High-performance thermomagnetic generator controlled by a magnetocaloric switch

Xianliang Liu, Haodong Chen, Jianyi Huang, Kaiming Qiao, Ziyuan Yu, Longlong Xie, Raju V. Ramanujan, Fengxia Hu, Ke Chu, Yi Long and Hu Zhang ()
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Xianliang Liu: University of Science and Technology Beijing
Haodong Chen: University of Science and Technology Beijing
Jianyi Huang: University of Science and Technology Beijing
Kaiming Qiao: University of Science and Technology Beijing
Ziyuan Yu: University of Science and Technology Beijing
Longlong Xie: University of Science and Technology Beijing
Raju V. Ramanujan: Nanyang Technological University
Fengxia Hu: Chinese Academy of Sciences
Ke Chu: Lanzhou Jiaotong University
Yi Long: University of Science and Technology Beijing
Hu Zhang: University of Science and Technology Beijing

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract Low grade waste heat accounts for ~65% of total waste heat, but conventional waste heat recovery technology exhibits low conversion efficiency for low grade waste heat recovery. Hence, we designed a thermomagnetic generator for such applications. Unlike its usual role as the coil core or big magnetic yoke in previous works, here the magnetocaloric material acts as a switch that controls the magnetic circuit. This makes it not only have the advantage of flux reversal of the pretzel-like topology, but also present a simpler design, lower magnetic stray field, and higher performance by using less magnetocaloric material than preceding devices. The effects of key structural and system parameters were studied through a combination of experiments and finite element simulations. The optimized max power density PDmax produced by our device is significantly higher than those of other existing active thermomagnetic, thermo, and pyroelectric generators. Such high performance shows the effectiveness of our topology design of magnetic circuit with magnetocaloric switch.

Date: 2023
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DOI: 10.1038/s41467-023-40634-x

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