Active W-VO2-based Kirigami-structured films with digital control for energy efficient smart window

IF 6.3 2区材料科学 Q2 ENERGY & FUELS

Solar Energy Materials and Solar Cells Pub Date : 2025-03-08 DOI:10.1016/j.solmat.2025.113551

Zhengjie Chen , Chengchen Feng , Lin Jiang , Yujie Ke , Xiaoxue Han , Xinghai Liu

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引用次数: 0

Abstract

Smart window promises to enhance the building energy efficiency by dynamically controlling the indoor solar irradiation. In this study, a new thermochromic smart films for smart window applications were proposed. This film is based on polyvinylpyrrolidone (PVP)-coated tungsten-doped VO₂ (W-VO₂) and polyurethane acrylate (PUA). It is demonstrated that the PVP-coating technique plays a vital role in improving the optical properties of the film and the dispersion of W-VO₂ in PUA. The optimized 3D-printed Kirigami-structured films exhibit favorable tensile properties and improved optical properties. Furthermore, an innovative device has been developed to enable automatic adjustment of the film stretch rate in response to the angle of sunlight, ensuring the smart window's dynamic response to sunlight. The film's solar transmittance varies between 48.50 % and 78.56 % during stretching, accompanied by a solar modulation up to 30.05 %. In the indoor and outdoor demo experiments, the temperature drops by 5.2 °C and 4.8 °C, respectively, compared to a PUA film window. The work developed a new film for energy-efficient smart windows and provides a systematic technological route from materials synthesis, structural optimization, system digital control, to practical demo assessment, which promises to facilitate the development of VO₂-based materials and energy-efficient windows.

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主动w - vo2基里伽米结构薄膜与数字控制节能智能窗口

智能窗户有望通过动态控制室内太阳辐照来提高建筑的能源效率。在这项研究中，提出了一种用于智能窗口应用的新型热致变色智能薄膜。该薄膜是基于聚乙烯吡咯烷酮（PVP）涂层掺杂钨的VO2 （W-VO2）和聚氨酯丙烯酸酯（PUA）。结果表明，pvp涂层技术对提高膜的光学性能和W-VO2在PUA中的分散性能起着至关重要的作用。优化后的3d打印基里伽米结构薄膜具有良好的拉伸性能和改善的光学性能。此外，还开发了一种创新装置，可以根据阳光的角度自动调节薄膜的拉伸率，确保智能窗户对阳光的动态响应。在拉伸过程中，薄膜的太阳透射率在48.50% ~ 78.56%之间变化，伴随着高达30.5%的太阳调制。在室内和室外演示实验中，与PUA膜窗相比，温度分别下降5.2℃和4.8℃。研究开发了一种新型节能智能窗膜，提供了从材料合成、结构优化、系统数字化控制到实际演示评估的系统技术路线，有望促进vo2基材料和节能窗的发展。

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来源期刊

Solar Energy Materials and Solar Cells 工程技术-材料科学：综合

CiteScore

12.60

自引率

11.60%

发文量

513

审稿时长

47 days

期刊介绍： Solar Energy Materials & Solar Cells is intended as a vehicle for the dissemination of research results on materials science and technology related to photovoltaic, photothermal and photoelectrochemical solar energy conversion. Materials science is taken in the broadest possible sense and encompasses physics, chemistry, optics, materials fabrication and analysis for all types of materials.