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  4. Energy harvesting near room temperature using a thermomagnetic generator with a pretzel-like magnetic flux topology
 
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Energy harvesting near room temperature using a thermomagnetic generator with a pretzel-like magnetic flux topology

Publikationstyp
Journal Article
Publikationsdatum
2019-01-01
Sprache
English
Author
Waske, Anja 
Dzekan, Daniel 
Sellschopp, Kai orcid-logo
Berger, Dietmar 
Stork, Alexander 
Nielsch, Kornelius 
Fähler, Sebastian 
Institut
Keramische Hochleistungswerkstoffe M-9 
TORE-URI
http://hdl.handle.net/11420/2126
Enthalten in
Nature energy 
Volume
4
Issue
1
Start Page
68
End Page
74
Citation
Nature Energy 1 (4): 68-74 (2019-01-01)
Publisher DOI
10.1038/s41560-018-0306-x
Scopus ID
2-s2.0-85059442422
© 2018, The Author(s), under exclusive licence to Springer Nature Limited. To date, there are very few technologies available for the conversion of low-temperature waste heat into electricity. Thermomagnetic generators are one approach proposed more than a century ago. Such devices are based on a cyclic change of magnetization with temperature. This switches a magnetic flux and, according to Faraday’s law, induces a voltage. Here we demonstrate that guiding the magnetic flux with an appropriate topology of the magnetic circuit improves the performance of thermomagnetic generators by orders of magnitude. Through a combination of experiments and simulations, we show that a pretzel-like topology results in a sign reversal of the magnetic flux. This avoids the drawbacks of previous designs, namely, magnetic stray fields, hysteresis and complex geometries of the thermomagnetic material. Our demonstrator, which is based on magnetocaloric plates, illustrates that this solid-state energy conversion technology presents a key step towards becoming competitive with thermoelectrics for energy harvesting near room temperature.
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