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Thermal Conductivity Estimate of Ground Using Energy Piles  

Yoon, Seok (Department of Civil and Environmental Engineering, KAIST)
Go, Gyu-Hyun (Department of Civil and Environmental Engineering, KAIST)
Park, Hyun-Ku (Department of Civil and Environmental Engineering, KAIST)
Park, Skhan (Department of Civil and Environmental Engineering, KAIST)
Lee, Seung-Rae (Department of Civil and Environmental Engineering, KAIST)
Cho, Kyung-Jin (Daelim Technology Research Institute, Daelim Industrial Co.)
Song, Chi-Yong (Daelim Technology Research Institute, Daelim Industrial Co.)
Publication Information
Journal of the Korean Society for Geothermal and Hydrothermal Energy / v.8, no.4, 2012 , pp. 8-16 More about this Journal
Abstract
The use of energy pile foundation has been increased for economic utilization of geothermal energy. This paper describes an experimental and numerical study on thermal response tests (TRTs) using W and 3U-shaped ground heat exchangers (GHEs) in precast-high strength concrete (PHC) energy piles. Ground thermal conductivity and borehole thermal resistance were measured and compared with those numerical analysis. W-shpaed GHE showed higher heat transfer behavior than 3U-shaped one because of different conditions such as pile size and volume of grout. That is, ground thermal conductivity using W-shaped GHE was higher than that of 3U shaped GHE, and borehole thermal resistance vice versa. The relative error of borehole resistance values between numerical and analytical solution was less than 5%.
Keywords
Thermal conductivity; Energy pile; Thermal response test; Thermal resistance;
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