Angularly selective thermal emitters for robust and deep subfreezing daytime radiative cooling (Conference Presentation)

Mohamed El Kabbash; Chunlei Guo; Wei Li; Sandeep Chamoli

doi:10.1117/12.2638219

3 October 2022 Angularly selective thermal emitters for robust and deep subfreezing daytime radiative cooling (Conference Presentation)

Mohamed El Kabbash, Chunlei Guo, Wei Li, Sandeep Chamoli

Author Affiliations +

Proceedings Volume PC12195, Metamaterials, Metadevices, and Metasystems 2022; PC121950Q (2022) https://doi.org/10.1117/12.2638219
Event: SPIE Nanoscience + Engineering, 2022, San Diego, California, United States

Abstract

We analyze the impact of angular selectivity on the radiative cooling performance of thermal emitters. We show that combining angular and spectral selectivity enables realizing deep subfreezing temperatures. While angularly selective thermal emitters are robust to environmental effects, they require management of non-radiative heat transfer processes. We introduce a general scheme to realize angularly and spectrally selective absorption/emission using a thin film stack consisting with a total thickness of ~ 9 μm; an order of magnitude less than previously proposed angular selective thermal emitters. We finally discuss the prospects of angular selectivity based on conic mirrors.

Conference Presentation

Citation Download Citation

Mohamed El Kabbash, Chunlei Guo, Wei Li, and Sandeep Chamoli "Angularly selective thermal emitters for robust and deep subfreezing daytime radiative cooling (Conference Presentation)", Proc. SPIE PC12195, Metamaterials, Metadevices, and Metasystems 2022, PC121950Q (3 October 2022); https://doi.org/10.1117/12.2638219

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