Angular selective broadband radiative cooling based on Berreman mode
Dong Gyun Ryu, June Tae Kim, Min Seong Kim, Jeong Jin Kim, Hee Jun Nam, Ik Hoon Jeong, Yeong Jae Kim, Gil Ju Lee
Abstract
Conventional radiative coolers (RCs) exhibit excellent cooling performance in horizontally-installed scenarios but are mainly limited to roofing materials due to their emitting direction. To increase the availability of RC application on the area of a building facade, this article proposes an oblique radiation-angled photonic structure (ORAPS). ORAPS can facilitate thermal emission toward the outer space, evade the adjacent building, and reflect incoming radiative heat in a direction perpendicular to the panel. Along with the theoretical basis of designing the structure, we present simulation-based cooling performance analyses for diverse environmental parameters. This demonstrates that an ORAPS is useful not only for densely packed megacities but also for thermoregulation during the winter season.