Pech-May Nelson W, Retsch Markus
Department of Chemistry, University of Bayreuth Universitätsstr. 30 95447 Bayreuth Germany
Nanoscale Adv. 2019 Nov 4;2(1):249-255. doi: 10.1039/c9na00557a. eCollection 2020 Jan 22.
Passive daytime cooling could contribute to the reduction of our global energy consumption. It is capable of cooling materials down to below ambient temperatures without the necessity of any additional input energy. Yet, current devices and concepts all lack the possibility to switch the cooling properties on and off. Here, we introduce dynamic control for passive radiative cooling during daytime. Using an angle-selective solar filter on top of a nocturnal passive radiator allows tuning the surface temperature of the latter in a wide range by just tilting the filter from normal incidence up to around 23°. This angle-selective filter is based on optically engineered, one-dimensional photonic crystal structures. We use numerical simulations to investigate the feasibility of a switchable low-pass filter/emitter device.
被动日间冷却有助于降低全球能源消耗。它能够将材料冷却至环境温度以下，而无需任何额外的输入能量。然而，目前的设备和概念都缺乏开启和关闭冷却特性的可能性。在此，我们介绍了日间被动辐射冷却的动态控制方法。在夜间被动散热器顶部使用角度选择性太阳能滤波器，只需将滤波器从垂直入射倾斜至约23°，即可在很宽的范围内调节后者的表面温度。这种角度选择性滤波器基于光学工程的一维光子晶体结构。我们使用数值模拟来研究可切换低通滤波器/发射器装置的可行性。
