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Influence de la fréquence de fonctionnement et de la température ambiante sur le refroidissement magnétique alternatif.

[In Chinese. / En chinois.]

Auteurs : WANG Q., LIU B., CHEN A., et al.

Type d'article : Article

Résumé

To analyze the influence of different working frequencies and room temperatures on the cooling span of a reciprocating room temperature magnetic refrigeration system, a setup for such a system was designed with granular Gd (particle size: 0.3-0.5 mm) as the magnetic working mass. The cooling temperature of the reciprocating room-temperature magnetic refrigeration system was then analyzed , combined with the heat transfer characteristics in the active cooler during the experiment. A 1. 5 T permanent magnet field strength was maintained , and the changes in the cold-and hot-end temperatures of the cold accumulator were measured at different operating frequencies (0.07 , 0.12 , 0.16 , 0.19 , 0.22 Hz) and room temperatures (14.5 , 15.9 , 16.7 , 18. 1 °C). The results show that,when the operating frequency is 0.22 Hz , the maximum refrigeration temperature span of the system is 12.8 °C. Further , when the Gd temperature is lower than the Curie temperature of 20 °C, the room temperature has no effect on the cooling capacity of the magnetic refrigeration system over a finite time period.

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Pages : 76-81

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