Design of efficient radiative emission and daytime cooling structures with Si3N4 and SiO2 nanoparticle laminate films
Abstract
Research on radiative cooling has attracted recent widespread interest owing to the potential for low-cost passive structures to enable large-scale thermal energy management. Using a generalized effective medium theory, we theoretically show that two-layer films comprised of SiO2 and Si3N4 nanoparticle layers on an Ag back reflector exhibit superior radiative cooling compared to single-layer or two-layer dense solid films, and can outperform other reported designs. The performance enhancement is a result of the ability to tune the nanoparticle fill fraction, which improves the spectral match between emissivity of this structure and the atmospheric transmission window. We also propose a standardized method for comparing the performance of radiative cooling structures reported by the research community.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Nov 10, 2020
- Source ID
- 10.1364/oe.408845
Entities
People
- Harry Atwater
- Magel Su
- Parker Wray
Organizations
- Army Research Office