Towards powerful magnetocaloric devices with static electro-permanent magnets

Tomc, Urban; Nosan, Simon; Klinar, Katja; Kitanovski, Andrej

doi:10.1016/j.jare.2022.05.001

Cited by 10 publications

(4 citation statements)

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“…A magnetization and demagnetization time of 5 ms was used in the simulations. This value was experimentally demonstrated by Tomc et al [51] in the development of a static and hybrid electro-permanent magnet. The numerical model is not limited to Gd as a MCM, but can be used for any MCM if the entropy values and thermal properties are known.…”

Section: Numerical Simulationsmentioning

confidence: 56%

“…The single-stage concept with the TSC is proposed to be located within the air gap between the two windings in a magnetocaloric device, as schematically shown in figure 2(A). Our concept design involves using a static electro-permanent magnet, for which it has been experimentally proven that frequencies up to 50 Hz can be achieved [51]. The working principle includes four main steps as shown in figure 2…”

Section: A Conceptual Design Of a Thermal Switch Capacitor In A Magne...mentioning

confidence: 99%

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A conceptual design of a thermal switch capacitor in a magnetocaloric device: experimental characterization of properties and simulations of operating characteristics

2023

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The quest for better performance from magnetocaloric devices has led to the development of thermal control devices, such as thermal switches, thermal diodes, and thermal capacitors. These devices are capable of controlling the intensity and direction of the heat flowing between the magnetocaloric material and the heat source or heat sink, and therefore have the potential to simultaneously improve the power density and energy efficiency of magnetocaloric systems. We have developed a new type of thermal control device, i.e., a silicon mechanical thermal switch capacitor. In this paper we first review recently developed thermal switches based on MEMS and present the operation and structure of our new thermal switch capacitor. Then, the results of the parametric experimental study on the thermal contact resistance, as one of the most important parameters affecting the thermal performance of the device, are presented. These experimental data were later used in a numerical model for a magnetocaloric device with a thermal switch-capacitor. The results of the study show that for a single embodiment, a maximum cooling power density of 970 W/m2 (510 W/kgmcm) could be achieved for a zero-temperature span and an operating frequency of 5 Hz. However, a larger temperature span could be achieved by cascading multiple magnetocaloric elements with thermal switch capacitors. We have shown that the compact thermal switch capacitor can be used in caloric devices, even with small temperature variations, and can be used in a variety of practical applications requiring thermal regulation.

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Section: Numerical Simulationsmentioning

confidence: 56%

Section: A Conceptual Design Of a Thermal Switch Capacitor In A Magne...mentioning

confidence: 99%

A conceptual design of a thermal switch capacitor in a magnetocaloric device: experimental characterization of properties and simulations of operating characteristics

2023

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“…In all simulations, the magnetization and demagnetization time was set to 5 ms. This value was numerically and experimentally demonstrated by Tomc et al., 15 who developed a static and hybrid electro-permanent magnet with the magnetic energy recovery, which enabled efficient operation at frequencies of about 50 Hz. A longer time would result in a reduced cooling performance, because these two processes should occur under adiabatic conditions.…”

Section: Resultsmentioning

confidence: 77%

“… 13 The concept allows the use of static magnetic field sources, like those presented by Klinar et al. 14 and Tomc et al., 15 and represent an energy-efficient route to high-frequency operation. Several mechanisms for the mechanical actuation of solid TSs in caloric technologies have been reported, including electrical actuation, 16 , 17 magnetic actuation 18 and mechanical actuation.…”

Section: Introductionmentioning

confidence: 99%

The numerical study on performance evaluation of a thermal switch capacitor in a magnetocaloric cooling device

Petelin¹,

Vozel²,

Klinar³

et al. 2022

iScience

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Perspectives and Energy Applications of Magnetocaloric, Pyromagnetic, Electrocaloric, and Pyroelectric Materials

Klinar,

Law,

Franco

et al. 2024

Advanced Energy Materials

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This perspective provides an overview of the state of research and innovation in the areas of magnetocaloric and pyromagnetic materials, and electrocaloric and pyroelectric materials, including the overlapping sub‐areas of multicaloric and multipyro materials that can operate simultaneously under the application of magnetic and electric fields. These materials are critically examined for their potential to revolutionize cooling, heating, and energy‐harvesting applications. This perspective first summarizes the state‐of‐the‐art advancements and highlights recent significant developments. Then, it is identified and discussed that the prevailing challenges hindering the widespread adoption of technologies based on these materials. In this context, after consulting with members of the caloric and pyro communities, a technology roadmap is outlined to guide research efforts in overcoming current barriers to applications, with the goal of achieving impactful results by 2040. This roadmap emphasizes the importance of focusing on under‐researched materials, novel devices, and application spaces, paving the way for interdisciplinary efforts that can lead to significant reductions in carbon dioxide emissions.

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Towards powerful magnetocaloric devices with static electro-permanent magnets

Cited by 10 publications

References 50 publications

A conceptual design of a thermal switch capacitor in a magnetocaloric device: experimental characterization of properties and simulations of operating characteristics

A conceptual design of a thermal switch capacitor in a magnetocaloric device: experimental characterization of properties and simulations of operating characteristics

The numerical study on performance evaluation of a thermal switch capacitor in a magnetocaloric cooling device

Perspectives and Energy Applications of Magnetocaloric, Pyromagnetic, Electrocaloric, and Pyroelectric Materials

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