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A multifaceted polymer coating as thermal emitter for sub-ambient passive radiative cooling of buildings and photovoltaics

Banik, Udayan und Meddeb Dite Hasanet, Hosni und Sergeev, Oleg und Reininghaus, Nies und Gehrke, Kai und Vehse, Martin (2023) A multifaceted polymer coating as thermal emitter for sub-ambient passive radiative cooling of buildings and photovoltaics. In: New Concepts in Solar and Thermal Radiation Conversion V. SPIE. SPIE Optical Engineering + Applications, 2023-08-20 - 2023-08-25, San Diego, California, United States. doi: 10.1117/12.2675794.

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Offizielle URL: https://www.spiedigitallibrary.org/conference-proceedings-of-spie/PC12668/PC1266806/A-multifaceted-polymer-coating-as-thermal-emitter-for-sub-ambient/10.1117/12.2675794.full

Kurzfassung

Passive radiative cooling technology offers viable solution for the thermal management of both buildings and photovoltaics (PV) sectors in terrestrial and extraterrestrial applications. Herein, we demonstrate and analyze the effectiveness of a simple solution-processed thin organopolysilazane polymer coating as thermal emitter for sub-ambient passive daytime radiative cooling (PDRC) of surface structures and solar cell devices. The 5µm thick Siliconoxycarbonitride (SiCNO) polymer emitter features spectral selective emissivity in Mid-Infrared spectrum due to the perfect overlap of the vibrational modes of Si-O-Si, Si-N-Si, Si-C bonds with the atmospheric transmittance window. Applying the SiCNO emitter on a metallic reflector substrate yields high reflection in the solar wavelength range (0.3-2.5µm), and high narrowband emissivity in the atmospheric transmittance window (8-13 μm). The thin PDRC device can cool down to 6.8°C below ambient corresponding to a net cooling power of 93.7 W/m2. The deep sub-ambient cooling performance of PDRC was experimentally demonstrated using a cryogenic indoor setup under vacuum conditions reaching a max ∆T of 33°C (at 10-3 Pa) below ambient. Using analytical modeling we studied the impact of individual parasitic heat losses on the PDRC under variable air pressure. We suggest a rational design of sub-components and operational pressure regimes for a vacuum-based cooler system in real-world applications. Moreover, the SiCNO coating is a suitable candidate as an encapsulating coating for solar modules due to the exceptionally high transmissivity in the solar spectrum range and high emissivity in the infrared region. Our thermal and electrical analysis demonstrated that the polymer emitter can solitarily cool down lightweight flexible solar modules in a lower earth orbit by 30°C without inducing efficiency losses from the device. The robustness of this hydrophobic protective polymer coating was proven through various accelerated degradation tests. The results from these investigations indicate that polysilazane polymer coating is an excellent thermal emitter material for both terrestrial and space applications.

elib-URL des Eintrags:https://elib.dlr.de/198997/
Dokumentart:Konferenzbeitrag (Vorlesung)
Titel:A multifaceted polymer coating as thermal emitter for sub-ambient passive radiative cooling of buildings and photovoltaics
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Banik, UdayanUdayan.Banik (at) dlr.dehttps://orcid.org/0000-0003-2605-2215147182401
Meddeb Dite Hasanet, HosniHosni.Meddeb (at) dlr.dehttps://orcid.org/0000-0001-8939-7910NICHT SPEZIFIZIERT
Sergeev, Olegoleg.sergeev (at) dlr.dehttps://orcid.org/0000-0002-5022-6118NICHT SPEZIFIZIERT
Reininghaus, NiesNies.Reininghaus (at) dlr.dehttps://orcid.org/0000-0002-9509-274XNICHT SPEZIFIZIERT
Gehrke, KaiKai.Gehrke (at) dlr.dehttps://orcid.org/0000-0002-0591-8289NICHT SPEZIFIZIERT
Vehse, Martinmartin.vehse (at) dlr.dehttps://orcid.org/0000-0003-0578-6121NICHT SPEZIFIZIERT
Datum:26 September 2023
Erschienen in:New Concepts in Solar and Thermal Radiation Conversion V
Referierte Publikation:Nein
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
DOI:10.1117/12.2675794
Verlag:SPIE
Status:veröffentlicht
Stichwörter:subambient radiative cooler, organopolysilazane, polymer-derived coating, thin photonic emitter, silicon oxycarbonitride emitter, PDRC, solar cell
Veranstaltungstitel:SPIE Optical Engineering + Applications
Veranstaltungsort:San Diego, California, United States
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:20 August 2023
Veranstaltungsende:25 August 2023
Veranstalter :SPIE
HGF - Forschungsbereich:Energie
HGF - Programm:Energiesystemdesign
HGF - Programmthema:Digitalisierung und Systemtechnologie
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E SY - Energiesystemtechnologie und -analyse
DLR - Teilgebiet (Projekt, Vorhaben):E - Energiesystemtechnologie
Standort: Oldenburg
Institute & Einrichtungen:Institut für Vernetzte Energiesysteme > Stadt- und Gebäudetechnologien
Hinterlegt von: Banik, Udayan
Hinterlegt am:22 Nov 2023 15:23
Letzte Änderung:28 Mai 2024 09:13

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