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The influence of the time variation of the magnetic field, termed themagnetic field profile, on the performance of a magnetocaloric refrigerationdevice using the active magnetic regeneration (AMR) cycle is studied for anumber of process parameters for both a parallel plate and packed bedregenerator using a numerical model. The cooling curve of the AMR is shown tobe almost linear far from the Curie temperature of the magnetocaloric material.It is shown that a magnetic field profile that is 10% of the cycle time out ofsync with the flow profile leads to a drop in both the maximum temperature spanand the maximum cooling capacity of 20-40\% for both parallel plate and packedbed regenerators. The maximum cooling capacity is shown to depend very weaklyon the ramp rate of the magnetic field. Reducing the temporal width of the highfield portion of the magnetic field profile by 10% leads to a drop in maximumtemperature span and maximum cooling capacity of 5-20%. An increase of themagnetic field from 1 T to 1.5 T increases the maximum cooling capacity by30-50% but the maximum temperature span by only 20-30%. Finally, it was seenthat the influence of changing the magnetic field was more or less the same forthe different regenerator geometries and operating parameters studied here.This means that the design of the magnet can be done independently of theregenerator geometry.

The influence of the magnetic field on the performance of an active magnetic regenerator (AMR)