co.)
  • 윤석 (KAIST 건설및환경공학과 대학원) ;
  • 고규현 (KAIST 건설및환경공학과 대학원) ;
  • 박현구 (KAIST 건설및환경공학과 대학원) ;
  • 박스칸 (KAIST 건설및환경공학과 대학원) ;
  • 이승래 (KAIST 건설및환경공학과 대학원) ;
  • 조경진 (대림산업 기술연구소) ;
  • 송치용 (대림산업 기술연구소)
  • Received : 2012.09.14
  • Accepted : 2012.10.31
  • Published : 2012.12.01
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Abstract

The use of energy pile foundation has been increased for economic utilization of geothermal energy. This paper describes an experimental and numerical study on thermal response tests (TRTs) using W and 3U-shaped ground heat exchangers (GHEs) in precast-high strength concrete (PHC) energy piles. Ground thermal conductivity and borehole thermal resistance were measured and compared with those numerical analysis. W-shpaed GHE showed higher heat transfer behavior than 3U-shaped one because of different conditions such as pile size and volume of grout. That is, ground thermal conductivity using W-shaped GHE was higher than that of 3U shaped GHE, and borehole thermal resistance vice versa. The relative error of borehole resistance values between numerical and analytical solution was less than 5%.

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