Concept of a magnetocaloric generator with latent heat transfer for the conversion of heat into electricity

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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

Standort
Deutsche Nationalbibliothek Frankfurt am Main
Umfang
Online-Ressource
Sprache
Englisch
Anmerkungen
Energy technology. - 10, 3 (2022) , 2100891, ISSN: 2194-4296

Ereignis
Veröffentlichung
(wo)
Freiburg
(wer)
Universität
(wann)
2022
Urheber

DOI
10.1002/ente.202100891
URN
urn:nbn:de:bsz:25-freidok-2257227
Rechteinformation
Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
Letzte Aktualisierung
15.08.2025, 07:24 MESZ

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