한국신재생에너지학회:학술대회논문집
- 한국신재생에너지학회 2007년도 추계학술대회 논문집
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- Pages.529-532
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- 2007
수직 밀페형 지증 열교환기용 뒤채움재의 열전도 및 점도특성 연구
Experimental Study on Thermal Conductivity and Viscosity of Grouts for Backfilling Ground Heat Exchanger
초록
In order to characterize the thermal conductivity and viscosity of grout materials used for backfilling ground heat exchangers, nine bentonite grouts and cement grouts being adapted in the United State have been considered in this study. The bentonite grouts indicate that the thermal conductivity and viscosity increase with the content of bentonite or filler (silica sand). In addition, material segregation can be observed when the viscosity of grout is relatively low. The saturated cement grouts appear to possess much higher thermal conductivity than the saturated bentonite grouts, and the reduction of thermal conductivity in the cement grouts after drying specimens is less than in case of the bentonite grouts. Maintaining the moisture content of grouts is a crucial factor in enhancing the efficiency of ground heat exchangers.