轨道板被动辐射冷却涂层的冷却机理和性能评价

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-03-29 DOI:10.1016/j.conbuildmat.2025.141057

Jiyi Mi , Wuwei Zou , Yan Wang , Yilun Gao , Jinhan Mo , Zhuo Chen

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引用次数: 0

摘要

无砟轨道板的热管理对保证高铁系统的长期耐久性至关重要。然而，目前的技术无法以一种简单而有效的方法实现轨道板的充分冷却。为了应对这一挑战，我们在本研究中调查了三种市售被动辐射冷却（PRC）涂层在轨道板表面冷却方面的潜在应用。实验分析表明，这些PRC涂层在远红外光谱中表现出高太阳反射率和强发射率，与未涂层的不锈钢板相比，在不锈钢板上实现了21.5-25.7°C的显着温度降低。驱动这种冷却效果的主要机制归因于太阳辐射的反射，贡献706-857 W/m²，或77 %-93 %的总冷却功率密度。自外辐射作用有限，显示出很大的改善潜力。光学性质被认为与涂层表面的介观光滑度呈正相关。值得注意的是，相同的PRC涂层在不同厚度下的冷却性能大致一致，这表明材料性能而不是厚度是冷却效率的主要因素。在无砟轨道板常用的C55混凝土试件上的进一步应用验证了PRC涂层的有效性，使试件表面温度平均降低16.2°C，内部温度梯度降低47°C/m。这些发现强调了与文献中报道的其他散热技术相比，PRC涂层具有优越的冷却能力。本研究为制定高速铁路基础设施可持续热管理策略提供了科学基础，并为PRC技术在土木工程中的更广泛应用提供了见解。

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Evaluation of the cooling mechanisms and performance of passive radiative cooling coatings in track-slab applications

The thermal management of ballastless track slabs is crucial to ensure the long-term durability of high-speed rail systems. However, current techniques fall short of achieving sufficient cooling of track slabs in a simple and efficient approach. In response to this challenge, we investigated the potential application of three commercially available passive radiative cooling (PRC) coatings for the surface cooling of track slabs in this study. The experimental analysis revealed that these PRC coatings demonstrated high solar reflectivity and strong emissivity in the far-infrared spectrum, achieving a significant temperature reduction of 21.5–25.7°C on stainless steel plates compared to uncoated plates. The primary mechanism driving this cooling effect is attributed to the reflection of solar radiation, contributing 706–857 W/m², or 77 %-93 % of the total cooling power density. Self-external radiation contributed limitedly, revealing a large potential for improvement. The optical properties are supposed to be positively correlated with the mesoscopic smoothness of the coating surfaces. Notably, the cooling performances of the same PRC coatings were approximately consistent across different thicknesses, suggesting that material properties rather than thickness are the dominant factors in cooling efficiency. Further application on C55 concrete specimens commonly used for ballastless track slabs validated the effectiveness of PRC coatings, reducing surface temperatures of specimens by an average of 16.2°C and decreasing the internal temperature gradient by 47°C/m. These findings underscore the superior cooling capacity of PRC coatings compared to other heat-dissipation techniques reported in the literature. This study provides a scientific foundation for developing sustainable thermal management strategies in high-speed rail infrastructure and offers insights into the broader application of PRC technology in civil engineering.

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.