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http://dx.doi.org/10.17664/ksgee.2019.15.4.008

Evaluation on in-situ Thermal Performance of Coaxial-type Ground Heat Exchanger with Different Configurations  

Lee, Seokjae (School of Civil, Environmental and Architectural Engineering, Korea University)
Jung, Hyun-seok (School of Civil, Environmental and Architectural Engineering, Korea University)
Oh, Kwanggeun (Daelim Industrial Co., Ltd, Se)
Park, Sangwoo (Department of Civil Engineering and Environment, Korea military academy)
Choi, Hangseok (School of Civil, Environmental and Architectural Engineering, Korea University)
Publication Information
Journal of the Korean Society for Geothermal and Hydrothermal Energy / v.15, no.4, 2019 , pp. 8-15 More about this Journal
Abstract
In order to design coaxial-type Ground Heat Exchangers (GHEXs) efficiently, the effect of components (i.e, heat exchange pipe and grouting material) on the thermal performance of coaxial-type GHEXs should be identified in advance. In this paper, three coaxial-type GHEXs with different configurations were constructed in a test bed. Then, the effect of heat exchange pipes and grouting materials on the thermal performance of coaxial-type GHEXs was investigated by performing in-situ thermal response tests (TRTs) and thermal performance tests (TPTs). In the TRTs, the effective thermal conductivities of the coaxial-type GHEXs with concrete grouting and STS pipes were improved by 6.15 and 22.7%, respectively compared to those of bentonite grouting and HDPE pipes. Additionally, in the TPTs, the use of concrete grouting and STS pipes in the coaxial-type GHEXs enhanced the in-situ thermal performance by 15 and 33.8%, respectively.
Keywords
Coaxial-type ground heat exchanger; Thermal response test; Thermal performance test; Pipe material; Grouting material;
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