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현장 열응답 시험을 통한 수직 밀폐형 지중열교환기용 그라우트와 열교환 파이프 단면의 성능 평가Evaluation of Performance of Grouts and Pipe Sections for Closed-loop Vertical Ground Heat Exchanger by In-situ Thermal Response Test

Other Titles
Evaluation of Performance of Grouts and Pipe Sections for Closed-loop Vertical Ground Heat Exchanger by In-situ Thermal Response Test
Authors
최항석박문서민선홍손병후이철호
Issue Date
2010
Publisher
한국지반공학회
Keywords
Addictive; Bentonite grout; Cementitious grout; Thermal conductivity; Thermal response test; Addictive; Bentonite grout; Cementitious grout; Thermal conductivity; Thermal response test
Citation
한국지반공학회논문집, v.26, no.7, pp.93 - 106
Indexed
KCI
Journal Title
한국지반공학회논문집
Volume
26
Number
7
Start Page
93
End Page
106
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/117824
ISSN
1229-2427
Abstract
In performing a series of in-situ thermal response tests, the effective thermal conductivities of six vertical closed-loop ground heat exchangers were experimentally evaluated and compared one another, which were constructed in a test bed in Wonju. To compare thermal efficiency of the ground heat exchangers in field, the six boreholes were constructed with different construction conditions: grouting materials (cement vs. bentonite), different additives (silica sand vs. graphite) and the shape of pipe-sections (general U-loop type vs. 3 pipe-type). From the test results, it can be concluded that cement grouting has a higher effective thermal conductivity than bentonite grouting, and the efficiency of graphite better performs than silica sand as a thermally-enhancing addictive. In addition, a new 3 pipe-type heat exchanger provides less thermal interference between the inlet and outlet pipe than the conventional U-loop type heat exchanger, which results in superior thermal performance. Based on the results from the in-situ thermal response tests, a series of economic analyses have been made to show the applicability of the new addictives and 3 pipe-type heat exchanger.
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College of Engineering (School of Civil, Environmental and Architectural Engineering)
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