具有自清洁功能的辐射冷却膜

ty10086 提交于 周三, 08/25/2021 - 15:49
文章英文标题
Radiative cooling film with self-cleaning function
正文
辐射制冷作为一种新型的制冷技术,可以在不消耗能量的情况下降低物体的温度,具有广阔的发展前景。但由于表面长期暴露于室外环境,表面沉积的颗粒影响辐射冷却性能。本研究提出了一种具有自清洁功能的辐射冷却多层膜。采用不同粒径和比例的聚二甲基硅氧烷( PDMS )和SiO2粒子的混合物,设计制造了顶面,实现了自清洁特性。底面由PDMS和Al膜组成。进一步,本研究采用传输矩阵法优化了底层PDMS和Al膜的结合和厚度,采用FDTD法对SiO2的粒径、体积分数和涂层厚度进行了优化。最后,将底层PDMS层厚度优化为40   μ m,SiO2粒径分别为0.04   μ m和0.1   μ m,涂层厚度为40   μ m,在此基础上进行了理论净冷却功率计算和实验测试。计算结果表明,在美国标准大气模式条件下,净冷量可达59.04   W / m2,两种不同大气模式条件下的净冷量差值为24.36   W / m2。实验结果还表明,白天可使物体最高温度降低2.1  ℃,夜间可降低3.44  ℃,最大表面接触角可达164.45°,除实现辐射冷却外,研制的薄膜具有最优的自清洁性能,可有效降低运行维护成本。此外,制备工艺简单,价格低廉,显示出很高的实际应用潜力。
文章内容(英文)
As a new type of refrigeration technique, radiative cooling can reduce the temperature of the object without consuming energy, thus, exhibiting a significant development prospect. However, due to the long-term exposure of the surface to the outdoor environment, the particles deposited on the surface affect the radiative cooling performance. In this study, a radiative cooling multilayer film with self-cleaning function has been proposed. The top surface has been designed and manufactured by employing a mixture of polydimethylsiloxane (PDMS) and SiO 2 particles with different particle sizes and proportions to achieve the self-cleaning character. The bottom surface is composed of PDMS and Al films. Further, the transfer matrix method has been used in this study to optimize the combination and thickness of the bottom PDMS and Al films, and the FDTD method has been used to optimize the SiO 2 particle size, volume fraction and coating thickness. Finally, the thickness of the bottom PDMS layer has been optimized to 40 μm, with the SiO 2 particle sizes of 0.04 μm and 0.1 μm and the coating thickness of 40 μm, based on which the theoretical net cooling power calculations and experimental trials have been carried out. The calculation results show that the net cooling power can reach 59.04 W/m 2 under the conditions of the American standard atmospheric model, and the difference in the net cooling power under the two different atmospheric model conditions is 24.36 W/m 2 . The experimental results also reveal that the maximum temperature of the object can be reduced by 2.1 °C during the day and 3.44 °C at night, with the maximum surface contact angle reaching up to 164.45°. In addition to the achievement of radiative cooling, the developed film possesses an optimal self-cleaning performance and can effectively reduce the maintenance cost during operation. In addition, the preparation process is simple and inexpensive, thus, exhibiting the high potential of real-life applications.
来源出处
Journal|[J]Solar Energy Materials and Solar CellsVolume 228, 2021.
DOI
https://doi.org/10.1016/J.SOLMAT.2021.111117

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