Hu Lechuan, Wang Chengchao, Zhu Haojun, Zhou Yan, Li Haizeng, Liu Linhua, Ma Lanxin
School of Energy and Power Engineering, Shandong University, Jinan, Shandong, 250061, China.
Optics & Thermal Radiation Research Center, Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao, Shandong, 266237, China.
Small. 2024 Jul;20(30):e2306823. doi: 10.1002/smll.202306823. Epub 2024 Feb 25.
The architectural window with spectrally selective features and radiative cooling is an effective way to save building energy consumption. However, architectural windows that combine both functions are currently based on micro-nano photonic structures, which undoubtedly hinder their commercial application due to the complexity of manufacture. Herein, a novel tunable visible light transmittance radiative cooling smart window (TTRC smart window) with perfect near-infrared (NIR) shielding ability is manufactured via a mass-producible scraping method. TTRC smart window presents high luminous transmittance (T = 56.8%), perfect NIR shielding (T = 3.4%), bidirectional transparency adjustment ability unavailable in other transparent radiative coolers based on photonic structures (ΔT = 54.2%), and high emittance in the atmospheric window (over 94%). Outdoor measurements confirm that smart window can reduce 8.2 and 6.6 °C, respectively, compared to ordinary glass and indium tin oxide (ITO) glass. Moreover, TTRC smart window can save over 20% of annual energy in the tropics compared to ITO and ordinary glass. The simple preparation method employed in this work and the superior optical properties of the smart window have significantly broadened the scope of application of architectural windows and advanced the commercialization of architectural windows.
具有光谱选择性特征和辐射冷却功能的建筑窗户是降低建筑能耗的有效途径。然而，目前兼具这两种功能的建筑窗户是基于微纳光子结构，由于制造工艺复杂，无疑阻碍了它们的商业应用。在此，通过大规模生产的刮涂法制备了一种新型的具有完美近红外（NIR）屏蔽能力的可调可见光透过率辐射冷却智能窗（TTRC智能窗）。TTRC智能窗具有高透光率（T = 56.8%）、完美的近红外屏蔽（T = 3.4%）、基于光子结构的其他透明辐射冷却器所不具备的双向透明度调节能力（ΔT = 54.2%）以及在大气窗口的高发射率（超过94%）。户外测量证实，与普通玻璃和氧化铟锡（ITO）玻璃相比，智能窗分别可降低8.2和6.6°C。此外，与ITO玻璃和普通玻璃相比，TTRC智能窗在热带地区每年可节省超过20%的能源。本工作所采用的简单制备方法以及智能窗优异的光学性能显著拓宽了建筑窗户的应用范围，并推动了建筑窗户的商业化进程。
