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      Uncovering the non-radiative thermal characteristics of a passive radiative cooler under real operating conditions

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      Author(s)
      Koçer, Hasan
      Durna, Yılmaz
      Işık, Halil
      Soydan, Mahmut Can
      Khalichi, Bahram
      Ghobadi, Amir
      Kurt, H.
      Özbay, Ekmel
      Date
      2022-12-12
      Source Title
      Journal of Physics D: Applied Physics
      Print ISSN
      0022-3727
      Electronic ISSN
      1361-6463
      Publisher
      Institute of Physics Publishing Ltd.
      Volume
      56
      Issue
      3
      Pages
      1 - 8
      Language
      English
      Type
      Article
      Item Usage Stats
      9
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      6
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      Abstract
      Passive radiative cooling (PasRadCool), which emits thermal energy from objects to deep cold space through atmospheric transparency, offers complementary and alternative green energy solutions for passive cooling of buildings, clothing, and renewable energy harvesting. Depending on the spectral emissive/absorptive properties of the unit under test (UUT), radiative heat exchanges occur between the UUT, atmosphere, and sun, while at the same time non-radiative heat exchange occurs. The performance of the PasRadCool is determined by the combined thermal and thermodynamic effects of both exchange mechanisms. Although the non-radiative heat exchange, which consists of conductive and convective processes to the outer surfaces of the UUT and the surrounding air fluid, is very sensitive to environmental changes, the actual performance is not fully determined since this feature is considered statically in many studies. Herein, we propose a method that reveals the non-radiative thermal characteristics of the PasRadCool under real operating conditions. With a photonic radiative cooler structure, which we manufacture as a proof of concept, we perform nighttime field test measurements in varying non-radiative thermal conditions. The proposed method extracts the time-dependent non-radiative heat transfer coefficient of the UUT as accurately as possible. We also confirm that our experimental result shows good agreement with both numerical and analytical methods. The proposed approach, which highlights the realistic thermal management of PasRadCool, is not specific to the circumstances of our study and can be applied to all PasRadCool situations with different geometry, material, and environmental conditions.
      Keywords
      Passive radiative cooling
      Thermal analysis
      Radiative and non-radiative heat transfer
      Permalink
      http://hdl.handle.net/11693/112014
      Published Version (Please cite this version)
      https://doi.org/10.1088/1361-6463/ac9fde
      Collections
      • Department of Electrical and Electronics Engineering 4011
      • Department of Physics 2550
      • Institute of Materials Science and Nanotechnology (UNAM) 2258
      • Nanotechnology Research Center (NANOTAM) 1179
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