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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2022
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2207.10957 |
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| _version_ | 1866910014695800832 |
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| author | Huang, Tianzhe Chen, Qixiang Huang, Jinhua Lu, Yuehui Xu, Hua Zhao, Meng Xu, Yao Song, Weijie |
| author_facet | Huang, Tianzhe Chen, Qixiang Huang, Jinhua Lu, Yuehui Xu, Hua Zhao, Meng Xu, Yao Song, Weijie |
| contents | Daytime radiative coolers cool objects below the air temperature without any electricity input, while most of them are limited by a silvery or whitish appearance. Colored daytime radiative coolers (CDRCs) with diverse colors, scalable manufacture, and sub-ambient cooling have not been achieved. We introduce a polymer-Tamm photonic structure to enable a high infrared emittance and an engineered absorbed solar irradiance, governed by the quality factor (Q-factor). We theoretically determine the theoretical thresholds for sub-ambient cooling through yellow, magenta, and cyan CDRCs. We experimentally fabricate and observe a temperature drop of 2.6-8.8 degrees Celsius on average during daytime and 4.0-4.4degrees Celsius during nighttime. Furthermore, we demonstrate a scalable-manufactured magenta CDRC with a width of 60 cm and a length of 500 cm by a roll-to-roll deposition technique. This work provides guidelines for large-scale CDRCs and offers unprecedented opportunities for potential applications with energy-saving, aesthetic, and visual comfort demands. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2207_10957 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Scalable colored sub-ambient radiative coolers based on a polymer-Tamm photonic structure Huang, Tianzhe Chen, Qixiang Huang, Jinhua Lu, Yuehui Xu, Hua Zhao, Meng Xu, Yao Song, Weijie Optics Applied Physics Daytime radiative coolers cool objects below the air temperature without any electricity input, while most of them are limited by a silvery or whitish appearance. Colored daytime radiative coolers (CDRCs) with diverse colors, scalable manufacture, and sub-ambient cooling have not been achieved. We introduce a polymer-Tamm photonic structure to enable a high infrared emittance and an engineered absorbed solar irradiance, governed by the quality factor (Q-factor). We theoretically determine the theoretical thresholds for sub-ambient cooling through yellow, magenta, and cyan CDRCs. We experimentally fabricate and observe a temperature drop of 2.6-8.8 degrees Celsius on average during daytime and 4.0-4.4degrees Celsius during nighttime. Furthermore, we demonstrate a scalable-manufactured magenta CDRC with a width of 60 cm and a length of 500 cm by a roll-to-roll deposition technique. This work provides guidelines for large-scale CDRCs and offers unprecedented opportunities for potential applications with energy-saving, aesthetic, and visual comfort demands. |
| title | Scalable colored sub-ambient radiative coolers based on a polymer-Tamm photonic structure |
| topic | Optics Applied Physics |
| url | https://arxiv.org/abs/2207.10957 |