论文标题
全彩色的日长次辐射冷却
Daylong sub-ambient radiative cooling with full color exterior
论文作者
论文摘要
陆地辐射冷却是通过提供零能量冷却来减轻住宅和商业部门加速冷却需求的有趣方法。但是，辐射冷却器的超白或镜面外观在视觉上可能是无菌的，并在广泛应用于建筑物和车辆时会引起安全问题。为了克服色彩多样性与冷却性能之间的基本权衡，我们提出了一个辐射整合的，有效的绝缘系统，该系统利用着色剂和热发射器之间的热非平衡。这使得这样的辐射冷却器可以在一天中的所有时间在环境温度以下冷却，同时表现出任何所需的外部颜色，包括黑色。我们通过实验表明，即使是在AM1.5条件下吸收646 WM-2太阳能的黑色冷却器，在白天在环境温度低于环境温度以下的最大6.9 K（平均3.5 K）。这些系统可能会用于户外应用，尤其是在商业建筑和住宅中，那里无碳的热管理需求量很高，但颜色的多样性对于视觉吸引力和舒适性也很重要。
Terrestrial radiative cooling is an intriguing way to mitigate the accelerating cooling demands in the residential and commercial sectors by offering zero-energy cooling. However, the ultra-white or mirror-like appearance of radiative coolers can be visually sterile and raise safety issues when broadly applied to building facades and vehicles. To overcome the fundamental trade-off between color diversity and cooling performance, we propose a radiatively integrated, conductively insulated system that exploits thermal non-equilibrium between colorants and thermal emitters. This allows such radiative coolers to be cooled below the ambient temperature at all times of the day while exhibiting any desired exterior color including black. We experimentally demonstrate that even black coolers, absorbing 646 Wm-2 of solar power under AM1.5 conditions, cools down to a maximum of 6.9 K (average of 3.5 K) below the ambient temperature during the daytime. These systems can potentially be used in outdoor applications, especially in commercial buildings and residential houses, where carbon-free thermal management is in high demand but diversity of colors is also important for visual appeal and comfort.
