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A Multilayer Emitter Close to Ideal Solar Reflectance for Efficient Daytime Radiative Cooling
Yeqing Zhu1,2, Dong Wang1, Cheng Fang1
1Department of Physics, Nanjing Normal University, Nanjing 210023, China.
Polymers
|July 21, 2019
Summary
This study presents a multilayer thin film for passive daytime radiative cooling. The material effectively cools surfaces by reflecting sunlight and emitting heat, achieving significant temperature reduction without energy input.
Area of Science:
- Materials Science
- Thermodynamics
- Optics
Background:
- Passive radiative cooling offers energy-free thermal management.
- Developing efficient materials for daytime radiative cooling is crucial.
Purpose of the Study:
- To demonstrate a multilayer thin film structure for passive daytime radiative cooling.
- To experimentally and theoretically analyze its cooling performance.
Main Methods:
- Fabrication of multilayer thin films using physical vapor deposition and spin-coating.
- Experimental characterization using spectrometers.
- On-site performance evaluation under solar radiation.
- Theoretical simulations of cooling performance.
Main Results:
- The thin film structure exhibits high solar reflectance.
- Achieved an average temperature reduction of 12.6 °C under direct solar radiation (AM1.5).
- Cooling performance improves with increasing ambient air temperature.
- Demonstrated cooling capability even under nonideal atmospheric conditions.
Conclusions:
- The developed multilayer thin film is effective for passive daytime radiative cooling.
- The material shows potential for practical thermal management applications.
- Further optimization can enhance cooling efficiency.
Keywords:
cooling performancedaytime radiative coolingemissivitysolar reflectancethermal-radiationthin filmMore Related Videos
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