Abstract
Radiative cooling is a passive cooling strategy with zero consumption of electricity that can be used to radiate heat from buildings to reduce air-conditioning requirements. Although this technology can work well during optimal atmospheric conditions at night, it is essential to achieve efficient cooling during the daytime when peak cooling demand actually occurs. Here we report an inexpensive planar polydimethylsiloxane (PDMS)/metal thermal emitter thin film structure, which was fabricated using a fast solution coating process that is scalable for large-area manufacturing. By performing tests under different environmental conditions, temperature reductions of 9.5 °C and 11.0 °C were demonstrated in the laboratory and an outside environment, respectively, with an average cooling power of ~120 W m–2 for the thin film thermal emitter. In addition, a spectral-selective structure was designed and implemented to suppress the solar input and control the divergence of the thermal emission beam. This enhanced the directionality of the thermal emissions, so the emitter’s cooling performance was less dependent on the surrounding environment. Outside experiments were performed in Buffalo, New York, realizing continuous all-day cooling of ~2–9 °C on a typical clear sunny day at Northern United States latitudes. This practical strategy that cools without electricity input could have a significant impact on global energy consumption.
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Data availability
The data that support the findings of this study are available from the corresponding authors on request.
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Acknowledgements
This work was partially supported by the National Science Foundation (grant nos. IIP-1745846, ECCS-1507312, CBET-1445934 and ECCS-1425648).
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Q.G., B.O. and Z.Y conceived the idea and supervised the project. L.Z., H.S., J.L., E.S. and T.N. executed the experiments. All authors contributed to the analysis of the experimental results and modelling. L.Z., H.S., Z.Y., B.O. and Q.G. wrote the manuscript. All authors reviewed the manuscript.
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Q.G. and Z.Y. have founded a company, Sunny Clean Water LLC, seeking to commercialize the results reported in this paper.
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Supplementary Figs. 1–9, Notes 1–6 and Refs. 1–3
Supplementary Video 1
Short clip showing application of PDMS coating to metal.
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Zhou, L., Song, H., Liang, J. et al. A polydimethylsiloxane-coated metal structure for all-day radiative cooling. Nat Sustain 2, 718–724 (2019). https://doi.org/10.1038/s41893-019-0348-5
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DOI: https://doi.org/10.1038/s41893-019-0348-5
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