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MA: Fachverband Magnetismus
MA 61: Caloric Effects
MA 61.10: Vortrag
Freitag, 20. März 2020, 11:45–12:00, HSZ 101
Optimizing a thermomagnetic generator with flux reversal by finite element calculations — •Dietmar Berger1, Daniel Dzekan1, Deepak Kamble1,2, Kornelius Nielsch1, and Sebastian Fähler1 — 1IFW Dresden, Helmholtzstraße 20, D-01069 Dresden, Germany — 2School of Materials, Science and Engineering, Nanyang Technological University, Singapore 639798
Climate protection and the efficient use of primary energy are increasingly gaining the focus of public interest. Against this background, the generation of electrical energy from environmentally friendly and regenerative energy sources is increasingly important. In particular the huge amount of low temperature waste heat below 100 °C is almost not reusable.
The discovery of the giant magnetocaloric effect by Pecharsky and Gschneidner in 1997 [1] led to the development of new materials exhibiting a sharp change in magnetization in vicinity of room temperature. These materials also enabled the inverse energy conversion process: thermomagnetic harvesting of low temperature waste heat.
In this presentation we use our recent thermomagnetic generator with flux reversal as starting point [2]. The focus of our current work is to increase both, the conversion efficiency and the cycle frequency. By using FEM simulations we analyze the drawbacks of the present demonstrator and sketch improvements for the next generation of thermomagnetic generators.
[1] V. K. Pecharsky and K. A. Gschneidner, Jr., Phys. Rev. Lett. 78, 4494 (1997) [2] A. Waske et al., Nature Energy 4, 68-74 (2019)