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posted on 12.10.2021, 13:04 authored by Peiyan YaoPeiyan Yao

Radiative cooling is an approach that utilizes the material reflectance in solar spectrum to reflect solar irradiation and emit the energy to deep space (2.7K) through the transparent portion in atmosphere (8-13μm). Therefore, radiative cooling is a passive cooling method that can generate a large reduction in energy consumption in the cooling sector. Scientists have been researching on the best solution for passive radiative cooling, including the utilization of multi-layer techniques with a metallic base layer. However, the current solutions are usually not cost effective and thus limited in the commercial applications. We initially started with the experiment on single-layer cooling paints embedded with TiO2 nanoparticles, and we were able to achieve a partial daytime radiative cooling effect of 60Wm-2 Built upon our lab’s success of full-daytime sub-ambient cooling based on BaSO4-acrylic paints, we experiment with colored cooling paints based on BaSO4 nanoparticles instead of TiO2 nanoparticles. Our results show much enhanced solar reflectance while matching the color, indicating the potential for colored cooling paints, although outdoor tests have not shown significant temperature drop compared to commercial colored paints yet. At the same time, we also explore creatures with shells in nature for possible solutions. Seashells are collected and the microstructures and radiative properties are characterized. The results provide insights into bio-inspired radiative cooling solutions.


Degree Type

Master of Science in Mechanical Engineering


Mechanical Engineering

Campus location

West Lafayette

Advisor/Supervisor/Committee Chair


Additional Committee Member 2

Amy Marconnet

Additional Committee Member 3

Jong Hyun Choi