Liu Xianliang, Chen Haodong, Huang Jianyi, Qiao Kaiming, Yu Ziyuan, Xie Longlong, Ramanujan Raju V, Hu Fengxia, Chu Ke, Long Yi, Zhang Hu
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, P R China.
School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798, Singapore.
Nat Commun. 2023 Aug 9;14(1):4811. doi: 10.1038/s41467-023-40634-x.
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 P 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.
低品位废热约占总废热的65%，但传统的废热回收技术在低品位废热回收方面转换效率较低。因此，我们设计了一种用于此类应用的热磁发电机。与以往工作中磁热材料通常作为线圈铁芯或大磁轭的作用不同，在这里磁热材料充当控制磁路的开关。这使其不仅具有类似椒盐卷饼拓扑结构的磁通反转优势，而且通过使用比先前装置更少的磁热材料，呈现出更简单的设计、更低的杂散磁场和更高的性能。通过实验和有限元模拟相结合的方式研究了关键结构和系统参数的影响。我们的装置产生的优化最大功率密度P显著高于其他现有的有源热磁、热电和热释电发电机。如此高性能表明了我们采用磁热开关的磁路拓扑设计的有效性。
