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Homogeneous Polymer Films for Passive Daytime Cooling : Optimized Thickness for Maximized Cooling Performance

DOI zum Zitieren der Version auf EPub Bayreuth: https://doi.org/10.15495/EPub_UBT_00006423
URN to cite this document: urn:nbn:de:bvb:703-epub-6423-2

Title data

Herrmann, Kai ; Lauster, Tobias ; Song, Qimeng ; Retsch, Markus:
Homogeneous Polymer Films for Passive Daytime Cooling : Optimized Thickness for Maximized Cooling Performance.
In: Advanced Energy & Sustainability Research. Vol. 3 (2022) Issue 2 . - No. 2100166.
ISSN 2699-9412
DOI der Verlagsversion: https://doi.org/10.1002/aesr.202100166

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Project information

Project title:
Project's official titleProject's id
VISIRday714968
Open Access PublizierenNo information

Project financing: ERC

Abstract

Passive radiative cooling materials that spontaneously cool below ambient temperature could save tremendous amounts of energy used for cooling applications. A multitude of materials, structures, and fabrication strategies have been reported in recent years. Important material parameters like a tailored or broadband emissivity, angle selectivity, or the influence of non-radiative heat losses were discussed in detail. The material thickness has been far less researched and is typically chosen sufficiently thick to ensure high emission in the atmospheric transparency window between wavelengths of 8 – 13 µm. However, not only the material emittance but also atmospheric and solar energy uptake depend on the material thickness. This broadband interplay has been less addressed so far. Here we show, how an optimum thickness of a passive cooling material can be predicted when the optical properties of the material are known. Using complex refractive index data, we calculate the thickness dependent cooling performance of Polydimethylsiloxane (PDMS) in back-reflector geometry as exemplary material. For both day- and night-time operation, we report an optimum emitter thickness. We verify our findings experimentally by measuring the equilibrium temperatures of PDMS films with different thicknesses in a rooftop experiment. Our presented analytical approach is directly transferable to other materials.

Further data

Item Type: Article in a journal
Keywords: radiative cooling; radiative heat transfer; thermal emission; complex refractive index; thermal management
DDC Subjects: 500 Science > 540 Chemistry
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Physical Chemistry I
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Physical Chemistry I > Chair Physical Chemistry I - Univ.-Prof. Dr. Markus Retsch
Profile Fields > Advanced Fields > Polymer and Colloid Science
Profile Fields > Advanced Fields > Advanced Materials
Profile Fields > Emerging Fields > Energy Research and Energy Technology
Research Institutions > Research Centres > Bayreuth Institute of Macromolecular Research - BIMF
Research Institutions > Research Centres > Bayreuth Center for Colloids and Interfaces - BZKG
Research Institutions > Research Centres > Bayerisches Zentrum für Batterietechnik - BayBatt
Research Institutions > Affiliated Institutes > Bavarian Polymer Institute (BPI)
Research Institutions > EU Research Projects > VISIRday
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Profile Fields
Profile Fields > Advanced Fields
Profile Fields > Emerging Fields
Research Institutions
Research Institutions > Research Centres
Research Institutions > Affiliated Institutes
Research Institutions > EU Research Projects
Language: English
Originates at UBT: Yes
URN: urn:nbn:de:bvb:703-epub-6423-2
Date Deposited: 23 Jun 2022 06:28
Last Modified: 05 Aug 2022 09:11
URI: https://epub.uni-bayreuth.de/id/eprint/6423

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