Evaluation of thermomagnetic generation performance of classic magnetocaloric materials for harvesting low-grade waste heat

Haodong Chen, Zhihui Ma, Xianliang Liu, Kaiming Qiao, Longlong Xie, Zhenxing Li, Jun Shen, Wei Dai, Zhiqiang Ou, Hargen Yibole, Ojiyed Tegus, Sergey V. Taskaev, Ke Chu, Yi Long and Hu Zhang

Applied Energy, 2022, vol. 306, issue PA, No S0306261921013015

Abstract: Nowadays, the thermomagnetic generators (TMGs) based on thermomagnetic effect have been considered as a promising technology for harvesting low-grade waste heat. However, so far, most works are mainly focused on the design and optimization of these devices, while only a few studies have systematically investigated the TMG materials; moreover, evaluating the performance of different TMG materials is quite difficult. This paper reports the fabrication of an active thermomagnetic device for harvesting low-grade waste heat and, for the first time, a systematical performance evaluation of classic magnetocaloric materials (Gd, Gd5(Si, Ge)4, NiMn-based Heusler alloy, and La(Fe, Si)13Hy/In composite). Alternating current (I) was obtained via thermally induced, reversible magnetic transition during the heating and cooling cycles, achieving the harvest of low-grade waste heat; besides, the results showed that the induced I depended not only on dM/dT but also on dT/dt. The intrinsic TMG performance of all the target materials were compared comprehensively by eliminating the influence of different TC locations. Among them, the La(Fe, Si)13Hy/In composite exhibited the highest induced current I (9.12 μA g−1) and power density (0.47 mW m−3); in particular, its investment cost index was 1–2 orders of magnitude higher than those of the other materials. Thus, this work demonstrates that the La(Fe, Si)13Hy/In composite is a promising TMG material for harvesting low-grade waste heat.

Keywords: Low-grade waste heat; Thermomagnetic generator; Magnetocaloric effect; Energy harvesting (search for similar items in EconPapers)
Date: 2022
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Citations: View citations in EconPapers (3)

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DOI: 10.1016/j.apenergy.2021.117999

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