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수직 밀페형 지증 열교환기용 뒤채움재의 열전도 및 점도특성 연구
최항석(Choi, Hang-Seok),이철호(Lee, Chul-Ho),길후정(Gil, Hu-Jeong),최효범(Choi, Hyo-Pum),우상백(Woo, Sang-Baik) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.11
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.
수직 밀폐형 자중 열교환기용 뒤채움재의 열전도 및 점도특성 연구
최항석(Choi, Hang-Seok),이철호(Lee, Chul-Ho),길후정(Gil, Hu-Jeong),최효범(Choi, Hyo-Pum),우상백(Woo, Sang-Baik) 한국신재생에너지학회 2007 신재생에너지 Vol.3 No.4
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 the case of the bentonite grouts. Maintaining the moisture content of grouts is a crucial factor in enhancing the efficiency of ground heat exchangers.
흑연(Graphite) 첨가를 통한 수직 밀폐형 지중열교환기 뒤채움재의 열전도 특성 향상 연구
이강자(Lee, Kang-Ja),길후정(Gil, Hu-Jeong),이철호(Lee, Chul-Ho),최항석(Choi, Hang-Seok),최효범(Choi, Hyo-Pum) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
The thermal conductivity and viscosity(or workability) of graphite-added bentonite grouts and cementitious grouts have been evaluated and compared to determine the suitability of these materials for backfilling vertical boreholes of ground heat exchangers. Seven bentonite grouts from different product sources and a portland cement grout with various mixture ratios were considered in this paper. As a new additive for grout, we choose graphite which has high thermal conductivity. The bentonite grouts indicate that the thermal conductivity and viscosity increase with the content of bentonite or with an addition of Graphite compared with that of silica sand. In case of cementitious grout also increase the thermal conductivity and decrease the workability dramatically though an addition of Graphite. Therefore, we cautiously select the amount of graphite and mixture ratio of bentonite and cement considering not only thermal conductivity but also viscosity for the optimum condition of backfilling material.