Fully Organic and Flexible Biodegradable Emitter for Global Energy-Free Cooling Applications
- Authors
- Park, Chanil; Park, Choyeon; Nie, Xiao; Lee, Jaeho; Kim, Yong Seok; Yoo, Youngjae
- Issue Date
- May-2022
- Publisher
- AMER CHEMICAL SOC
- Keywords
- passive radiative cooling; thermal emitter; energy saving; biodegradable polymer; hierarchically porous structure
- Citation
- ACS SUSTAINABLE CHEMISTRY & ENGINEERING, v.10, no.21, pp 7091 - 7099
- Pages
- 9
- Journal Title
- ACS SUSTAINABLE CHEMISTRY & ENGINEERING
- Volume
- 10
- Number
- 21
- Start Page
- 7091
- End Page
- 7099
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/58531
- DOI
- 10.1021/acssuschemeng.2c01182
- ISSN
- 2168-0485
- Abstract
- In recent years, many researchers believe that global energy consumption can be significantly reduced by passive daytime radiative cooling (PDRC) without any electricity input. Over a decade, PDRC has been developed to enhance solar reflectivity and emissivity in the long-wavelength infrared (LWIR) region; however, sustainable materials for radiative cooling have not been sufficiently investigated. In the present study, the preparation of an eco-friendly polymer structure for effective radiative cooling via thermally induced phase separation is described. The as-fabricated radiative cooler exhibits reasonable durability for application to buildings, and furthermore, biodegradable polylactic acid (PLA) is environmentally benign with respect to end-of-life disposal. Moreover, the hierarchically porous PLA exhibits a solar reflectivity of 0.91 and an LWIR emissivity of 0.92, thus realizing high-performance passive radiative cooling without a silver coating for solar reflection. In addition, a radiative cooling power of 117 W m(-2) is achieved under direct sunlight, and the porous PLA cooled as much as 9 degrees C below the ambient temperature. This cooling effect is the highest among all organic-based passive radiation cooling emitters reported so far. The present work provides an ideal passive radiative cooling strategy for creating environmentally friendly buildings with reduced energy consumption.
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