Highly solar reflectance and infrared transparent porous coating for non-contact heat dissipations
Summary: Passive daytime radiative cooling (PDRC) can dissipate heat to outer space with high solar reflectance (R¯solar) and thermal emittance (ε¯LWIR) in the atmospheric transmission window. However, for the non-contact heat dissipation, besides the high R¯solar, a high infrared transmittance (τ¯L...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-08-01
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| Series: | iScience |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2589004222009981 |
| _version_ | 1811294172989095936 |
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| author | Meijie Chen Dan Pang Hongjie Yan |
| author_facet | Meijie Chen Dan Pang Hongjie Yan |
| author_sort | Meijie Chen |
| collection | DOAJ |
| description | Summary: Passive daytime radiative cooling (PDRC) can dissipate heat to outer space with high solar reflectance (R¯solar) and thermal emittance (ε¯LWIR) in the atmospheric transmission window. However, for the non-contact heat dissipation, besides the high R¯solar, a high infrared transmittance (τ¯LWIR) is needed to directly emit thermal radiation through the IR-transparent coating to outer space. In this work, An IR-transparent porous PE (P-PE) coating with R¯solar= 0.96 and τ¯LWIR= 0.88 was prepared for non-contact heat dissipations. Under the direct sunlight of 860 W m−2, the IR-transparent coating obtained a 4°C lower heater temperature than the normal PDRC coating under the same condition. In addition, the spectral reflectance of the P-PE coating after immersing in air or water changed little, which showed excellent durability for long-term outdoor applications. These results indicate the P-PE coating can be a potential IR-transparent coating for non-contact heat dissipations under direct sunlight. |
| first_indexed | 2024-04-13T05:12:33Z |
| format | Article |
| id | doaj.art-169b8e6d609e4163a3ce73e099eb0f04 |
| institution | Directory Open Access Journal |
| issn | 2589-0042 |
| language | English |
| last_indexed | 2024-04-13T05:12:33Z |
| publishDate | 2022-08-01 |
| publisher | Elsevier |
| record_format | Article |
| series | iScience |
| spelling | doaj.art-169b8e6d609e4163a3ce73e099eb0f042022-12-22T03:00:59ZengElsevieriScience2589-00422022-08-01258104726Highly solar reflectance and infrared transparent porous coating for non-contact heat dissipationsMeijie Chen0Dan Pang1Hongjie Yan2School of Energy Science and Engineering, Central South University, Changsha 410083, China; Corresponding authorSchool of Energy Science and Engineering, Central South University, Changsha 410083, ChinaSchool of Energy Science and Engineering, Central South University, Changsha 410083, China; Corresponding authorSummary: Passive daytime radiative cooling (PDRC) can dissipate heat to outer space with high solar reflectance (R¯solar) and thermal emittance (ε¯LWIR) in the atmospheric transmission window. However, for the non-contact heat dissipation, besides the high R¯solar, a high infrared transmittance (τ¯LWIR) is needed to directly emit thermal radiation through the IR-transparent coating to outer space. In this work, An IR-transparent porous PE (P-PE) coating with R¯solar= 0.96 and τ¯LWIR= 0.88 was prepared for non-contact heat dissipations. Under the direct sunlight of 860 W m−2, the IR-transparent coating obtained a 4°C lower heater temperature than the normal PDRC coating under the same condition. In addition, the spectral reflectance of the P-PE coating after immersing in air or water changed little, which showed excellent durability for long-term outdoor applications. These results indicate the P-PE coating can be a potential IR-transparent coating for non-contact heat dissipations under direct sunlight.http://www.sciencedirect.com/science/article/pii/S2589004222009981Energy sustainabilityThermal engineeringThermal property |
| spellingShingle | Meijie Chen Dan Pang Hongjie Yan Highly solar reflectance and infrared transparent porous coating for non-contact heat dissipations iScience Energy sustainability Thermal engineering Thermal property |
| title | Highly solar reflectance and infrared transparent porous coating for non-contact heat dissipations |
| title_full | Highly solar reflectance and infrared transparent porous coating for non-contact heat dissipations |
| title_fullStr | Highly solar reflectance and infrared transparent porous coating for non-contact heat dissipations |
| title_full_unstemmed | Highly solar reflectance and infrared transparent porous coating for non-contact heat dissipations |
| title_short | Highly solar reflectance and infrared transparent porous coating for non-contact heat dissipations |
| title_sort | highly solar reflectance and infrared transparent porous coating for non contact heat dissipations |
| topic | Energy sustainability Thermal engineering Thermal property |
| url | http://www.sciencedirect.com/science/article/pii/S2589004222009981 |
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