Journal of the Korean Society for Geothermal and Hydrothermal Energy (한국지열·수열에너지학회논문집)

Korean Society for Geothermal and Hydrothermal Energy (한국지열·수열에너지학회)
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Analysis of Surface Temperature Change and Heat Dissipation Performance of Road Pavement with Buried Circulating Water Piping

열매체 순환수 배관이 매설된 도로 포장체의 표면 온도 변화와 방열 성능 분석

  • Byonghu Sohn (Department of Building Energy Research, KICT) ;
  • Muhammad Usman (Department of Building Energy Research, KICT) ;
  • Yongki Kim (Department of Building Energy Research, KICT)
  • 손병후 (한국건설기술연구원 건축에너지연구소) ;
  • 우스만 무하마드 (한국건설기술연구원 건축에너지연구소) ;
  • 김용기 (한국건설기술연구원 건축에너지연구소)
  • Received : 2023.05.11
  • Accepted : 2023.05.30
  • Published : 2023.06.01
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Abstract

Hydronic heated road pavement (HHP) systems have well studied and documented by many researchers. However, most of the systems run on asphalt, only a few are tested with concrete, and there rarely is a comparison between those two common road materials in their heating and cooling performance. The aim of this study is to investigate the thermal performance of the HHP, such as heat dissipation performance in winter season while focusing on the surface temperature of the concrete and asphalt pavement. For preliminary study a small-scale experimental system was designed and installed to evaluate the heat transfer characteristics of the HHP in the test field. The system consists of concrete and asphalt slabs made of 1 m in width, 1 m in length, and 0.25 m in height. In two slabs, circulating water piping was embedded at a depth of 0.12 m at intervals of 0.16 m. Heating performance in winter season was tested with different inlet temperatures of 25℃, 30℃, 35℃ and 40℃ during the entire measurement period. The results indicated that concrete's heating performance is better than that of asphalt, showing higher surface temperatures for the whole experiment cases. However, the surface temperature of both concrete and asphalt pavement slabs remained above 0℃ for all experimental conditions. The heat dissipation performance of concrete and asphalt pavements was analyzed, and the heat dissipation of concrete pavement was greater than that of asphalt. In addition, the higher the set temperature of the circulating water, the higher the heat dissipation. On the other hand, the concrete pavement clearly showed a decrease in heat dissipation as the circulating water set temperature decreased, but the decrease was relatively small for the asphalt pavement. Based on this experiment, it is considered that a circulating water temperature of 20℃ or less is sufficient to prevent road ice. However, this needs to be verified by further experiments or computational fluid dynamic (CFD) analysis.

Keywords

Acknowledgement

본 연구는 과학기술정보통신부 한국건설기술연구원 연구운영비지원(주요사업) 사업으로 수행되었습니다(과제번호 20230175-001, 도로 살얼음 예방을 위한 도로 포장체 이용 계절간 기중 축열 및 방열 기술 개발).

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