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http://dx.doi.org/10.12652/Ksce.2012.32.5C.177

Thermal Conductivity Estimation of Soils Using Coil Shaped Ground Heat Exchanger  

Yoon, Seok (KAIST 건설및환경공학과)
Lee, Seung-Rae (KAIST 건설및환경공학과)
Park, Hyunku (KAIST 건설및환경공학과)
Park, Skhan (KAIST 건설및환경공학과)
Publication Information
KSCE Journal of Civil and Environmental Engineering Research / v.32, no.5C, 2012 , pp. 177-183 More about this Journal
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.
Keywords
thermal conductivity; thermal response test; spiral coil; ring coil model;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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