期刊
APPLIED THERMAL ENGINEERING
卷 226, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2023.120272
关键词
Hybrid refrigerator; GM refrigeration; Magnetic refrigeration; Magnetic regenerator; Cooling performance
A hybrid refrigerator that combines the GM refrigeration effect with the magnetic refrigeration effect has been built, and a new magnetic regenerator filled with Pb, ErNi and EuTi0.875Al0.125O3 has been constructed to improve the cooling performance. The new magnetic regenerator filled with EuTi0.875Al0.125O3 could obtain a lower cooling temperature and a larger cooling power in the hybrid refrigerator, as predicted numerically and confirmed by experimental tests.
A hybrid refrigerator that combines the GM refrigeration effect with the magnetic refrigeration effect has been built before. Based on the hybrid refrigerator, a new magnetic regenerator filled with Pb, ErNi and EuTi0.875Al0.125O3 has been constructed to improve the cooling performance of the hybrid refrigerator. Among the three regenerative materials, EuTi0.875Al0.125O3 is a newly developed ferromagnetic material with high volumetric specific heat and large magnetocaloric effect below 5 K, which is better than the TmCuAl used in the previous regenerator. The numerical prediction shows that the new magnetic regenerator filled with EuTi0.875Al0.125O3 could obtain a lower cooling temperature and a larger cooling power in the hybrid refriger-ator. Then, the cooling performance of the new magnetic regenerator has been systematically studied by experimental tests. In the experiments, the minimum no-load temperature of the new magnetic regenerator could reach 2.48 K, which was much lower than the minimum no-load temperature of 3.5 K in the previous regen-erator. Meanwhile, the cooling power of 0.652 W at 4.2 K was produced in the new magnetic regenerator, which was larger than the previous regenerator by 0.361 W, and the corresponding relative Carnot efficiency was 0.48 % at 4.2 K in the new magnetic regenerator.
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