平板磁制冷和热电磁复合制冷微元循环数值研究

In this paper, a two-dimensional transient flat-plate magnetic refrigeration micro-element model and a hybrid refrigeration micro-element model combining thermoelectric refrigeration with magnetic refrigeration are constructed by means of COMSOL Multiphysics 5.5. The effects of thermocouple thickness, input current, operating frequency, and external convection heat transfer coefficient on the performance of the hybrid refrigeration were investigated. The simulation results show that, under most operating conditions, the specific cooling power of the hybrid refrigeration model is greater than that of the magnetic refrigeration model. Changing different geometric and operating parameters has different effects on the performance of hybrid refrigeration. Within the research conditions, by changing the thickness of the thermocouple (0.05∼0.5 mm), input current (0.4∼0.8 A), operating frequency (0.5∼4 Hz), and convective heat transfer coefficient (500∼2000 W·m⁻²·K⁻¹), compared with the flat-plate magnetic refrigeration, the hybrid refrigeration has the maximum increase in cooling power density is 2.05 times, 2.12 times, 2.68 times, and 1.87 times, respectively. This study has an important reference value for the follow-up research on the mechanism of the hybrid refrigeration system combining thermoelectric refrigeration with magnetic refrigeration.