수치해석을 통한 수직 밀폐형 지중열교환기 단면의 열전달 효율 분석Numerical Evaluation on Thermal Performance and Sectional Efficiency of Closed-Loop Vertical Ground Heat Exchanger
- Other Titles
- Numerical Evaluation on Thermal Performance and Sectional Efficiency of Closed-Loop Vertical Ground Heat Exchanger
- Authors
- 길후정; 이강자; 이철호; 최항석
- Issue Date
- 2009
- Publisher
- 한국지반공학회
- Keywords
- Ground heat exchanger; HDPE pipe; Latticed pipe; Sectional efficiency
- Citation
- 한국지반공학회논문집, v.25, no.3, pp.57 - 64
- Indexed
- KCI
- Journal Title
- 한국지반공학회논문집
- Volume
- 25
- Number
- 3
- Start Page
- 57
- End Page
- 64
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/121632
- ISSN
- 1229-2427
- Abstract
- This paper presents a series of numerical simulations on the thermal performance and sectional efficiency of a closed-loop vertical ground heat exchanger (U-loop) in a geothermal heat pump system (GHP). A 2-D finite element analysis adopting ANSYS was employed to evaluate the temperature distribution over the cross section of the U-loop system involving HDPE pipe/grout/soil to compare the sectional efficiency between the conventional U-loop and a new latticed HDPE pipe system, which is equipped with a thermally insulating lattice in order to reduce thermal interference from the inlet pipe to outlet pipe. In addition, a 3-D finite volume analysis (FLUENT) was used in simulating the operation of the closed-loop vertical ground heat exchanger with the consideration of the effect of grout’s thermal properties, the rate of circulation pump, the distance between the inlet and outlet pipes, and the effectiveness of the latticed HDPE pipe system. It was observed that the thermal interference between the two strands of U-loop is of importance in determining the efficiency of the ground heat exchanger. Therefore, it is highly recommended to modify the configuration of the conventional U-loop system by equipping the thermal insulating lattice between the two pipe strands.
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Collections - College of Engineering > School of Civil, Environmental and Architectural Engineering > 1. Journal Articles
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