Passive directional sub-ambient daytime radiative cooling
Demonstrations of passive daytime radiative cooling have primarily relied on complex and costly spectrally selective nanophotonic structures with high emissivity in the transparent atmospheric spectral window and high reflectivity in the solar spectrum. Here, we show a directional approach to passiv...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
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Nature Publishing Group
2019
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| Online Access: | http://hdl.handle.net/1721.1/120017 https://orcid.org/0000-0003-1537-3080 https://orcid.org/0000-0001-7773-3657 https://orcid.org/0000-0002-7512-3756 https://orcid.org/0000-0002-8865-859X https://orcid.org/0000-0001-5476-6368 https://orcid.org/0000-0002-7233-3918 https://orcid.org/0000-0002-7184-5831 https://orcid.org/0000-0001-7045-1200 |
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| author | Bhatia, Bikramjit S Leroy, Arny Shen, Yichen Zhao, Lin Gianello, Melissa F. Li, Duanhui Gu, Tian Hu, Juejun Soljacic, Marin Wang, Evelyn |
| author2 | Massachusetts Institute of Technology. Institute for Soldier Nanotechnologies |
| author_facet | Massachusetts Institute of Technology. Institute for Soldier Nanotechnologies Bhatia, Bikramjit S Leroy, Arny Shen, Yichen Zhao, Lin Gianello, Melissa F. Li, Duanhui Gu, Tian Hu, Juejun Soljacic, Marin Wang, Evelyn |
| author_sort | Bhatia, Bikramjit S |
| collection | MIT |
| description | Demonstrations of passive daytime radiative cooling have primarily relied on complex and costly spectrally selective nanophotonic structures with high emissivity in the transparent atmospheric spectral window and high reflectivity in the solar spectrum. Here, we show a directional approach to passive radiative cooling that exploits the angular confinement of solar irradiation in the sky to achieve sub-ambient cooling during the day regardless of the emitter properties in the solar spectrum. We experimentally demonstrate this approach using a setup comprising a polished aluminum disk that reflects direct solar irradiation and a white infrared-transparent polyethylene convection cover that minimizes diffuse solar irradiation. Measurements performed around solar noon show a minimum temperature of 6 °C below ambient temperature and maximum cooling power of 45 W m–2. Our passive cooling approach, realized using commonly available low-cost materials, could improve the performance of existing cooling systems and enable next-generation thermal management and refrigeration solutions. |
| first_indexed | 2024-09-23T14:12:29Z |
| format | Article |
| id | mit-1721.1/120017 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T14:12:29Z |
| publishDate | 2019 |
| publisher | Nature Publishing Group |
| record_format | dspace |
| spelling | mit-1721.1/1200172022-09-28T19:11:54Z Passive directional sub-ambient daytime radiative cooling Bhatia, Bikramjit S Leroy, Arny Shen, Yichen Zhao, Lin Gianello, Melissa F. Li, Duanhui Gu, Tian Hu, Juejun Soljacic, Marin Wang, Evelyn Massachusetts Institute of Technology. Institute for Soldier Nanotechnologies Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology. Department of Materials Science and Engineering Massachusetts Institute of Technology. Department of Mechanical Engineering Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Materials Systems Laboratory Massachusetts Institute of Technology. Research Laboratory of Electronics Bhatia, Bikramjit S Leroy, Arny Shen, Yichen Zhao, Lin Gianello, Melissa F. Li, Duanhui Gu, Tian Hu, Juejun Soljacic, Marin Wang, Evelyn Demonstrations of passive daytime radiative cooling have primarily relied on complex and costly spectrally selective nanophotonic structures with high emissivity in the transparent atmospheric spectral window and high reflectivity in the solar spectrum. Here, we show a directional approach to passive radiative cooling that exploits the angular confinement of solar irradiation in the sky to achieve sub-ambient cooling during the day regardless of the emitter properties in the solar spectrum. We experimentally demonstrate this approach using a setup comprising a polished aluminum disk that reflects direct solar irradiation and a white infrared-transparent polyethylene convection cover that minimizes diffuse solar irradiation. Measurements performed around solar noon show a minimum temperature of 6 °C below ambient temperature and maximum cooling power of 45 W m–2. Our passive cooling approach, realized using commonly available low-cost materials, could improve the performance of existing cooling systems and enable next-generation thermal management and refrigeration solutions. United States. Department of Energy. Office of Basic Energy Science (Award No. DE-SC0001299/DE-FG02- 09ER46577) Masdar Institute of Science and Technology (Reference 02/MI/MIT/CP/11/07633/GEN/G/00) 2019-01-14T13:21:52Z 2019-01-14T13:21:52Z 18-11 2019-01-10T17:53:35Z Article http://purl.org/eprint/type/JournalArticle 2041-1723 http://hdl.handle.net/1721.1/120017 Bhatia, Bikram, Arny Leroy, Yichen Shen, Lin Zhao, Melissa Gianello, Duanhui Li, Tian Gu, Juejun Hu, Marin Soljačić, and Evelyn N. Wang. “Passive Directional Sub-Ambient Daytime Radiative Cooling.” Nature Communications 9, no. 1 (November 27, 2018). https://orcid.org/0000-0003-1537-3080 https://orcid.org/0000-0001-7773-3657 https://orcid.org/0000-0002-7512-3756 https://orcid.org/0000-0002-8865-859X https://orcid.org/0000-0001-5476-6368 https://orcid.org/0000-0002-7233-3918 https://orcid.org/0000-0002-7184-5831 https://orcid.org/0000-0001-7045-1200 http://dx.doi.org/10.1038/s41467-018-07293-9 Nature Communications Creative Commons Attribution 4.0 International license https://creativecommons.org/licenses/by/4.0/ application/pdf Nature Publishing Group Nature |
| spellingShingle | Bhatia, Bikramjit S Leroy, Arny Shen, Yichen Zhao, Lin Gianello, Melissa F. Li, Duanhui Gu, Tian Hu, Juejun Soljacic, Marin Wang, Evelyn Passive directional sub-ambient daytime radiative cooling |
| title | Passive directional sub-ambient daytime radiative cooling |
| title_full | Passive directional sub-ambient daytime radiative cooling |
| title_fullStr | Passive directional sub-ambient daytime radiative cooling |
| title_full_unstemmed | Passive directional sub-ambient daytime radiative cooling |
| title_short | Passive directional sub-ambient daytime radiative cooling |
| title_sort | passive directional sub ambient daytime radiative cooling |
| url | http://hdl.handle.net/1721.1/120017 https://orcid.org/0000-0003-1537-3080 https://orcid.org/0000-0001-7773-3657 https://orcid.org/0000-0002-7512-3756 https://orcid.org/0000-0002-8865-859X https://orcid.org/0000-0001-5476-6368 https://orcid.org/0000-0002-7233-3918 https://orcid.org/0000-0002-7184-5831 https://orcid.org/0000-0001-7045-1200 |
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