热磁对流
磁制冷
拓扑(电路)
材料科学
余热
余热回收装置
发电机(电路理论)
电磁线圈
制冷剂
磁场
汽车工程
功率(物理)
热交换器
机械工程
电气工程
凝聚态物理
热力学
工程类
物理
磁化
量子力学
作者
Xian‐Liang Liu,Haodong Chen,Jianyi H. Huang,Kaiming Qiao,Ziyuan Yu,Longlong Xie,R.V. Ramanujan,Fengxia Hu,Ke Chu,Yi Long,Hu Zhang
标识
DOI:10.1038/s41467-023-40634-x
摘要
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.
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