Development of spectrally self-switchable cover with phase change material for dynamic radiative cooling
Development of spectrally self-switchable cover with phase change material for dynamic radiative cooling
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开发用于动态辐射冷却的具有相变材料的光谱自切换盖
DOI：
10.1016/j.solmat.2022.112125
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发表时间：
2023-03
影响因子：
6.9
通讯作者：
Li Wang
中科院分区：
文献类型：
--
作者：
Weiguang Su;Ruigeng Kang;Pei Cai;Mingke Hu;Georgios Kokogiannakis;Jo Darkwa;Jun Chen;Shuhui Xu;Li Wang
辐射冷却通过将废热以被动的方式发送到宇宙深处，有望成为对抗全球变暖的有效策略。然而，制冷供应和需求之间的不匹配会显著损害光谱静态辐射制冷装置在寒冷天气中的功效。因此，本工作引入石蜡作为相变材料（PCM），以开发用于柔性辐射冷却的光谱自切换盖（SSC）。研究了石蜡在不同温度、不同厚度、不同物相条件下的透光率。在UV-VIS-NIR波段，石蜡在液相中的透过率大于90%，而在固相中的透过率小于5%。在“大气窗口”波段，石蜡在液相中的透过率也远高于在固相中的透过率，最大相差41.1%。用双厚度反演法计算了各种石蜡在固相和液相中的光学常数。在0.19-1.1 μm和8-13 μm波段，计算值与实测值的平均误差分别为1.8%和4%。固态石蜡的微观结构分析表明，石蜡颗粒大小约为10 μm，晶界交错且不规则。集成的多层状结构导致固态石蜡的透射率显著降低。最后，制备了PE-PCM-PE（聚乙烯-相变材料-聚乙烯）自切换盖，并对其进行了光谱表征。石蜡基覆盖物为实现动态辐射冷却提供了一种新的低成本候选解决方案。
Radiative cooling promises an effective strategy against global warming by sending waste heat to the deep universe in a passive manner. However, the mismatch between cooling supply and demand can significantly compromise the efficacy of spectrally-static radiative cooling devices in cold weather. Therefore, the present work introduced paraffin wax as the phase change material (PCM) to develop a spectrally self-switchable cover (SSC) for flexible radiative cooling. The transmittance of the paraffin wax at different temperatures, thicknesses and phases was characterized. In the UV-VIS-NIR band, the transmittance of the paraffin wax was over 90% in the liquid phase but below 5% in the solid phase. In the “atmospheric window” band, the transmission of the paraffin wax in the liquid phase was also much higher than that in the solid phase with a maximum difference of 41.1%. The optical constants of various paraffin waxes in solid and liquid phases were calculated according to the two-thickness inversion method. The average error of transmittance between the calculated and measured values was only 1.8% and 4% for the 0.19–1.1 μm and 8–13 μm bands, respectively. Moreover, the microstructure analysis of the solid-state paraffin wax revealed that the size of paraffin grains was around 10 μm with interlocking and irregular grain boundaries. The integrated multilayered-like structure resulted in a significant transmittance reduction of the solid-state paraffin wax. In the end, self-switchable PE-PCM-PE (polyethylene-phase change material-polyethylene) covers were prepared and spectrally characterized. The paraffin-based cover provided a new and low-cost candidate solution for achieving dynamic radiative cooling.
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