Subambient daytime radiative cooling of vertical surfaces

IF 44.7 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Science Pub Date : 2024-11-14 DOI:10.1126/science.adn2524

Fei Xie, Weiliang Jin, J. Ryan Nolen, Hao Pan, Naiqin Yi, Yang An, Zhiyu Zhang, Xiangtong Kong, Fei Zhu, Ke Jiang, Sicong Tian, Tianji Liu, Xiaojuan Sun, Longnan Li, Dabing Li, Yun-Feng Xiao, Andrea Alu, Shanhui Fan, Wei Li

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引用次数: 0

Abstract

Subambient daytime radiative cooling enables temperatures to passively reach below ambient temperature, even under direct sunlight, by emitting thermal radiation toward outer space. This technology holds promise for numerous exciting applications. However, previous demonstrations of subambient daytime radiative cooling require surfaces that directly face the sky, and these cannot be applied to vertical surfaces that are ubiquitous in real-world scenarios such as buildings and vehicles. Here, we demonstrate subambient daytime radiative cooling of vertical surfaces under peak sunlight using a hierarchically designed, angularly asymmetric, spectrally selective thermal emitter. Under peak sunlight of about 920 watts per square meter, our emitter reaches a temperature that is about 2.5°C below ambient temperature, corresponding to a temperature reduction of about 4.3° and 8.9°C compared with a silica-polymer hybrid radiative cooler and commercial white paint, respectively.

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垂直表面白天的亚环境辐射冷却

即使在阳光直射的情况下，亚环境白天辐射冷却技术也能通过向外层空间发射热辐射，使温度被动地达到环境温度以下。这项技术有望得到广泛应用。然而，以往的亚环境白天辐射冷却演示需要直接面向天空的表面，而这些表面无法应用于建筑物和车辆等现实世界中无处不在的垂直表面。在这里，我们利用一种分层设计、角度不对称、光谱选择性热辐射器，演示了垂直表面在日照峰值下的亚环境日间辐射冷却。在每平方米约 920 瓦的峰值太阳光下，我们的辐射器能达到比环境温度低约 2.5°C 的温度，与硅聚合物混合辐射冷却器和商用白漆相比，温度分别降低了约 4.3° 和 8.9°C。

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

Science 综合性期刊-综合性期刊

CiteScore

61.10

自引率

0.90%

发文量

审稿时长

2.1 months

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