Ultrahigh passive cooling power in hydrogel with rationally designed optofluidic properties
The cooling power of a radiative cooler is more than halved in the tropics, e.g., Singapore, because of its harsh weather conditions including high humidity (84% on average), strong downward atmospheric radiation (∼40% higher than elsewhere), abundant rainfall, and intense solar radiation (up to 120...
| Main Authors: | , , , , , , , , , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/173574 |
| _version_ | 1826127909136367616 |
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| author | Fei, Jipeng Han, Di Zhang, Xuan Li, Ke Lavielle, Nicolas Zhou, Kai Wang, Xingli Tan, Jun Yan Zhong, Jianwei Wan, Man Pun Nefzaoui, Elyes Bourouina, Tarik Li, Shuzhou Ng, Bing Feng Cai, Lili Li, Hong |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Fei, Jipeng Han, Di Zhang, Xuan Li, Ke Lavielle, Nicolas Zhou, Kai Wang, Xingli Tan, Jun Yan Zhong, Jianwei Wan, Man Pun Nefzaoui, Elyes Bourouina, Tarik Li, Shuzhou Ng, Bing Feng Cai, Lili Li, Hong |
| author_sort | Fei, Jipeng |
| collection | NTU |
| description | The cooling power of a radiative cooler is more than halved in the tropics, e.g., Singapore, because of its harsh weather conditions including high humidity (84% on average), strong downward atmospheric radiation (∼40% higher than elsewhere), abundant rainfall, and intense solar radiation (up to 1200 W/m2 with ∼58% higher UV irradiation). So far, there has been no report of daytime radiative cooling that well achieves effective subambient cooling. Herein, through integrated passive cooling strategies in a hydrogel with desirable optofluidic properties, we demonstrate stable subambient (4–8 °C) cooling even under the strongest solar radiation in Singapore. The integrated passive cooler achieves an ultrahigh cooling power of ∼350 W/m2, 6–10 times higher than a radiative cooler in a tropical climate. An in situ study of radiative cooling with various hydration levels and ambient humidity is conducted to understand the interaction between radiation and evaporative cooling. This work provides insights for the design of an integrated cooler for various climates. |
| first_indexed | 2024-10-01T07:16:15Z |
| format | Journal Article |
| id | ntu-10356/173574 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:16:15Z |
| publishDate | 2024 |
| record_format | dspace |
| spelling | ntu-10356/1735742024-02-17T16:49:00Z Ultrahigh passive cooling power in hydrogel with rationally designed optofluidic properties Fei, Jipeng Han, Di Zhang, Xuan Li, Ke Lavielle, Nicolas Zhou, Kai Wang, Xingli Tan, Jun Yan Zhong, Jianwei Wan, Man Pun Nefzaoui, Elyes Bourouina, Tarik Li, Shuzhou Ng, Bing Feng Cai, Lili Li, Hong School of Mechanical and Aerospace Engineering School of Electrical and Electronic Engineering School of Materials Science and Engineering Institute of Materials Research and Engineering, A*STAR CNRS International NTU THALES Research Alliances Engineering The cooling power of a radiative cooler is more than halved in the tropics, e.g., Singapore, because of its harsh weather conditions including high humidity (84% on average), strong downward atmospheric radiation (∼40% higher than elsewhere), abundant rainfall, and intense solar radiation (up to 1200 W/m2 with ∼58% higher UV irradiation). So far, there has been no report of daytime radiative cooling that well achieves effective subambient cooling. Herein, through integrated passive cooling strategies in a hydrogel with desirable optofluidic properties, we demonstrate stable subambient (4–8 °C) cooling even under the strongest solar radiation in Singapore. The integrated passive cooler achieves an ultrahigh cooling power of ∼350 W/m2, 6–10 times higher than a radiative cooler in a tropical climate. An in situ study of radiative cooling with various hydration levels and ambient humidity is conducted to understand the interaction between radiation and evaporative cooling. This work provides insights for the design of an integrated cooler for various climates. Ministry of Education (MOE) Nanyang Technological University Submitted/Accepted version This work was supported by Nanyang Technological University under an NAP award (M408050000) and the Singapore Ministry of Education Tier 1 program (RG58/21 & RG97/18 (S)). 2024-02-16T00:36:50Z 2024-02-16T00:36:50Z 2024 Journal Article Fei, J., Han, D., Zhang, X., Li, K., Lavielle, N., Zhou, K., Wang, X., Tan, J. Y., Zhong, J., Wan, M. P., Nefzaoui, E., Bourouina, T., Li, S., Ng, B. F., Cai, L. & Li, H. (2024). Ultrahigh passive cooling power in hydrogel with rationally designed optofluidic properties. Nano Letters, 24(2), 623-631. https://dx.doi.org/10.1021/acs.nanolett.3c03694 1530-6984 https://hdl.handle.net/10356/173574 10.1021/acs.nanolett.3c03694 2 24 623 631 en M408050000 RG58/21 RG97/18 (S) Nano Letters © 2023 American Chemical Society. All rights reserved. This article may be downloaded for personal use only. Any other use requires prior permission of the copyright holder. The Version of Record is available online at http://doi.org/10.1021/acs.nanolett.3c03694. application/pdf |
| spellingShingle | Engineering Fei, Jipeng Han, Di Zhang, Xuan Li, Ke Lavielle, Nicolas Zhou, Kai Wang, Xingli Tan, Jun Yan Zhong, Jianwei Wan, Man Pun Nefzaoui, Elyes Bourouina, Tarik Li, Shuzhou Ng, Bing Feng Cai, Lili Li, Hong Ultrahigh passive cooling power in hydrogel with rationally designed optofluidic properties |
| title | Ultrahigh passive cooling power in hydrogel with rationally designed optofluidic properties |
| title_full | Ultrahigh passive cooling power in hydrogel with rationally designed optofluidic properties |
| title_fullStr | Ultrahigh passive cooling power in hydrogel with rationally designed optofluidic properties |
| title_full_unstemmed | Ultrahigh passive cooling power in hydrogel with rationally designed optofluidic properties |
| title_short | Ultrahigh passive cooling power in hydrogel with rationally designed optofluidic properties |
| title_sort | ultrahigh passive cooling power in hydrogel with rationally designed optofluidic properties |
| topic | Engineering |
| url | https://hdl.handle.net/10356/173574 |
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