Enhancing sustainable urban environments in China: Daytime radiative cooling for building energy efficiency and heat island mitigation

IF 10.1 1区工程技术 Q1 ENERGY & FUELS

Applied Energy Pub Date : 2025-05-17 DOI:10.1016/j.apenergy.2025.126138

Ze Li, Jianheng Chen, Chuyao Wang, Wenqi Wang, Yang Fu, Xu Chen, Rui Zhang, Aiqiang Pan, Tsz Chung Ho, Kaixin Lin, Lin Liang, Chi Yan Tso

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引用次数: 0

Abstract

Rapid urbanization in China has led to a significant increase in building energy consumption, highlighting the need for effective energy-saving strategies to enhance urban sustainability. Daytime radiative cooling (RC) offers a passive cooling solution that can reduce energy consumption without electricity usage. However, practical guidance on the applicability of RC coatings across diverse urban environments and climatic conditions remains limited. In this study, a RC model was integrated into the Urban Canopy Model (UCM) and validated through extensive large-scale field experiments. By simulating urban canyons in 338 cities across China, this work evaluated the potential of RC coatings applied to urban skins (walls and pavements) to enhance building energy efficiency. The analysis reveals that implementing RC coatings can significantly lower surface temperatures by up to 35 °C in Hong Kong and up to 40 °C in certain northwestern cities. This substantial temperature reduction leads to decreased building cooling loads, offering notable energy savings across different climatic zones. Based on these findings, strategic implementations of RC pavements and walls are proposed, particularly in densely populated high-rise areas within the temperate and hot-summer/warm-winter regions of China's climate zones. This research provides actionable strategies for reducing energy consumption in the built environment.

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加强中国城市环境的可持续发展：日间辐射冷却对建筑能源效率和热岛缓解的影响

中国快速的城市化导致了建筑能耗的显著增加，因此需要有效的节能策略来增强城市的可持续性。日间辐射冷却（RC）提供了一种被动冷却解决方案，可以在不用电的情况下减少能源消耗。然而，关于RC涂料在不同城市环境和气候条件下的适用性的实际指导仍然有限。本研究将RC模型整合到城市冠层模型（Urban Canopy model， UCM）中，并通过大规模的野外试验进行验证。通过模拟中国338个城市的城市峡谷，本研究评估了钢筋混凝土涂料应用于城市表皮（墙壁和路面）以提高建筑能效的潜力。分析显示，在香港实施RC涂层可以显著降低表面温度，最高可达35°C，在某些西北城市可达40°C。这种大幅度的温度降低降低了建筑的冷负荷，在不同的气候区提供了显著的节能。基于这些发现，本文提出了混凝土路面和墙体的战略实施方案，特别是在中国气候区温带和夏季炎热/冬季暖冬地区人口密集的高层地区。本研究为减少建筑环境中的能源消耗提供了可行的策略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Energy 工程技术-工程：化工

CiteScore

21.20

自引率

10.70%

发文量

1830

审稿时长

41 days

期刊介绍： Applied Energy serves as a platform for sharing innovations, research, development, and demonstrations in energy conversion, conservation, and sustainable energy systems. The journal covers topics such as optimal energy resource use, environmental pollutant mitigation, and energy process analysis. It welcomes original papers, review articles, technical notes, and letters to the editor. Authors are encouraged to submit manuscripts that bridge the gap between research, development, and implementation. The journal addresses a wide spectrum of topics, including fossil and renewable energy technologies, energy economics, and environmental impacts. Applied Energy also explores modeling and forecasting, conservation strategies, and the social and economic implications of energy policies, including climate change mitigation. It is complemented by the open-access journal Advances in Applied Energy.