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在旋转永磁体复合室温磁制冷机基础上,对系统进行了改进,并且进行了实验研究。改进之处在于:1)将回热器填料由不规则的钆屑改为厚度为1 mm宽度为5 mm的钆条,钆条之间缝隙为0.5 mm的规则回热器填料;2)将驱动电机外置;3)在冷端换热器与膨胀腔之间加装热缓冲管.改进之后的实验系统分析了交变流动工质的系统工作频率对磁制冷机性能的影响,对比了改进前后系统的实验结果,实验结果表明,改进之后的复合式室温磁制冷机在相同实验条件下明显优于改进前,在优化系统频率条件下,可以获得-16.5℃的最低无负荷制冷温度,以及12.5 K温差下58 W的最大制冷量.
Based on rotating permanent magnet compound room temperature magnetic refrigerator, the system is improved, and experimental research is carried out. The improvements are: 1) the regenerator packing is changed from irregular gadolinium chips to a regular regenerator packing with a 1 mm width of 5 mm gadolinium bars and 0.5 mm gap between gadolinium bars; 2) Drive the motor outside; 3) install a thermal buffer tube between the cold-side heat exchanger and the expansion chamber.An improved experimental system analyzes the influence of the system operating frequency of the alternating-current working fluid on the performance of the magnetic refrigerator, The experimental results show that the modified room-temperature magnetic refrigerator is significantly better than the previous one under the same experimental conditions. Under the optimized system frequency, the lowest non-load refrigeration temperature of -16.5 ℃ can be obtained, And a maximum cooling capacity of 58 W at a 12.5 K temperature difference.