<p>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 TiO<sub>2 </sub>nanoparticles, and we were able to achieve a partial
daytime radiative cooling effect of 60Wm<sup>-2</sup> Built upon our lab’s success
of full-daytime sub-ambient cooling based on BaSO<sub>4</sub>-acrylic paints,
we experiment with colored cooling paints based on BaSO<sub>4</sub> nanoparticles
instead of TiO<sub>2</sub> 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.</p>
| Identifer | oai:union.ndltd.org:purdue.edu/oai:figshare.com:article/12568007 |
| Date | 12 October 2021 |
| Creators | Peiyan Yao (9029216) |
| Source Sets | Purdue University |
| Detected Language | English |
| Type | Text, Thesis |
| Rights | CC BY 4.0 |
| Relation | https://figshare.com/articles/thesis/BASO4_NANOCOMPOSITE_COLOR_COOLING_PAINT_AND_BIO-INSPIRED_COOLING_METHOD/12568007 |
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