Radiative cooling by silicone-based coating with randomly distributed microbubble inclusions

Joseph D. Alden; Sarun Atiganyanun; Robert Vanderburg; Seung Ho Lee; John B. Plumley; Omar K. Abudayyeh; Sang M. Han; Sang Eon Han

doi:10.1117/1.JPE.9.032705

5 January 2019 Radiative cooling by silicone-based coating with randomly distributed microbubble inclusions

Joseph D. Alden, Sarun Atiganyanun, Robert Vanderburg, Seung Ho Lee, John B. Plumley, Omar K. Abudayyeh, Sang M. Han, Sang Eon Han

Author Affiliations +

Journal of Photonics for Energy, Vol. 9, Issue 3, 032705 (January 2019). https://doi.org/10.1117/1.JPE.9.032705

Abstract

We demonstrate that white coatings consisting of silicone embedded with randomly distributed microbubbles provide highly efficient daytime radiative cooling with inexpensive materials and fabrication processes. In our material system, sunlight is strongly scattered with minimal absorption, and heat is effectively removed through mid-infrared (IR) radiation. In our previous study, solid microsphere-based coatings outperformed commercial solar-rejection white paint in cooling efficiency, but their mechanical robustness needed improvement for practical applications. The material system in our work substantially enhances the mechanical robustness while providing superior cooling performance to commercial solar-rejection paint. For ease of processing, we use nonoptimized structures with reduced optical scattering strength. Strong solar rejection is yet achieved by increasing coating thickness. This strategy is desirable for practical rooftop applications where coating thickness is of minor importance in comparison to cooling performance and materials cost. In addition, silicone is stable in extraterrestrial environments and efficiently radiates heat over broad mid-IR spectrum. These material properties of our silicone coatings promise great potential for radiative cooling in space applications.

Citation Download Citation

Joseph D. Alden, Sarun Atiganyanun, Robert Vanderburg, Seung Ho Lee, John B. Plumley, Omar K. Abudayyeh, Sang M. Han, and Sang Eon Han "Radiative cooling by silicone-based coating with randomly distributed microbubble inclusions," Journal of Photonics for Energy 9(3), 032705 (5 January 2019). https://doi.org/10.1117/1.JPE.9.032705

Received: 24 September 2018; Accepted: 5 December 2018; Published: 5 January 2019

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