基于光选择性不对称组装的原位可切换纳米纤维薄膜,实现全年节能

IF 9.5 2区 材料科学 Q1 CHEMISTRY, PHYSICAL
Liuqian An, Jiaxiang Ma, Peizhi Wang, Aleksandr Kuchmizhak, Jinxin Yao, Hongbo Xu and Wei Wang
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引用次数: 0

摘要

建筑热管理消耗了全球 51% 的能源。通过日光收集和辐射冷却方法可以实现能源利用的优化,但由于两者的工作原理相反,在静态条件下同时利用这两种方法具有挑战性。在此,通过对由对比聚合物纳米纤维制成的光反射层和光吸收层进行有序电纺丝,制备出了一种可原位切换的光选择性聚合物(PSP)材料。制备的 PSP 材料对太阳光的反射率高达 97.7%,宽带发射率高达 94.9%,辐射制冷功率为 111.1 W-m-2。PSP 薄膜的这种 "冷却 "状态可以通过浸渍指数匹配液轻松转换为 "加热 "状态,指数匹配液可以抑制薄膜-空气界面的散射,降低薄膜的太阳光波段反射率。得益于所设计的 PSP 薄膜的高多孔结构,其切换过程不超过 5 分钟,可实现约 95.6% 的太阳综合吸收率,估计加热功率为 781.6 W-m-2。所进行的数值计算进一步证实了所开发的 PSP 薄膜在高纬度地区建筑物热管理方面的巨大潜力,其节能效果可达 89.74 GJ m-2-y-1,二氧化碳排放量减少到 21.69 吨。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

In situ switchable nanofiber films based on photoselective asymmetric assembly towards year-round energy saving†

In situ switchable nanofiber films based on photoselective asymmetric assembly towards year-round energy saving†

Thermal management of buildings consumes 51% of the world's energy use. Optimization of the energy use can be potentially achieved via daylight harvesting and radiative cooling approaches, yet their simultaneous utilization under static conditions is challenging due to opposite operation principles. Here, an in situ switchable photoselective polymer (PSP) material was prepared by sequential electrospinning of light-reflecting and light-absorbing layers made of contrasting polymer nanofibers. The as-prepared PSP material exhibited a high solar light reflectance of 97.7% and a high broadband emissivity of 94.9% resulting in a radiative cooling power of 111.1 W m−2. Such “cooling” state of the PSP film can be easily switched to a “heating” one via impregnation of an index matching liquid that suppresses scattering at the film–air interface and reduces the solar band reflectivity of the film. Thanks to the highly porous structure of the designed PSP film, its switching takes less than 5 min and allows an integrated solar absorbance of ∼95.6% to be achieved, resulting in an estimated heating power of 781.6 W m−2. Performed numerical calculations further supported the high potential of the developed PSP film for thermal management of buildings located at high latitudes with energy savings up to 89.74 GJ m−2 per year and reduced CO2 emissions down to 21.69 t.

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来源期刊
Journal of Materials Chemistry A
Journal of Materials Chemistry A CHEMISTRY, PHYSICAL-ENERGY & FUELS
CiteScore
19.50
自引率
5.00%
发文量
1892
审稿时长
1.5 months
期刊介绍: The Journal of Materials Chemistry A, B & C covers a wide range of high-quality studies in the field of materials chemistry, with each section focusing on specific applications of the materials studied. Journal of Materials Chemistry A emphasizes applications in energy and sustainability, including topics such as artificial photosynthesis, batteries, and fuel cells. Journal of Materials Chemistry B focuses on applications in biology and medicine, while Journal of Materials Chemistry C covers applications in optical, magnetic, and electronic devices. Example topic areas within the scope of Journal of Materials Chemistry A include catalysis, green/sustainable materials, sensors, and water treatment, among others.
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