Journal of the Korean Solar Energy Society (한국태양에너지학회 논문집)

The Korean Solar Energy Society (한국태양에너지학회)
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Thermal Conductive Characteristics and Basic Properties of Bentonite Grouts for the Ground Heat Exchanger of Geo-source Heat Pump

지열히트펌프 지중열교환기용 벤토나이트계 그라우트재의 열전도특성 및 기본성능

  • Bai, Kang (Energy Materials and Convergence Research Department, Korea Institute of Energy Research)
  • 배강 (한국에너지기술연구원 에너지융합소재연구센터)
  • Received : 2012.11.01
  • Accepted : 2012.12.26
  • Published : 2013.02.28
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Abstract

In this study, the thermal conductive characteristics and basic properties of the nine commercial products of bentonite grouts were studied. Six of the nine products for ground heat exchanger systems are imported and others for civil engineering are domestic. The thermal conductivities of all bentonite products are nearly similar among products. The free swell indexes, viscosities and filter losses of the ground heat exchanger grouts are lower than those of the civil engineering ones. These characteristics seem to increase of the fluidity to fill the bentonite slurry to bore-hall perfectly, rather than to prevent underground water penetration. Thus, the mixtures of bentonites and sands are recommended for high thermal conduction grouts.

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References

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