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A high-performance radiative cooling glass based on multi-band selective regulation for synergistic heat dissipation
Siming Zhao1, Shuangdui Wu2, Zhenyu Guo1
1Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China. zhangrufan@tsinghua.edu.cn.
Abstract:
Visibly transparent radiative cooling (VTRC) glass offers a promising pathway for improving building energy efficiency. However, conventional designs of vertically installed VTRC materials often focus on optimizing emission or reflection across the entire mid-infrared (MIR) spectrum, neglecting the dual demand for outward radiative cooling and resistance to incoming thermal radiation from the surroundings. Herein, we proposed a strategy for selective mid-infrared regulation to overcome the above limitations and fabricated a multi-band selective regulation radiative cooling (MBSR-RC) glass through a simple blade-coating method. The fabricated MBSR-RC glass exhibited a precisely engineered spectrum. It maintained high VIS transmittance (85%), high NIR blocking (72%), and high emissivity (87%) in atmospheric transparent windows for heat dissipation, and a high reflectivity (60%) in the remaining MIR region to resist environmental heat. Consequently, compared with conventional radiative cooling glass and low-emissivity (low-E) glass under vertical installation, the multi-band selective regulation radiative cooling (MBSR-RC) glass achieved a maximized temperature reduction of 4 °C. Furthermore, it demonstrated high practicality, with high ultraviolet resistance, low thermal conductivity, and strong anti-raindrop stability. EnergyPlus simulations showed that, compared with normal buildings, an energy saving of 3.2 kWh m-2 could be achieved in buildings employing MBSR-RC. This work provides a novel and practical design strategy for energy-saving windows, showcasing significant potential for energy-efficient building applications.
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