Angularly selective thermal emitters for deep subfreezing daytime radiative cooling.

ABSTRACT: We theoretically analyze the impact of angular selectivity on the radiative cooling performance of thermal emitters. We investigate the effect of spectral selectivity, environmental conditions, and parasitic heating on the minimum possible equilibrium temperature of the thermal emitter. We show that combining angular and spectral selectivity is necessary to reach deep subfreezing temperatures. We also show that angularly selective thermal emitters increase the cooling performance in humid environments, however, they require management of nonradiative heat transfer processes. We introduce a general scheme to realize angularly and spectrally selective absorption/emission using a thin film stack consisting of an angle dependent transmission filter overlayed on a selective thermal emitter. The

SUBMITTER: Chamoli SK 

PROVIDER: S-EPMC11501671 | biostudies-literature | 2022 Sep

REPOSITORIES: biostudies-literature