关键词: 室温磁制冷, 磁回热器, 磁工质, 制冷温跨, 制冷功率

Abstract: Based on the application requirements for household refrigeration, a room-temperature magnetic refrigerator was developed. It consists of a 1.62 T double-barrel concentric rotating magnetic field and a magnetic regenerator made from Gd/Gd-Er mixed working material. Experimental research revealed that under free-cooling conditions, the system achieved a maximum temperature span of 40.42 °C and an optimal heat exchange flow rate of 3 L/min. Additionally, simulations of household refrigeration operation were conducted to investigate the impact of heat dissipation conditions on system performance across varying ambient temperatures. Results indicate that both the cooling temperature span and cooling power of the system significantly decrease as ambient temperature rises. Optimal performance was observed at 20 °C ambient temperature, where the maximum cooling capacity (at zero temperature span) and maximum temperature span (at zero cooling power) reached 140 W~150 W and 27.40 °C, respectively. Conversely, the poorest performance occurred at 35 °C ambient temperature, with corresponding values of 40 W and 7.21 °C for maximum cooling capacity and temperature span under the same zero-power/zero-span conditions. The study further analyzed practical applications and identified directions for system improvements, providing critical references for commercializing room-temperature magnetic refrigeration technology.

Key words: Room-temperature magnetic refrigeration, Magnetic regenerator, Magnetic working material, Cooling temperature span, Cooling power