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Adv Sci (Weinh). 2015 May 26;2(9):1500119. eCollection 2015 Sep.

A Subambient Open Roof Surface under the Mid-Summer Sun.

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School of Physics and Advanced Materials University of Technology Sydney PO Box 123 Broadway NSW 2007 Australia.


A novel material open to warm air stays below ambient temperature under maximum solar intensities of mid-summer. It is found to be 11 °C cooler than a commercial white cool roof nearby. A combination of specially chosen polymers and a silver thin film yields values near 100% for both solar reflectance, and thermal emittance at infrared wavelengths from 7.9 to 13 μm.


albedo; cool roofs; polymer stacks; sky cooling; urban heat islands

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