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Study on the solar-thermal effect mechanism and energy balance relationship of heat-reflective pavement model in cold region

Author

Listed:
  • Wang, Jiwei
  • Zhao, Jingde
  • Xu, Xiangtian
  • Zhang, Mingyi
  • Liu, Yuhang
  • Bai, Ruiqiang
  • Wang, Yongtao
  • Kong, Xiangbing

Abstract

Against the backdrop of global warming and accelerated urbanization, the proliferation of dark asphalt pavements has exacerbated urban heat island effects and highway damage in cold regions. Heat-reflective pavement, a promising cooling pavement technology, has yet to be systematically studied in terms of experimental models, solar-thermal mechanisms, and energy balance. Relevant studies are still relatively scarce in typical cold regions. This paper attempts to address this gap by conducting experimental and theoretical analyses of heat-reflective pavements in typical cold regions. The findings reveal significant seasonal and climatic variations in the solar-thermal characteristics of these pavements. Heat-reflective pavements notably reduce the maximum, annual average, and amplitude of temperature and heat flux in asphalt surfaces, as well as the N-factor variation. Increasing pavement albedo from 0.05 to 0.78 results in a reduction of the annual average temperature and heat flux by approximately 4 °C and 12 W/m2. Furthermore, heat-reflective coatings significantly modify the energy balance of pavement surface, including the magnitudes, patterns, and proportions of heat exchanges. A new simple method for determining the upper thermal boundary conditions of heat-reflective pavements is proposed. The research results provide data accumulation and theoretical support for mitigating urban heat island effects and improving the thermal stability of permafrost embankments.

Suggested Citation

  • Wang, Jiwei & Zhao, Jingde & Xu, Xiangtian & Zhang, Mingyi & Liu, Yuhang & Bai, Ruiqiang & Wang, Yongtao & Kong, Xiangbing, 2025. "Study on the solar-thermal effect mechanism and energy balance relationship of heat-reflective pavement model in cold region," Energy, Elsevier, vol. 324(C).
    • Handle: RePEc:eee:energy:v:324:y:2025:i:c:s0360544225015865
    DOI: 10.1016/j.energy.2025.135944
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    1. Li, Gaosheng & Zhou, Yundong & Xu, Xiangtian & Gao, Yufeng & Zhao, Yuqin & Fan, Caixia & Sun, Weijun & Wang, Yongtao & Wang, Jiwei & Zhang, Yi, 2025. "Analytical method for calculating variation and transition state duration of subsurface soil temperature under thermal disturbance conditions," Energy, Elsevier, vol. 335(C).
    2. Chen, Yujing & Sha, Aimin & Lu, Qun & Jiang, Wei & Cao, Yangsen & Hu, Kui & Li, Chao & Du, Peidong, 2025. "Solar-to-heat conversion control of pavement through thermochromic coating: Integration of thermal management and visual temperature indication," Energy, Elsevier, vol. 333(C).

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