Design of Double‐Sided Optical Coatings for Space Cooling Through Vertical Windows
Passive radiative cooling is a promising energy‐saving strategy for space cooling. Dual‐sided thermal emitters offer efficient heat removal from enclosed spaces; however, existing studies predominantly focus on rooftop applications, with limited attention to vertical surfaces, such as walls and wind...
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| Format: | Article |
| Language: | English |
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Wiley-VCH
2025-06-01
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| Series: | Advanced Photonics Research |
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| Online Access: | https://doi.org/10.1002/adpr.202400205 |
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| author | Hyunkyu Kwak Do Hyeon Kim Young Min Song |
| author_facet | Hyunkyu Kwak Do Hyeon Kim Young Min Song |
| author_sort | Hyunkyu Kwak |
| collection | DOAJ |
| description | Passive radiative cooling is a promising energy‐saving strategy for space cooling. Dual‐sided thermal emitters offer efficient heat removal from enclosed spaces; however, existing studies predominantly focus on rooftop applications, with limited attention to vertical surfaces, such as walls and windows. Here, a dual‐sided radiative cooling glass (DSRCG) tailored for vertical applications proposed, enhancing enclosure cooling. The DSRCG incorporates multilayer epsilon‐near‐zero materials, including Al2O3 and Si3N4, layered on a double‐sided indium‐tin‐oxide‐coated glass. The outward side of the DSRCG exhibits angular‐selective emission for efficient heat dissipation, while the inward side minimizes thermal radiation into enclosures. The visibly transparent layers enable a visible transmittance exceeding 72%. The simulation results demonstrate that the DSRCG reduces heat transfer to enclosures by 15 W m−2 compared with the conventional glass (C‐glass) at ambient temperatures above 30 °C. These findings highlight the DSRCG's potential as an energy‐saving window for reducing space‐cooling energy usage. |
| format | Article |
| id | doaj-art-42724ceae8b74b2ba5d6a88bb26a9686 |
| institution | OA Journals |
| issn | 2699-9293 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | Wiley-VCH |
| record_format | Article |
| series | Advanced Photonics Research |
| spelling | doaj-art-42724ceae8b74b2ba5d6a88bb26a96862025-08-20T02:33:15ZengWiley-VCHAdvanced Photonics Research2699-92932025-06-0166n/an/a10.1002/adpr.202400205Design of Double‐Sided Optical Coatings for Space Cooling Through Vertical WindowsHyunkyu Kwak0Do Hyeon Kim1Young Min Song2School of Materials Science and Engineering Gwangju Institute of Science and Technology Cheomdangwagi‐ro 123, Buk‐gu Gwangju 61005 Republic of KoreaSchool of Electrical Engineering and Computer Science Gwangju Institute of Science and Technology Cheomdangwagi‐ro 123, Buk‐gu Gwangju 61005 Republic of KoreaSchool of Electrical Engineering and Computer Science Gwangju Institute of Science and Technology Cheomdangwagi‐ro 123, Buk‐gu Gwangju 61005 Republic of KoreaPassive radiative cooling is a promising energy‐saving strategy for space cooling. Dual‐sided thermal emitters offer efficient heat removal from enclosed spaces; however, existing studies predominantly focus on rooftop applications, with limited attention to vertical surfaces, such as walls and windows. Here, a dual‐sided radiative cooling glass (DSRCG) tailored for vertical applications proposed, enhancing enclosure cooling. The DSRCG incorporates multilayer epsilon‐near‐zero materials, including Al2O3 and Si3N4, layered on a double‐sided indium‐tin‐oxide‐coated glass. The outward side of the DSRCG exhibits angular‐selective emission for efficient heat dissipation, while the inward side minimizes thermal radiation into enclosures. The visibly transparent layers enable a visible transmittance exceeding 72%. The simulation results demonstrate that the DSRCG reduces heat transfer to enclosures by 15 W m−2 compared with the conventional glass (C‐glass) at ambient temperatures above 30 °C. These findings highlight the DSRCG's potential as an energy‐saving window for reducing space‐cooling energy usage.https://doi.org/10.1002/adpr.202400205directional emissionsepsilon near zerosJanus emissionspassive radiative coolingspace coolingthermal managements |
| spellingShingle | Hyunkyu Kwak Do Hyeon Kim Young Min Song Design of Double‐Sided Optical Coatings for Space Cooling Through Vertical Windows Advanced Photonics Research directional emissions epsilon near zeros Janus emissions passive radiative cooling space cooling thermal managements |
| title | Design of Double‐Sided Optical Coatings for Space Cooling Through Vertical Windows |
| title_full | Design of Double‐Sided Optical Coatings for Space Cooling Through Vertical Windows |
| title_fullStr | Design of Double‐Sided Optical Coatings for Space Cooling Through Vertical Windows |
| title_full_unstemmed | Design of Double‐Sided Optical Coatings for Space Cooling Through Vertical Windows |
| title_short | Design of Double‐Sided Optical Coatings for Space Cooling Through Vertical Windows |
| title_sort | design of double sided optical coatings for space cooling through vertical windows |
| topic | directional emissions epsilon near zeros Janus emissions passive radiative cooling space cooling thermal managements |
| url | https://doi.org/10.1002/adpr.202400205 |
| work_keys_str_mv | AT hyunkyukwak designofdoublesidedopticalcoatingsforspacecoolingthroughverticalwindows AT dohyeonkim designofdoublesidedopticalcoatingsforspacecoolingthroughverticalwindows AT youngminsong designofdoublesidedopticalcoatingsforspacecoolingthroughverticalwindows |