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Multifunctional Cantilevers as Working Elements in Solid-State Cooling Devices

Bradeško, Andraž ; Fulanović, Lovro ; Vrabelj, Marko ; Matavž, Aleksander ; Otoničar, Mojca ; Koruza, Jurij ; Malič, Barbara ; Rojac, Tadej (2022):
Multifunctional Cantilevers as Working Elements in Solid-State Cooling Devices. (Publisher's Version)
In: Actuators, 10 (3), MDPI, e-ISSN 2076-0825,
DOI: 10.26083/tuprints-00019604,
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Item Type: Article
Origin: Secondary publication DeepGreen
Status: Publisher's Version
Title: Multifunctional Cantilevers as Working Elements in Solid-State Cooling Devices
Language: English
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.

Journal or Publication Title: Actuators
Volume of the journal: 10
Issue Number: 3
Publisher: MDPI
Collation: 13 Seiten
Uncontrolled Keywords: electrocaloric response, electromechanical response, multifunctional materials, cooling
Classification DDC: 500 Naturwissenschaften und Mathematik > 500 Naturwissenschaften
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
Date Deposited: 02 Feb 2022 13:12
Last Modified: 02 May 2022 12:07
DOI: 10.26083/tuprints-00019604
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-196045
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/19604
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