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임효재(Hyo Jae Lim),정계훈(Kye Hoon Jung),한지원(Ji Won Han),박경우(Kyung Woo Park) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
This study was performed to acquire the reliable in-situ thermal conductivity of closed type ground heat exchanger used in ground source heat pump. We selected four sites(Cheonan, Daejeon, Daegu, Gwangju) which are central area of South Korea. Test results show that the effective thermal conductivities are 2.33 W/m℃, 2.50 W/m℃, 2.75 W/m℃ and 2.86 W/m℃. From this data, we can see that thermal conductivity varies about the range of 23% with the sites. Also, thermal conductivity increases up to 20% by changing grouting material from low salica sand to high one.
임효재(Lim, Hyo-Jae),손병후(Shon, Byong-Hu),정계훈(Jung, Kye-Hoon) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.11
This study was performed to construct a geothermal data base about thermal conductivity of ground heat exchanger and thermal properties of grouting material which used to refill the borehole. We have acquired geothermal data sets from 39 sites over wide area of South Korea except to Jeju island. From data analysis, the range of thermal conductivity is 1.5{sim}4.0 W/mK. It means that thermal conductivity varies with grouting material as well as regional geology and ground water system.