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Article: Daytime passive radiative cooling by ultra emissive bio-inspired polymeric surface

TitleDaytime passive radiative cooling by ultra emissive bio-inspired polymeric surface
Authors
KeywordsGradient refractive index
Mie-scattering
Radiative cooling
Saharan silver ant
Selective emission
Issue Date2020
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/solmat
Citation
Solar Energy Materials & Solar Cells, 2020, v. 206, article no. 110296 How to Cite?
AbstractSaharan silver ants can maintain their body temperature below ambient air due to unique triangular shaped hairs that enhance solar reflection and thermal emission through a transparent window that lies in the atmosphere. Applying this thermoregulatory prismatic structure to polydimethylsiloxane (PDMS), highly emsissive in the 8–13 μm spectrum, we present a geometrically modified polymer-based daytime passive radiative cooler. The selective thermal emitter was fabricated based on the optimized prismatic structure from Finite Difference Time Domain (FDTD) simulations. The average emissivity within the 8–13 μm spectrum was enhanced to 0.98 by the gradient refractive index effect, while the average solar reflectivity in the visible and near-infrared spectrum was measured to be 0.95. The net radiative cooling power is estimated to reach 144 W/m2, exceeding records of previously reported radiative coolers. Last, in Hong Kong's hot and humid climate, a field test successfully demonstrated cooling by 6.2 °C below the temperature of ambient air corresponding to a net cooling power of 19.7 W/m2 in a non-vacuum setup during the peak daytime with shading. This is the largest temperature reduction observed in a tropical region for daytime passive radiative cooling. Our work presents an alternative method to enhance passive thermal emission and may facilitate its world wide application in eco-friendly space cooling.
Persistent Identifierhttp://hdl.handle.net/10722/289127
ISSN
2023 Impact Factor: 6.3
2023 SCImago Journal Rankings: 1.384
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorJeong, SY-
dc.contributor.authorTso, CY-
dc.contributor.authorWong, YM-
dc.contributor.authorChao, CYH-
dc.contributor.authorHuang, B-
dc.date.accessioned2020-10-22T08:08:12Z-
dc.date.available2020-10-22T08:08:12Z-
dc.date.issued2020-
dc.identifier.citationSolar Energy Materials & Solar Cells, 2020, v. 206, article no. 110296-
dc.identifier.issn0927-0248-
dc.identifier.urihttp://hdl.handle.net/10722/289127-
dc.description.abstractSaharan silver ants can maintain their body temperature below ambient air due to unique triangular shaped hairs that enhance solar reflection and thermal emission through a transparent window that lies in the atmosphere. Applying this thermoregulatory prismatic structure to polydimethylsiloxane (PDMS), highly emsissive in the 8–13 μm spectrum, we present a geometrically modified polymer-based daytime passive radiative cooler. The selective thermal emitter was fabricated based on the optimized prismatic structure from Finite Difference Time Domain (FDTD) simulations. The average emissivity within the 8–13 μm spectrum was enhanced to 0.98 by the gradient refractive index effect, while the average solar reflectivity in the visible and near-infrared spectrum was measured to be 0.95. The net radiative cooling power is estimated to reach 144 W/m2, exceeding records of previously reported radiative coolers. Last, in Hong Kong's hot and humid climate, a field test successfully demonstrated cooling by 6.2 °C below the temperature of ambient air corresponding to a net cooling power of 19.7 W/m2 in a non-vacuum setup during the peak daytime with shading. This is the largest temperature reduction observed in a tropical region for daytime passive radiative cooling. Our work presents an alternative method to enhance passive thermal emission and may facilitate its world wide application in eco-friendly space cooling.-
dc.languageeng-
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/solmat-
dc.relation.ispartofSolar Energy Materials & Solar Cells-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.subjectGradient refractive index-
dc.subjectMie-scattering-
dc.subjectRadiative cooling-
dc.subjectSaharan silver ant-
dc.subjectSelective emission-
dc.titleDaytime passive radiative cooling by ultra emissive bio-inspired polymeric surface-
dc.typeArticle-
dc.identifier.emailChao, CYH: cyhchao@hku.hk-
dc.identifier.authorityChao, CYH=rp02396-
dc.description.naturepostprint-
dc.identifier.doi10.1016/j.solmat.2019.110296-
dc.identifier.scopuseid_2-s2.0-85076572227-
dc.identifier.hkuros316086-
dc.identifier.volume206-
dc.identifier.spagearticle no. 110296-
dc.identifier.epagearticle no. 110296-
dc.identifier.isiWOS:000519653800035-
dc.publisher.placeNetherlands-
dc.identifier.issnl0927-0248-

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