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Article: Field investigation of a photonic multi-layered TiO2 passive radiative cooler in sub-tropical climate

TitleField investigation of a photonic multi-layered TiO2 passive radiative cooler in sub-tropical climate
Authors
KeywordsFDTD optimization
Multi-layer thin film
Photonic structure
Radiative cooling
Thermal radiation
Issue Date2020
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/renene
Citation
Renewable Energy, 2020, v. 146, p. 44-55 How to Cite?
AbstractCost reduction and enhanced cooling performance are strongly demanded for daytime passive radiative cooling due to its attractive cooling strategy that does not require any energy input. Its potential application varies widely from air conditioning systems for buildings, photovoltaic cells, electronic device cooling and automobiles. However, recently proposed daytime passive radiative coolers are based on photonic structures which are high in cost. A relatively cheap metal oxide material, TiO2, which lowers the cost but is highly emissive in the mid-infrared range has been used, also improving the cooling performance of the photonic daytime passive radiative cooler. An optimized TiO2–SiO2 alternating multi-layered photonic daytime radiative cooler with average emissivity of 0.84 within 8–13 μm while reflecting 94% of incident solar energy is developed. Its net cooling power is estimated to be 136.3 W/m2 at ambient air temperature of 27 °C which shows an improvement of 90 W/m2 compared to that of the HfO2-SiO2 photonic radiative cooler. Last, a field test has been conducted in Hong Kong's subtropical climate (i.e. relative humidity = 60–70%) to investigate its feasibility, and with the help of solar shading, successfully demonstrated temperature reduction of 7.2 °C with a net cooling power of 14.3 W/m2 under direct sunlight.
Persistent Identifierhttp://hdl.handle.net/10722/272218
ISSN
2017 Impact Factor: 4.9
2015 SCImago Journal Rankings: 1.961

 

DC FieldValueLanguage
dc.contributor.authorJeong, SY-
dc.contributor.authorTso, CY-
dc.contributor.authorHa, J-
dc.contributor.authorWong, YM-
dc.contributor.authorChao, CYH-
dc.contributor.authorHuang, B-
dc.contributor.authorQiu, H-
dc.date.accessioned2019-07-20T10:37:59Z-
dc.date.available2019-07-20T10:37:59Z-
dc.date.issued2020-
dc.identifier.citationRenewable Energy, 2020, v. 146, p. 44-55-
dc.identifier.issn0960-1481-
dc.identifier.urihttp://hdl.handle.net/10722/272218-
dc.description.abstractCost reduction and enhanced cooling performance are strongly demanded for daytime passive radiative cooling due to its attractive cooling strategy that does not require any energy input. Its potential application varies widely from air conditioning systems for buildings, photovoltaic cells, electronic device cooling and automobiles. However, recently proposed daytime passive radiative coolers are based on photonic structures which are high in cost. A relatively cheap metal oxide material, TiO2, which lowers the cost but is highly emissive in the mid-infrared range has been used, also improving the cooling performance of the photonic daytime passive radiative cooler. An optimized TiO2–SiO2 alternating multi-layered photonic daytime radiative cooler with average emissivity of 0.84 within 8–13 μm while reflecting 94% of incident solar energy is developed. Its net cooling power is estimated to be 136.3 W/m2 at ambient air temperature of 27 °C which shows an improvement of 90 W/m2 compared to that of the HfO2-SiO2 photonic radiative cooler. Last, a field test has been conducted in Hong Kong's subtropical climate (i.e. relative humidity = 60–70%) to investigate its feasibility, and with the help of solar shading, successfully demonstrated temperature reduction of 7.2 °C with a net cooling power of 14.3 W/m2 under direct sunlight.-
dc.languageeng-
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/renene-
dc.relation.ispartofRenewable Energy-
dc.subjectFDTD optimization-
dc.subjectMulti-layer thin film-
dc.subjectPhotonic structure-
dc.subjectRadiative cooling-
dc.subjectThermal radiation-
dc.titleField investigation of a photonic multi-layered TiO2 passive radiative cooler in sub-tropical climate-
dc.typeArticle-
dc.identifier.emailChao, CYH: cyhchao@hku.hk-
dc.identifier.authorityChao, CYH=rp02396-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.renene.2019.06.119-
dc.identifier.scopuseid_2-s2.0-85068056227-
dc.identifier.hkuros298613-
dc.identifier.volume146-
dc.identifier.spage44-
dc.identifier.epage55-
dc.publisher.placeUnited Kingdom-

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