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A thermal regulator using passive all-magnetic actuation

Thermal 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 c...

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Published in:Cell reports physical science 2023-09, Vol.4 (9), p.101556, Article 101556
Main Authors: Castelli, Lorenzo, Garg, Ajay, Zhu, Qing, Sashital, Pooja, Shimokusu, Trevor J., Wehmeyer, Geoff
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cited_by cdi_FETCH-LOGICAL-c344t-e2dc1b536a05dd6359d97b0e5721fec3592d9aa8a517d0c889185549bc5530743
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container_issue 9
container_start_page 101556
container_title Cell reports physical science
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creator Castelli, Lorenzo
Garg, Ajay
Zhu, Qing
Sashital, Pooja
Shimokusu, Trevor J.
Wehmeyer, Geoff
description Thermal 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 2,000 cycles and construct the regulator using commercially available materials, showing that this thermomagnetic device can be used for effective thermal regulation near room temperature. [Display omitted] •Passive two-terminal thermal switching using thermomagnetic actuation•Mechanism utilizes reversible magnetic phase transition of gadolinium foil•Switch ratio >30 in vacuum with switch temperatures ∼20°C and thickness 30x thermal switch ratios, offering potential for applications in aerospace or building thermal management.
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subjects contact conductance
thermal management
thermal regulation
thermal switch
thermomagnetic devices
title A thermal regulator using passive all-magnetic actuation
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