Issue 1, 2020

Tunable daytime passive radiative cooling based on a broadband angle selective low-pass filter

Abstract

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.

Graphical abstract: Tunable daytime passive radiative cooling based on a broadband angle selective low-pass filter

Supplementary files

Article information

Article type
Paper
Submitted
04 9月 2019
Accepted
02 11月 2019
First published
04 11月 2019
This article is Open Access
Creative Commons BY license

Nanoscale Adv., 2020,2, 249-255

Tunable daytime passive radiative cooling based on a broadband angle selective low-pass filter

N. W. Pech-May and M. Retsch, Nanoscale Adv., 2020, 2, 249 DOI: 10.1039/C9NA00557A

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