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Geomechanics and Engineering
  Volume 6, Number 1, January 2014, pages 79-98

Thermal transfer behavior in two types of W-shape ground heat exchangers installed in multilayer soils
Seok Yoon, Seung-Rae Lee, Gyu-Hyun Go, Jianfeng Xue, Hyunku Park and Dowon Park

    This paper presents an experimental and numerical study on the evaluation of a thermal response test using a precast high-strength concrete (PHC) energy pile and a closed vertical system with W-type ground heat exchangers (GHEs). Field thermal response tests (TRTs) were conducted on a PHC energy pile and on a general vertical GHE installed in a multiple layered soil ground. The equivalent ground thermal conductivity was determined by using the results from TRTs. A simple analytical solution is suggested in this research to derive an equivalent ground thermal conductivity of the multilayered soils for vertically buried GHEs. The PHC energy pile and general vertical system were numerically modeled using a three dimensional finite element method to compare the results with TRTs'. Borehole thermal resistance values were also obtained from the numerical results, and they were compared with various analytical solutions. Additionally, the effect of ground thermal conductivity on the borehole thermal resistance was analyzed.
Key Words
    ground thermal conductivity; borehole thermal resistance; ground heat exchanger; thermal response test; numerical analysis
(1) Seok Yoon, Seung-Rae Lee, Gyu-Hyun Go and Dowon Park:
Department of Civil and Environmental Engineering, Korean Advanced Institute for Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea;
(2) Jianfeng Xue:
School of Applied Science and Engineering, Monash University, Churchill, Vic, 3842, Australia;
(3) Hyunku Park:
Division of Civil Engineering, Samsung C&T, Seoul 137-858, Republic of Korea.

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