Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
권호 표지

Thermal Conductivity Measurement of Grouting Materials for Geothermal Heat Exchanger

그라우트 재료에 따른 지중 열교환기의 열전도도에 관한 실험적 연구

  • Lim Hyo Jae (Department of Mechanical Engineering, Hoseo University) ;
  • Kong Hyoung Jin (Graduate School, Department of Mechanical Engineering, Hoseo University) ;
  • Song Yoon Seok (Graduate School, Department of Mechanical Engineering, Hoseo University) ;
  • Park Seong Koo (Geotech Inc.)
  • 임효재 (호서대학교 기계공학과) ;
  • 공형진 (호서대학교 대학원 기계공학과) ;
  • 송윤석 (호서대학교 대학원 기계공학과) ;
  • 박성구 ((주)지오테크)
  • Published : 2005.04.01
Download PDF
⟨ Previous Next ⟩

Abstract

An experimental study was conducted on the thermal conductivity of various grouting materials for geothermal heat exchanger which is used as a heat sink or source in the heat pump system. The grouting of the vertical heat exchanger is important for environmental and heat transfer reasons and is generally accomplished by the placement of a low permeability material into the annular space between the borehole wall and the pipes suspended in the borehole. In this study, a lab scale test apparatus was made and measured the thermal conductivity of four grouting materials. As a result, the temperature rising tendency was similar among them, but the increasing rate was different. Thus the thermal conductivity showed a maximum difference of $27\%$ among grouting materials.

Keywords

References

  1. Yavuzturk, C., 1999, Modeling of vertical ground loop heat exchangers for ground source heat pump systems, Ph.D. thesis, Oklahoma State University, Stillwater, OK, U.S.A
  2. Austin, W. A. Ill, 1998, Development of an in-situ system for measuring ground thermal properties, MS thesis, Oklahoma State University, Stillwater, OK, U.S.A
  3. Yavuzturk, C. and Spitler, J. D., 1999, A short time step response factor model for vertical ground loop heat exchangers, ASHRAE Transactions, Vol. 105, Part 2, pp. 540-550
  4. Hiller, C., 2000, Grouting for vertical geothermal heat pump systems, 1st ed., IGSHPA, Oklahoma State University, pp.25-43
  5. Kavanaugh, S. P. and Rafferty, K., 1997, Ground source heat pumps - Design of geothermal systems for commercial and institutional buildings, Proceedings of the ASHRAE, Atlanta Georgia, pp.22-34