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 ℃). The results show that

when the operating frequency is 0.22 Hz

the maximum refrigeration temperature span of the system is 12.8 ℃. Further

when the Gd temperature is lower than the Curie temperature of 20 ℃

the room temperature has no effect on the cooling capacity of the magnetic refrigeration system over a finite time period.