Comparison of effective thermal conductivity in closed-loop vertical ground heat exchangers
- Authors
- Lee, Chulho; Park, Moonseo; Min, Sunhong; Kang, Shin-Hyung; Sohn, Byonghu; Choi, Hangseok
- Issue Date
- 12월-2011
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Ground heat exchanger; In-situ thermal response test; Thermal conductivity; Thermal interference
- Citation
- APPLIED THERMAL ENGINEERING, v.31, no.17-18, pp.3669 - 3676
- Indexed
- SCIE
SCOPUS
- Journal Title
- APPLIED THERMAL ENGINEERING
- Volume
- 31
- Number
- 17-18
- Start Page
- 3669
- End Page
- 3676
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/111083
- DOI
- 10.1016/j.applthermaleng.2011.01.016
- ISSN
- 1359-4311
- Abstract
- Performing a series of in-situ thermal response tests, the effective thermal conductivity of six vertical closed-loop ground heat exchangers was experimentally evaluated and compared to each other, which were constructed in a test bed in Wonju, South Korea. To compare thermal efficiency of the ground heat exchangers in field, the six boreholes were constructed with different construction conditions: i.e., different grouting materials (cement vs. bentonite), different shape of heat exchange pipe-sections (conventional U-loop type vs. new 3 pipe-type), and different additives (silica sand vs. graphite). One observation borehole was installed in the middle of the test site to measure a subsurface temperature change during performing the in-situ thermal response test. From the test results, it can be shown that cement grouting has a higher effective thermal conductivity than that of bentonite grouting, and graphite better performs over silica sand as a thermally enhancing addictive. In addition, a new 3 pipe-type heat exchanger yields less thermal interference between the inlet and outlet pipe than the conventional U-loop type heat exchanger, which results in superior thermal performance. (C) 2011 Elsevier Ltd. All rights reserved.
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Collections - College of Engineering > School of Civil, Environmental and Architectural Engineering > 1. Journal Articles
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