Emissivity and reflectivity measurements for passive radiative cooling technologies

Adibekyan, Albert; Schumacher, Jamy; Pattelli, Lorenzo; Manara, Jochen; Meriç, S.; Bazkir, Ö.; Cucchi, C.; Sprengard, C.; Pérez, G.; Campos, J.; Hameury, J.; Andersson, A.; Clausen, S.; Rasmussen, A.; Belotti, C.; Efthymiou, S.; Assimakopoulos, M.-N.; Papadaki, D.; Manoocheri, F.; Flores, A. L.; Jaramillo-Fernandez, J.; Gionfini, T.; Ortisi, M.; Peter, A.; Kleinbub, M.; Bante, Jana; Donath, Laura; Herzog, Heiko; Monte, Christian

doi:https://doi.org/10.1007/s10765-025-03532-6

Zugriffsnummer	53091
Dokumenttyp	Zeitschriftenartikel
Peer Review	mit Peer Review
Sprache	Englisch
Titel	Emissivity and reflectivity measurements for passive radiative cooling technologies
Autor(in); Institution	Adibekyan, Albert; 7.3, Detektorradiometrie und Strahlungsthermometrie, PTB-Berlin Schumacher, Jamy; 7.3, Detektorradiometrie und Strahlungsthermometrie, PTB-Berlin Pattelli, Lorenzo; Italian National Institute of Metrology, Torino, ITALY Manara, Jochen; Center for Applied Energy Research, Würzburg, GERMANY Meriç, S.; Scientific and Technological Research Institution of Türkiye, Ankara, TÜRKIYE Bazkir, Ö.; Scientific and Technological Research Institution of Türkiye, Ankara, TÜRKIYE Cucchi, C.; Forschungsinstitut für Wärmeschutz e.V., München, GERMANY Sprengard, C.; Forschungsinstitut für Wärmeschutz e.V., München, GERMANY Pérez, G.; Instituto de Ciencias de la Construccion Eduardo Torroja (IETCC), CSIC, Madrid, SPAIN Campos, J.; Instituto de Optica Daza de Valdes (IO), CSIC, Madrid, SPAIN Hameury, J.; Laboratoire national de métrologie et d'essais, Paris, FRANCE Andersson, A.; RISE Research Institutes of Sweden AB, Göteborg, SWEDEN Clausen, S.; Dansk Fundamental Metrologi A/S, Hørsholm, DENMARK Rasmussen, A.; Dansk Fundamental Metrologi A/S, Hørsholm, DENMARK Belotti, C.; Consiglio Nazionale delle Ricerche, Sesto Fiorentino, ITALY Efthymiou, S.; National and Kapodistrian University of Athens, Athens, GREECE Assimakopoulos, M.-N.; National and Kapodistrian University of Athens, Athens, GREECE Papadaki, D.; National and Kapodistrian University of Athens, Athens, GREECE Manoocheri, F.; Aalto-korkeakoulusäätiö sr, Espoo, FINLAND Flores, A. L.; Cooling Photonics Sociedad Limitada, SPAIN Jaramillo-Fernandez, J.; Cooling Photonics Sociedad Limitada, SPAIN; Universitat Politecnica de Catalunya, SPAIN Gionfini, T.; Almeco Group., ITALY Ortisi, M.; Almeco Group., ITALY Peter, A.; Deutsche Gesellschaft für Internationale Zusammenarbeit (GIZ) GmbH, Eschborn, GERMANY Kleinbub, M.; Deutsche Gesellschaft für Internationale Zusammenarbeit (GIZ) GmbH, Kigali RWANDA Bante, Jana; 9.35, Subsahara-Afrika, PTB-Braunschweig Donath, Laura; 9.31, Europa, Südkaukasus, Zentralasien, PTB-Braunschweig Herzog, Heiko; Kompetenz in Lack Farbe, Kirschweiler, GERMANY Monte, Christian; 7.3, Detektorradiometrie und Strahlungsthermometrie, PTB-Berlin
Quelle/Jahr	International Journal of Thermophysics: 46 (2025), 1 - 16
Artikelnummer	66
Availability	[online first]
ISSN	0195-928X (print) ; 1572-9567 (online)
DOI	https://doi.org/10.1007/s10765-025-03532-6
Persistent Identifier	https://link.springer.com/article/10.1007/s10765-025-03532-6
Verlag	Berlin [u.a.]: Springer
Zusammenfassung	Due to their optical properties, passive radiative cooling (PRC) materials can effectively reflect solar radiation while simultaneously dissipating heat through the infrared transparency windows by using space as a cold and renewable heat sink. This makes it possible to achieve sub-ambient temperatures even in direct sunlight without using any electricity for cooling or air-conditioning. However, the accurate determination of these peculiar optical properties is challenging and subject to high uncertainty levels when using commercial instruments available to industrial end users and research laboratories. Within the EU project PaRaMetriC, aiming at establishing a metrological framework for the comparable performance evaluation of PRC technologies, the Physikalisch-Technische Bundesanstalt (PTB) is leading a work package dedicated to the development of accurate and traceable methods to determine the infrared optical and thermophysical properties of PRC materials. These include reflectivity and emissivity in the broad spectral range from 250 nm to 50 µm, encompassing both the solar spectrum (250 nm – 2500 nm) and the infrared transparency window of the atmosphere (7.1 μm – 13 μm) with a target absolute uncertainty of less than 0.03. For this purpose, several candidate benchmark passive cooling materials have been characterized by PTB in the wavelength range between 1.4 µm and 50 µm. Characterizations of, and comparisons between, reference and end-user measurement techniques applied for the measurements of selected PRC materials will not only allow accurate determination of the thermophysical properties, but also identification of measurement problems and suitable approaches in this rapidly expanding field.

Kostenfreier Zugang	Open Access Hybrid
Rechteinformation	CC BY 4.0 ; Creative Commons Attribution 4.0 License

Themenbereich der Metrologie

Photometrie und Radiometrie

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Adibekyan, A., Schumacher, J., Pattelli, L., Manara, J., Meriç, S., Bazkir, Ö., Cucchi, C., Sprengard, C., Pérez, G., Campos, J., Hameury, J., Andersson, A., Clausen, S., Rasmussen, A., Belotti, C., Efthymiou, S., Assimakopoulos, M.-N., Papadaki, D., Manoocheri, F., Flores, A. L., Jaramillo-Fernandez, J., Gionfini, T., Ortisi, M., Peter, A., Kleinbub, M., Bante, J., Donath, L., Herzog, H., & Monte, C. (2025). Emissivity and reflectivity measurements for passive radiative cooling technologies. International Journal of Thermophysics, 46, 1–16. https://doi.org/10.1007/s10765-025-03532-6

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