| Title |
Thermal Conductivity Estimation of Soils Using Coil Shaped Ground Heat Exchanger |
| Authors |
윤석(Yoon, Seok) ; 이승래(Lee, Seung-Rae) ; 박현구(Park, Hyunku) ; 박스칸(Park, Skhan) |
| DOI |
https://doi.org/10.12652/Ksce.2012.32.5C.177 |
| Keywords |
열전도도;열응답 시험;스파이럴 코일;고리-코일 열원 모델 thermal conductivity;thermal response test;spiral coil;ring coil model |
| Abstract |
The use of energy pile foundation has been increased for economic utilization of geothermal energy. In particular, a coil-shaped ground heat exchanger (GHE) is preferred than conventional U-shaped heat exchanger to ensure better efficiency of heat exchange rate. This paper presents experimental results by changing different pitch spaces of spiral coils. Joomunjin sand was filled in a steel box of which the size was $5m{\times}1m{\times}1m$. Thermal response tests (TRTs) were conducted to measure the ground thermal conductivity with temperatures of circulating water using line source model and ring coil model. Experimental results and analytical solutions were compared to validate the applicability of these models. Ring coil model showed more accurate similar results with experimental data rather than line source model and cylindrical source model. |