한국지반공학회:학술대회논문집 (Proceedings of the Korean Geotechical Society Conference)
- 한국지반공학회 2010년도 춘계 학술발표회
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- Pages.229-239
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- 2010
현장 열응답 시험을 통한 수직 밀폐형 지중열교환기의 성능 평가
Evaluation of performance of closed-loop vertical ground heat exchanger by In-situ thermal response test
- Lee, Chul-Ho (School of Civil, Environmental and Architectural, Engineering, Korea University) ;
- Park, Moon-Seo (School of Civil, Environmental and Architectural, Engineering, Korea University) ;
- Kwak, Tae-Hoon (School of Civil, Environmental and Architectural, Engineering, Korea University) ;
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Choi, Hang-Seok
(School of Civil, Environmental and Architectural, Engineering, Korea University)
- 발행 : 2010.03.25
초록
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 each other, 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 that of bentonite grouting, and the efficiency of graphite better performs over 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.
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