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Highly efficient evaporative cooling by all-day water evaporation using hierarchically porous biomass SCIE SCOPUS

Title
Highly efficient evaporative cooling by all-day water evaporation using hierarchically porous biomass
Authors
Choi, JihunLEE, HANSOLSohn, BokyeongSONG, MINJAEJeon, Sangmin
Date Issued
2021-08
Publisher
NATURE PORTFOLIO
Abstract
We developed a 3D solar steam generator with the highest evaporation rate reported so far using a carbonized luffa sponge (CLS). The luffa sponge consisted of entangled fibers with a hierarchically porous structure; macropores between fibers, micro-sized pores in the fiber-thickness direction, and microchannels in the fiber-length direction. This structure remained after carbonization and played an important role in water transport. When the CLS was placed in the water, the microchannels in the fiber-length direction transported water to the top surface of the CLS by capillary action, and the micro-sized pores in the fiber-thickness direction delivered water to the entire fiber surface. The water evaporation rate under 1-sun illumination was 3.7 kg/m(2)/h, which increased to 14.5 kg/m(2)/h under 2 m/s wind that corresponded to the highest evaporation rate ever reported under the same condition. The high evaporation performance of the CLS was attributed to its hierarchically porous structure. In addition, it was found that the air temperature dropped by 3.6 degrees C when the wind passed through the CLS because of the absorption of the latent heat of vaporization. The heat absorbed by the CLS during water evaporation was calculated to be 9.7 kW/m(2) under 1-sun illumination and 2 m/s wind, which was 10 times higher than the solar energy irradiated on the same area (1 kW/m(2)).
URI
https://oasis.postech.ac.kr/handle/2014.oak/113045
DOI
10.1038/s41598-021-96303-w
ISSN
2045-2322
Article Type
Article
Citation
SCIENTIFIC REPORTS, vol. 11, no. 1, 2021-08
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전상민JEON, SANGMIN
Dept. of Chemical Enginrg
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