论文标题
用角盾辐射冷却：减轻大气辐射和寄生加热
Radiative Cooling with Angular Shields: Mitigating Atmospheric Radiation and Parasitic Heating
论文作者
论文摘要
辐射冷却是对基于饥饿的蒸气压缩冷却的一种可持续解决方案。但是，通过辐射冷却来实现亚冻结温度在高湿度的环境中仍然具有挑战性，并且通常需要通过将热发射器放置在超高真空条件下，例如，例如通过将热发射器放置。从理论上讲，这项工作研究了用角盾通过发射极环绕发射器的角度选择性热发射。研究了发射极选择性，环境的湿度以及寄生加热对冷却性能的影响。在理想条件下，盾牌的最佳角度显示为45°。另外，对于在最低平衡温度中获得明显的改善，需要对热发射的光谱选择性。在潮湿的环境中，与角屏蔽相比，发射极的热发射函数通过工程进行了角度的选择性提供了更好的冷却性能。相反，在引入寄生加热时，Angular Shields的性能优越。使用Angular Shields使冷却发射器可以在没有真空的情况下进行冻结温度，并且在潮湿的水平下高于全球平均水平。
Radiative cooling emerged as a possible sustainable solution to the energy hungry vapor compression-based cooling. However, realizing subfreezing temperatures through radiative cooling remains challenging in environments with high humidity and often requires extreme heat management, e.g., by placing the thermal emitter in ultrahigh vacuum conditions. This work theoretically investigates the introduction of angular selective thermal emission through surrounding the emitter with an angular shield. The effect of the spectral selectivity of the emitter, the humidity of the environment, and the introduction of parasitic heating on the cooling performance is studied. The optimal angle for the shield under ideal conditions is shown to be 45°. In addition, spectral selectivity of thermal emission is necessary to obtain noticeable improvement in the minimum equilibrium temperature. In humid environments, angular selectivity through engineering the thermal emissivity function of the emitter provides a better cooling performance compared to angular shields. Conversely, angular shields performance is superior when introducing parasitic heating. Using angular shields enables cooling emitters to subfreezing temperatures without vacuum and under humid levels higher than the global average.
