论文部分内容阅读
为了探究不同工质形貌对磁制冷系统的影响,优化磁蓄冷器结构设计,利用数值模拟对比研究3种不同结构的磁蓄冷器(圆孔型、矩形孔型和平板型)的制冷功率和制冷系数(COP)。3种模型中,孔隙率为0.3的平板型磁蓄冷器综合制冷效果突出。对平板型磁蓄冷器进一步研究表明,频率为0.5 Hz时,板厚为0.3 mm的蓄冷器制冷效果最好,在利用率为3.0时,其零温跨制冷功率为200 W,COP为3.3左右;在较高频率下(>0.5 Hz),工质板越薄,蓄冷器制冷效果越好;而在低频下(<0.5 Hz),工质板的厚度对蓄冷器制冷效果影响很小;制冷功率随温跨的增大而减小,温跨为4和16 K时分别对应21和5 W的制冷功率(热端温度为304 K时);温跨随热端温度的增大而增大。
In order to explore the effect of different working substance topography on magnetic refrigeration system, the structural design of magnetic regenerator was optimized. The cooling power of three kinds of magnetic regenerators (round hole type, rectangular hole type and flat type) were compared by numerical simulation Coefficient of refrigeration (COP). Three kinds of models, the porosity of 0.3 flat-type magnetic cold storage integrated cooling effect prominent. The further research on flat magnetic regenerator shows that the cooling effect of regenerator with thickness of 0.3 mm is the best at 0.5 Hz, and its zero-temperature cross-cooling power is 200 W and its COP is about 3.3 at the utilization rate of 3.0 ; At higher frequencies (> 0.5 Hz), the thinner the working plate is, the better the cooling effect of the regenerator is; at low frequencies (<0.5 Hz), the thickness of the working plate has little effect on the cooling effect of the regenerator; The power decreases with the increase of the temperature span. When the temperature span is 4 and 16 K, it corresponds to the cooling power of 21 and 5 W (the temperature of the hot end is 304 K). The temperature span increases with the increase of the hot end temperature .