Journal
ELIGHT
Volume 3, Issue 1, Pages -Publisher
SPRINGERNATURE
DOI: 10.1186/s43593-023-00053-3
Keywords
Radiative cooling; Metasurface; Roll-to-roll printing; Energy saving
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This study proposes and demonstrates a metasurface radiative cooler based on periodically arranged three-dimensional trench-like structures in a thin polymer layer, which exhibits excellent spectral control capability and efficient cooling performance. The cooler offers outstanding omnidirectional absorption/emission in the atmospheric transparency window, low solar absorption, and high stability, promising broad applications in energy saving and passive heat dispersion fields.
An ideal radiative cooler requires accurate spectral control capability to achieve efficient thermal emission in the atmospheric transparency window (8-13 mu m), low solar absorption, good stability, scalability, and a simple structure for effective diurnal radiative cooling. Flexible cooling films made from polymer relying on polymer intrinsic absorbance represent a cost-effective solution but lack accuracy in spectral control. Here, we propose and demonstrate a metasurface concept enabled by periodically arranged three-dimensional (3D) trench-like structures in a thin layer of polymer for high-performance radiative cooling. The structured polymer metasurface radiative cooler is manufactured by a roll-to-roll printing method. It exhibits superior spectral breadth and selectivity, which offers outstanding omnidirectional absorption/emission (96.1%) in the atmospheric transparency window, low solar absorption (4.8%), and high stability. Impressive cooling power of 129.8 W m-2 and temperature deduction of 7 degrees C on a clear sky midday have been achieved, promising broad practical applications in energy saving and passive heat dispersion fields.
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