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Dresden 2020 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 61: Caloric Effects

MA 61.11: Vortrag

Freitag, 20. März 2020, 12:00–12:15, HSZ 101

Evaluation of magnetocaloric materials for thermomagnetic energy harvesting — •Daniel Dzekan1,2, Anja Waske3, Kornelius Nielsch1,2, and Sebastian Fähler21Technical University Dresden, Institute for Material Science — 2Leibniz IFW Dresden, Institute for Metallic Materials — 3Bundesanstalt für Materialforschung und -prüfung (BAM), Berlin, Germany

Nowadays recovering waste heat becomes decisive to use the limited primary energy most effective. A promising way to do so is the usage of thermomagnetic systems. Within these, heat is first converted into magnetic energy and then into electricity. Early device concepts had been suggested by Edison and Tesla but only few of them were realized. This changed due to the emerging field of magnetocaloric cooling and the development of new materials. These exhibit a steep change of magnetisation in a narrow temperature range, which paved the way for several thermomagnetic demonstrators and prototypes. Recently we presented a thermomagnetic generator with a novel design of the magnetic circuit, which increased the power output, frequency and efficiency significantly [1]. Here we identify and analyse the material requirements for a more energy and economic efficient conversion. We describe the influence of magnetisation change and heat capacity on thermodynamic efficiency, as well as the consequences of thermal conductivity on power density. [1] Waske et al., Nature Energy 4, 68-74 (2019)

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