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- Title
A Pragmatic Bilayer Selective Emitter for Efficient Radiative Cooling under Direct Sunlight.
- Authors
Liu, Yiwei; Bai, Anqi; Fang, Zhenggang; Ni, Yaru; Lu, Chunhua; Xu, Zhongzi
- Abstract
Radiative cooling can make the selective emitter cool below ambient temperature without any external energy. Recent advances in photonic crystal and metamaterial technology made a high-efficiency selective emitter achievable by precisely controlling the emitter's Infrared emission spectrum. However, the high cost of the photonic crystals and meta-materials limit their application. Herein, an efficient bilayer selective emitter is prepared based on the molecular vibrations of functional nanoparticles. By optimizing the volume fraction of the functional nanoparticles, the bilayer selective emitter can theoretically cool 36.7 °C and 25.5 °C below the ambient temperature in the nighttime and daytime, respectively. Such an efficient cooling performance is comparable with the published photonic crystal and metamaterial selective emitters. The rooftop measurements show that the bilayer selective emitter is effective in the ambient air even under direct sunlight. The relatively low cost and excellent cooling performance enable the bilayer selective emitter to have great potential for a practical purpose.
- Subjects
RADIATIVE transfer; SELECTIVE catalytic oxidation; PHOTONIC crystals; METAMATERIALS; MOLECULAR vibrational spectra
- Publication
Materials (1996-1944), 2019, Vol 12, Issue 8, p1208
- ISSN
1996-1944
- Publication type
Article
- DOI
10.3390/ma12081208