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Oscillating gadolinium thermal switch.

Number: 0024

Author(s) : PETELIN N., PEČAR B., VRTAČNIK D., PERNE J., TOMC U., KITANOVSKI A.

Summary

Thermal control devices such as thermal switches, thermal diodes and thermal regulators are two-terminal devices used to passively or actively control the intensity and direction of heat flow, which has proven useful in various thermal management applications, including caloric technologies. Here, a millimetre-scale oscillating gadolinium thermal switch is constructed using commercially available materials, with steady-state switching ratio of rswitch = 2,3. The thermal switch uses electrostatic forces for actuation and makes thermal contact between the heat source and the heat sink when in the ON state, and breaks contact when in the OFF state. In the ON state when the thermal switch is oscillating the Gd plate transfers heat, while in the OFF state, the Gd plate does not oscillate and heat is transferred via parasitic conduction through air gap and device’s housing. The thermal conductance is 2,42·10-1 W/K in the ON state and 1,22·10-1 W/K in the OFF state. The thermal switch exhibits consistent and repeatable actuation over more than > 105 oscillation cycles and can be used to actively route heat flows in thermal management applications. Our proof-of-concept device has a convenient geometry and can be easily implemented in various thermal management system where implementation and/or operation of conventional thermal management methods are not suitable. 

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Pages: 7

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Details

  • Original title: Oscillating gadolinium thermal switch.
  • Record ID : 30032632
  • Languages: English
  • Subject: Technology
  • Source: 10th IIR Conference on Caloric Cooling and Applications of Caloric Materials
  • Publication date: 2024/08/24
  • DOI: http://dx.doi.org/10.18462/iir.thermag.2024.0024

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