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

Petelin, Nada (avtor), Kalin, Mitjan (avtor), Kitanovski, Andrej (avtor)

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 (TSC). In this paper we first review recently developed thermal switches based on micro-electromechanical systems and present the operation and structure of our new TSC. 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 m$^{−2}$ (510 W kg$_{mcm}{}^{−1}$) 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 TSCs. We have shown that the compact TSC can be used in caloric devices, even with small temperature variations, and can be used in a variety of practical applications requiring thermal regulation.

• Jezik: Angleški jezik
• Ključne besede: thermal switches, magnetocalorics, cooling, thermal conductivity, thermal diffusivity, solid thermal switch capacitors, thermal control devices, heat pumps
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FS - Fakulteta za strojništvo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2023
• Št. strani: 15 str.
• Številčenje: Vol. 5, no. 3, art. 035007
• PID: 20.500.12556/RUL-147715
• UDK: 621.56
• ISSN pri članku: 2515-7655
• DOI: 10.1088/2515-7655/ace288
• COBISS.SI-ID: 157226499
• Datum objave v RUL: 12.07.2023

Gradivo je del revije

• Naslov: JPhys energy
• Skrajšan naslov: JPhys energy
• Založnik: IOP Publishing
• ISSN: 2515-7655
• COBISS.SI-ID: 529763609

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: toplotna stikala, magnetokalorika, hlajenje, toplotna prevodnost, toplotna difuzivnost