A thermal regulator using passive all-magnetic actuation

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dc.citation.articleNumber101556
dc.citation.issueNumber9
dc.citation.journalTitleCell Reports Physical Science
dc.citation.volumeNumber4
dc.contributor.authorCastelli, Lorenzo
dc.contributor.authorGarg, Ajay
dc.contributor.authorZhu, Qing
dc.contributor.authorSashital, Pooja
dc.contributor.authorShimokusu, Trevor J.
dc.contributor.authorWehmeyer, Geoff
dc.date.accessioned2024-05-08T18:56:09Z
dc.date.available2024-05-08T18:56:09Z
dc.date.issued2023
dc.description.abstractThermal regulators are two-terminal devices used for passive temperature control of electronics, batteries, or buildings. Existing thermal expansion regulators suffer from large thicknesses and substantial hysteresis. Here we report an all-magnetic thermal regulator in which the temperature of the control terminal (Tcontrol) leads to passive steady-state surface mating/demating that enables/blocks heat conduction. The mechanism relies on Tcontrol-dependent magnetic forces between gadolinium and neodymium iron boron magnets when Tcontrol is near gadolinium’s Curie temperature of 21oC. Our centimeter-scale prototype has a thermal switch ratio of 34−13+30 in vacuum and 2.1−0.2+0.2 in air, a vacuum OFF state thermal conductance of 3.5 mW/K, an average switching temperature of 20oC, a small thermal deadband of 5oC, and a relatively compact thickness <2 cm. We quantify the regulator performance over >2,000 cycles and construct the regulator using commercially available materials, showing that this thermomagnetic device can be used for effective thermal regulation near room temperature.
dc.identifier.citationCastelli, L., Garg, A., Zhu, Q., Sashital, P., Shimokusu, T. J., & Wehmeyer, G. (2023). A thermal regulator using passive all-magnetic actuation. Cell Reports Physical Science, 4(9), 101556. https://doi.org/10.1016/j.xcrp.2023.101556
dc.identifier.digital1-s20-S2666386423003533-main
dc.identifier.doihttps://doi.org/10.1016/j.xcrp.2023.101556
dc.identifier.urihttps://hdl.handle.net/1911/115660
dc.language.isoeng
dc.publisherElsevier
dc.rightsExcept where otherwise noted, this work is licensed under a Creative Commons Attribution (CC BY) license. Permission to reuse, publish, or reproduce the work beyond the terms of the license or beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.titleA thermal regulator using passive all-magnetic actuation
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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