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Issue 1, 2020
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Tunable daytime passive radiative cooling based on a broadband angle selective low-pass filter

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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

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Supplementary files

Article information


Submitted
04 Sep 2019
Accepted
02 Nov 2019
First published
04 Nov 2019

This article is Open Access

Nanoscale Adv., 2020,2, 249-255
Article type
Paper

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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