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http://dx.doi.org/10.9720/kseg.2013.4.389

Thermal Conductivity from an in-situ Thermal Response Test Compared with Soil and Rock Specimens under Groundwater-bearing Conditions  

Kim, Jin-Sung (Rural Research Institute, Korea Rural Community Corporation)
Song, Sung-Ho (Rural Research Institute, Korea Rural Community Corporation)
Jeong, Gyo-Cheol (Dept. of Earth and Environmental Sciences, Andong National University)
Publication Information
The Journal of Engineering Geology / v.23, no.4, 2013 , pp. 389-398 More about this Journal
Abstract
Studies of the thermal properties of various rock types obtained from several locations in Korea have revealed significant differences in thermal conductivities in the thermal response test (TRT), which has been applied to the design of a ground-source heat pump system. In the present study, we aimed to compare the thermal conductivities of the samples with those obtained by TRT. The thermal conductivities of soil and rock samples were 1.32W/m-K and 2.88 W/m-K, respectively. In comparison, the measured TRT value for thermal conductivity was 3.13W/m-K, which is 10% higher than that of the rock samples. We consider that this difference may be due to groundwater flow because abundant groundwater is present in the study area and has a hydraulic conductivity of 0.01. It is natural to consider that the object of TRT is to calculate the original thermal conductivity of the ground, following the line source theory. Therefore, we conclude that the TRT applied to a domestic standing column type well is not suitable for a line source theory. To solve these problems, values of thermal conductivity measured directly from samples should be used in the design of ground-source heat pump systems.
Keywords
geothermal energy; ground-source heat pump system; thermal conductivity; thermal response test; SCW type; groundwater;
Citations & Related Records
Times Cited By KSCI : 9  (Citation Analysis)
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