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Multifunctional Cantilevers as Working Elements in Solid-State Cooling Devices

Bradesko, Andraz ; Fulanovic, Lovro ; Vrabelj, Marko ; Matavz, Aleksander ; Otonicar, Mojca ; Koruza, Jurij ; Malič, Barbara ; Rojac, Tadej (2021)
Multifunctional Cantilevers as Working Elements in Solid-State Cooling Devices.
In: Actuators, 10 (3)
doi: 10.3390/act10030058
Artikel, Bibliographie

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Kurzbeschreibung (Abstract)

Despite the challenges of practical implementation, electrocaloric (EC) cooling remains a promising technology because of its good scalability and high efficiency. Here, we investigate the feasibility of an EC cooling device that couples the EC and electromechanical (EM) responses of a highly functionally, efficient, lead magnesium niobate ceramic material. We fabricated multifunctional cantilevers from this material and characterized their electrical, EM and EC properties. Two active cantilevers were stacked in a cascade structure, forming a proof-of-concept device, which was then analyzed in detail. The cooling effect was lower than the EC effect of the material itself, mainly due to the poor solid-to-solid heat transfer. However, we show that the use of ethylene glycol in the thermal contact area can significantly reduce the contact resistance, thereby improving the heat transfer. Although this solution is most likely impractical from the design point of view, the results clearly show that in this and similar cooling devices, a non-destructive, surface-modification method, with the same effectiveness as that of ethylene glycol, will have to be developed to reduce the thermal contact resistance. We hope this study will motivate the further development of multifunctional cooling devices.

Typ des Eintrags: Artikel
Erschienen: 2021
Autor(en): Bradesko, Andraz ; Fulanovic, Lovro ; Vrabelj, Marko ; Matavz, Aleksander ; Otonicar, Mojca ; Koruza, Jurij ; Malič, Barbara ; Rojac, Tadej
Art des Eintrags: Bibliographie
Titel: Multifunctional Cantilevers as Working Elements in Solid-State Cooling Devices
Sprache: Englisch
Publikationsjahr: 19 März 2021
Verlag: MDPI
Titel der Zeitschrift, Zeitung oder Schriftenreihe: Actuators
Jahrgang/Volume einer Zeitschrift: 10
(Heft-)Nummer: 3
DOI: 10.3390/act10030058
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Kurzbeschreibung (Abstract):

Despite the challenges of practical implementation, electrocaloric (EC) cooling remains a promising technology because of its good scalability and high efficiency. Here, we investigate the feasibility of an EC cooling device that couples the EC and electromechanical (EM) responses of a highly functionally, efficient, lead magnesium niobate ceramic material. We fabricated multifunctional cantilevers from this material and characterized their electrical, EM and EC properties. Two active cantilevers were stacked in a cascade structure, forming a proof-of-concept device, which was then analyzed in detail. The cooling effect was lower than the EC effect of the material itself, mainly due to the poor solid-to-solid heat transfer. However, we show that the use of ethylene glycol in the thermal contact area can significantly reduce the contact resistance, thereby improving the heat transfer. Although this solution is most likely impractical from the design point of view, the results clearly show that in this and similar cooling devices, a non-destructive, surface-modification method, with the same effectiveness as that of ethylene glycol, will have to be developed to reduce the thermal contact resistance. We hope this study will motivate the further development of multifunctional cooling devices.

Freie Schlagworte: electrocaloric response, electromechanical response, multifunctional materials, cooling
Fachbereich(e)/-gebiet(e): 11 Fachbereich Material- und Geowissenschaften
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Nichtmetallisch-Anorganische Werkstoffe
Hinterlegungsdatum: 22 Mär 2021 07:38
Letzte Änderung: 03 Jul 2024 02:51
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