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

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 directi...

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Autores principales:	Jihun Choi, Hansol Lee, Bokyeong Sohn, Minjae Song, Sangmin Jeon
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/6d4072aac6314471b50ba22ac80f89d3
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spelling	oai:doaj.org-article:6d4072aac6314471b50ba22ac80f89d32021-12-02T17:08:36ZHighly efficient evaporative cooling by all-day water evaporation using hierarchically porous biomass10.1038/s41598-021-96303-w2045-2322https://doaj.org/article/6d4072aac6314471b50ba22ac80f89d32021-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-96303-whttps://doaj.org/toc/2045-2322Abstract 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/m2/h, which increased to 14.5 kg/m2/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 °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/m2 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/m2).Jihun ChoiHansol LeeBokyeong SohnMinjae SongSangmin JeonNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jihun Choi Hansol Lee Bokyeong Sohn Minjae Song Sangmin Jeon Highly efficient evaporative cooling by all-day water evaporation using hierarchically porous biomass
description	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/m2/h, which increased to 14.5 kg/m2/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 °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/m2 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/m2).
format	article
author	Jihun Choi Hansol Lee Bokyeong Sohn Minjae Song Sangmin Jeon
author_facet	Jihun Choi Hansol Lee Bokyeong Sohn Minjae Song Sangmin Jeon
author_sort	Jihun Choi
title	Highly efficient evaporative cooling by all-day water evaporation using hierarchically porous biomass
title_short	Highly efficient evaporative cooling by all-day water evaporation using hierarchically porous biomass
title_full	Highly efficient evaporative cooling by all-day water evaporation using hierarchically porous biomass
title_fullStr	Highly efficient evaporative cooling by all-day water evaporation using hierarchically porous biomass
title_full_unstemmed	Highly efficient evaporative cooling by all-day water evaporation using hierarchically porous biomass
title_sort	highly efficient evaporative cooling by all-day water evaporation using hierarchically porous biomass
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/6d4072aac6314471b50ba22ac80f89d3
work_keys_str_mv	AT jihunchoi highlyefficientevaporativecoolingbyalldaywaterevaporationusinghierarchicallyporousbiomass AT hansollee highlyefficientevaporativecoolingbyalldaywaterevaporationusinghierarchicallyporousbiomass AT bokyeongsohn highlyefficientevaporativecoolingbyalldaywaterevaporationusinghierarchicallyporousbiomass AT minjaesong highlyefficientevaporativecoolingbyalldaywaterevaporationusinghierarchicallyporousbiomass AT sangminjeon highlyefficientevaporativecoolingbyalldaywaterevaporationusinghierarchicallyporousbiomass
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Highly efficient evaporative cooling by all-day water evaporation using hierarchically porous biomass

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