Concept of a magnetocaloric generator with latent heat transfer for the conversion of heat into electricity
Abstract: Second-order and first-order magnetocaloric materials (MCMs) not experiencing hysteresis are characterized by a reversible temperature change when exposed to an applied magnetic field. Due to this property described by the magnetocaloric effect, MCMs are used in magnetic cooling applications. Conversely, a rapid variation of the MCM's temperature around its specific Curie temperature causes a fast change in its magnetic permeability. Cycling the MCM's temperature within a magnetic field allows the possibility of inducing voltage, which would be higher for rapid cycling rates. Herein, latent heat transfer is introduced as an approach to obtain higher heating/cooling cycle frequency in a magnetocaloric generator that converts heat to electricity. In practice, rapid condensation/evaporation cycles of the water on a first-order magnetocaloric La(Fe,Si) alloy are observed in a high vacuum system. This leads to the fast change of magnetization in an applied magnetic field from which an induced voltage is picked up. With the constructed set-up, a peak induced voltage 2.75 mVp is obtained from low-grade heat having reservoir temperature differences of △T = 56 °C. At higher temperature differences, a peak-to-peak voltage of around 3.5 mVpp at a cycle frequency of 2 Hz is achieved
- Location
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Deutsche Nationalbibliothek Frankfurt am Main
- Extent
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Online-Ressource
- Language
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Englisch
- Notes
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Energy technology. - 10, 3 (2022) , 2100891, ISSN: 2194-4296
- Event
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Veröffentlichung
- (where)
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Freiburg
- (who)
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Universität
- (when)
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2022
- Creator
- DOI
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10.1002/ente.202100891
- URN
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urn:nbn:de:bsz:25-freidok-2257227
- Rights
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Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
- Last update
-
15.08.2025, 7:24 AM CEST
Data provider
Deutsche Nationalbibliothek. If you have any questions about the object, please contact the data provider.
Associated
- Baliozian, Puzant
- Corhan, Patrick
- Hess, Tobias
- Bartholomé, Kilian
- Wöllenstein, Jürgen
- Universität
Time of origin
- 2022
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