Towards powerful magnetocaloric devices with static electro-permanent magnets
Introduction: Magnetocaloric energy conversion represents an alternative to existing refrigeration, heat pump and energy harvesting technologies. A crucial part of a magnetocaloric device concerns the magnetic field source. It uses mainly rare-earth materials and consists of moving parts and a drive...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-03-01
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| Series: | Journal of Advanced Research |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2090123222001138 |
| _version_ | 1797894388028801024 |
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| author | Urban Tomc Simon Nosan Katja Klinar Andrej Kitanovski |
| author_facet | Urban Tomc Simon Nosan Katja Klinar Andrej Kitanovski |
| author_sort | Urban Tomc |
| collection | DOAJ |
| description | Introduction: Magnetocaloric energy conversion represents an alternative to existing refrigeration, heat pump and energy harvesting technologies. A crucial part of a magnetocaloric device concerns the magnetic field source. It uses mainly rare-earth materials and consists of moving parts and a drive system while displaying a limited energy efficiency and unavailability of fast and variable control of the magnetic field. Recent advances in efficient heat transfer for high-frequency magnetic cooling call for new developments of magnetic field sources that can operate with high efficiency at high frequencies. Objectives: We report the concept of an electro-permanent magnetic (EPM) field source that efficiently recovers magnetic energy. In contrast to existing magnets, it allows very well-controlled operation without any moving parts. The main objective of this paper is to present a numerical and experimental study in which such an EPM was designed, built and tested. Methods: An extensive numerical investigation of the proposed design was carried out in terms of various geometrical and operating parameters. One of the design variations was built and experimentally evaluated for its energy efficiency and temperature increase at various operating frequencies. Results: We demonstrate an energy efficiency of these magnets of over 80% and operation with frequencies up to 50 Hz, which is crucial for future high-power-density and high-frequency magnetocaloric devices. Conclusions: Considering high energy efficiency at high operating frequencies, such EPMs would allow for miniaturization, making them a viable option for future compact magnetocaloric devices. |
| first_indexed | 2024-04-10T07:08:14Z |
| format | Article |
| id | doaj.art-4759024eb94e454db6e0736c37650410 |
| institution | Directory Open Access Journal |
| issn | 2090-1232 |
| language | English |
| last_indexed | 2024-04-10T07:08:14Z |
| publishDate | 2023-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Advanced Research |
| spelling | doaj.art-4759024eb94e454db6e0736c376504102023-02-27T04:07:03ZengElsevierJournal of Advanced Research2090-12322023-03-0145157181Towards powerful magnetocaloric devices with static electro-permanent magnetsUrban Tomc0Simon Nosan1Katja Klinar2Andrej Kitanovski3Faculty of Mechanical Engineering, University of Ljubljana, Askerceva 6, 1000 Ljubljana, SloveniaFaculty of Mechanical Engineering, University of Ljubljana, Askerceva 6, 1000 Ljubljana, SloveniaFaculty of Mechanical Engineering, University of Ljubljana, Askerceva 6, 1000 Ljubljana, SloveniaCorresponding author.; Faculty of Mechanical Engineering, University of Ljubljana, Askerceva 6, 1000 Ljubljana, SloveniaIntroduction: Magnetocaloric energy conversion represents an alternative to existing refrigeration, heat pump and energy harvesting technologies. A crucial part of a magnetocaloric device concerns the magnetic field source. It uses mainly rare-earth materials and consists of moving parts and a drive system while displaying a limited energy efficiency and unavailability of fast and variable control of the magnetic field. Recent advances in efficient heat transfer for high-frequency magnetic cooling call for new developments of magnetic field sources that can operate with high efficiency at high frequencies. Objectives: We report the concept of an electro-permanent magnetic (EPM) field source that efficiently recovers magnetic energy. In contrast to existing magnets, it allows very well-controlled operation without any moving parts. The main objective of this paper is to present a numerical and experimental study in which such an EPM was designed, built and tested. Methods: An extensive numerical investigation of the proposed design was carried out in terms of various geometrical and operating parameters. One of the design variations was built and experimentally evaluated for its energy efficiency and temperature increase at various operating frequencies. Results: We demonstrate an energy efficiency of these magnets of over 80% and operation with frequencies up to 50 Hz, which is crucial for future high-power-density and high-frequency magnetocaloric devices. Conclusions: Considering high energy efficiency at high operating frequencies, such EPMs would allow for miniaturization, making them a viable option for future compact magnetocaloric devices.http://www.sciencedirect.com/science/article/pii/S2090123222001138Magnetic field sourceMagnetocaloricRefrigerationEnergy conversionHeat transferEnergy recovery |
| spellingShingle | Urban Tomc Simon Nosan Katja Klinar Andrej Kitanovski Towards powerful magnetocaloric devices with static electro-permanent magnets Journal of Advanced Research Magnetic field source Magnetocaloric Refrigeration Energy conversion Heat transfer Energy recovery |
| title | Towards powerful magnetocaloric devices with static electro-permanent magnets |
| title_full | Towards powerful magnetocaloric devices with static electro-permanent magnets |
| title_fullStr | Towards powerful magnetocaloric devices with static electro-permanent magnets |
| title_full_unstemmed | Towards powerful magnetocaloric devices with static electro-permanent magnets |
| title_short | Towards powerful magnetocaloric devices with static electro-permanent magnets |
| title_sort | towards powerful magnetocaloric devices with static electro permanent magnets |
| topic | Magnetic field source Magnetocaloric Refrigeration Energy conversion Heat transfer Energy recovery |
| url | http://www.sciencedirect.com/science/article/pii/S2090123222001138 |
| work_keys_str_mv | AT urbantomc towardspowerfulmagnetocaloricdeviceswithstaticelectropermanentmagnets AT simonnosan towardspowerfulmagnetocaloricdeviceswithstaticelectropermanentmagnets AT katjaklinar towardspowerfulmagnetocaloricdeviceswithstaticelectropermanentmagnets AT andrejkitanovski towardspowerfulmagnetocaloricdeviceswithstaticelectropermanentmagnets |