Preparation of Passive Daytime Cooling Fabric with the Synergistic Effect of Radiative Cooling and Evaporative Cooling,Advanced Materials Technologies

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Preparation of Passive Daytime Cooling Fabric with the Synergistic Effect of Radiative Cooling and Evaporative Cooling
Advanced Materials Technologies ( IF 6.4 ) Pub Date : 2021-10-16 , DOI: 10.1002/admt.202100803
Yilan Sun ₁ , Yating Ji ₁ , Muhammad Javed ₁ , Xiaoyan Li ₁ , Zhuizhui Fan ₁ , Youquan Wang ₁ , Zaisheng Cai ₁ , Bi Xu ₁

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Passive daytime radiative cooling (PDRC) has attracted intensive attention due to its great potential in reduced energy consumption. However, the practical application for PDRC is greatly affected by geographical location and the intrinsic cooling power. Herein, a composite flexible fabric with the synergistic effect of evaporative cooling and radiative cooling is reported. A porous polymer coating with both a high solar reflectivity (90%) and a high infrared thermal emissivity (83%) is fabricated on the top side of the fabric, which can achieve effective PDRC performance. Meanwhile, hygroscopic salts are loaded on the bottom side of the fabric, which can capture water vapor at night and realize evaporative cooling during the daytime. The temperature reduction of 10.8 °C can be achieved under the direct sunlight irradiation (465 W m⁻²) for the prepared fabric in the outdoor experiment. The combination of radiative cooling and evaporative cooling breaks through the traditional single passive cooling mode and has great potential in further improving the performance of passive cooling.

中文翻译：

辐射冷却和蒸发冷却协同作用的被动式日间降温织物的制备

被动式日间辐射冷却（PDRC）因其在降低能耗方面的巨大潜力而引起了广泛关注。然而，PDRC的实际应用受地理位置和固有冷却能力的影响很大。本文报道了一种具有蒸发冷却和辐射冷却协同作用的复合柔性织物。在织物的顶面制备了具有高太阳反射率（90%）和高红外热发射率（83%）的多孔聚合物涂层，可以实现有效的 PDRC 性能。同时，吸湿性盐分装载在织物的底面，可以在夜间捕捉水蒸气，在白天实现蒸发降温。在阳光直射（465 W m^-2 ) 用于户外实验中准备好的织物。辐射冷却与蒸发冷却相结合，突破了传统单一的被动冷却方式，在进一步提升被动冷却性能方面具有巨大潜力。

更新日期：2021-10-16

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