설비공학논문집 (Korean Journal of Air-Conditioning and Refrigeration Engineering)

  • 제23권5호
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  • Pages.356-364
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  • 2011
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  • 1229-6422(pISSN)
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  • 2465-7611(eISSN)
대한설비공학회 (The Society of Air-Conditioning and Refrigerating Engineers of Korea)
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단일 탐침법을 이용한 수평형 지중열교환기 뒤채움재의 열확산계수 산정

Thermal Diffusivity Evaluation of Backfilling Materials for Horizontal Ground Heat Exchanger Using Single-Probe Method

  • 손병후 (한국건설기술연구원 설비플랜트연구실) ;
  • 최항석 (고려대학교 건축사회환경공학과)
  • Sohn, Byong-Hu (Plant Research Division, Korea Institute of Construction Technology) ;
  • Choi, Hang-Seok (School of Civil, Environmental and Architectural Engineering, Korea University)
  • 투고 : 2011.03.07
  • 심사 : 2011.04.20
  • 발행 : 2011.05.10
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초록

Storage and transfer heat in soils is governed by the soil thermal properties and these properties are therefore needed in many engineering applications, including horizontal ground heat exchanger for ground-coupled heat pumps. This paper presents the evaluation results of the thermal diffusivity of soils (silica, quartzite, limestone, sandstone, granite, and two masonry soils used for the trench backfilling materials of the horizontal ground heat exchanger. To assess this thermal property, we (i) measure the soil thermal conductivities using single-probe method and (ii) use the de Vries method of summing the heat capacities of the soil constituents. The results show that the thermal diffusivity tends to increase as dry soil begins to wet, but it approaches a constant value or even decreases as the soil continues to wet. Combined algorithm with and improved model for the thermal conductivity of soils and the constituent equation provides accurate estimates of the soil thermal diffusivity.

키워드

참고문헌

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피인용 문헌

  1. Performance Analysis of Ground-Coupled Heat Pump System with Slinky-Type Horizontal Ground Heat Exchanger vol.24, pp.3, 2012, https://doi.org/10.6110/KJACR.2012.24.3.230