[논문]열매체 순환수 배관이 매설된 콘크리트 도로 포장체의 표면 온도 변화와 방열량 평가

손병후; 김용기

doi:10.17664/ksghe.2023.19.3.001

열매체 순환수 배관이 매설된 콘크리트 도로 포장체의 표면 온도 변화와 방열량 평가
Evaluation of Surface Temperature Variation and Heat Exchange Rate of Concrete Road Pavement with Buried Circulating Water Piping 원문보기

한국지열·수열에너지학회논문집 = Journal of the Korean Society for Geothermal and Hydrothermal Energy, v.19 no.3, 2023년, pp.1 - 13

손병후 (한국건설기술연구원 건축에너지연구소) , 김용기 (한국건설기술연구원 건축에너지연구소)

Abstract ▼ AI-Helper

Hydronic heated road pavement (HHP) systems have been well established and documented to provide road safety in winter season over the past two decades. 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 performance. The aim of this study is to investigate the thermal performance of the concrete HHP systems, including surface temperature variations of experimental pavements in winter season. For preliminary study a small-scale experimental system was installed to evaluate the heat transfer characteristics of the concrete HHP in the test field. The system consists of 3 concrete slabs made of 1 m in width, 1 m in length, and 0.25 m in height. In these slabs, circulating water piping was embedded with different pipe depths of 0.08 m (Case A), 0.12 m (Case B), and 0.20 m (Case C) and same horizontal space 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. Overall, the surface temperature of the concrete HHPs remained above 3℃ in all experimental conditions applied in this study. The results of the surface temperature measurement with respect to the pipe depth showed that Case B was the highest among the three cases. However, the closer the circulating water pipe was to the pavement surface, the greater the heat exchange rate. This results is considered that the heat is continuously accumulated inside the pavements and then the temperature inside the pavements increases, while the amount of heat dissipation decreases as the temperature difference between the inlet and outlet of circulating water decreases. In this preliminary test the applicability of the concrete HHP on road deicing was confirmed. Finally, the results can be used as a basis for studying the effects of various variables on road pavements through numerical analysis and for conducting large-scale empirical experiments.

주제어

표/그림 (10)

그림 Fig. 1. Schematic diagram of experimental system.
그림 Fig. 2. Making process of experimental road pavements with circulating water piping and entire system installed in test field.
표 Table 1. Operating conditions with temperature ranges of water storage tank and flow rate of circulating water[24]
표 Table 2. Parameters and uncertainties[24]
그림 Fig. 3. Variations of temperature and heat exchange rate in concrete pavements for the entire measurement period.
그림 Fig. 4. Temperature variations in concrete road pavements for a specific day of condition 2(C2) applied.
그림 Fig. 5. Variations of temperature and heat exchange rate in concrete road pavements for a specific day of condition 2 applied.
그림 Fig. 6. Variations of temperature and heat exchange rate in concrete road pavements during 3 days with snowfall event.
그림 Fig. 7. Surface temperature of concrete road pavements with embedded pipe depth.
그림 Fig. 8. Heat exchange rate of concrete road pavements with embedded pipe depth.

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