Regenerator for a magnetic heat exchanger and heat exchanger

A regenerator for a magnetic heat exchanger, comprising:

• a housing having a chamber, an inlet for a working medium and an outlet for the working medium, the chamber having a volume V,
• at least one magnetocalorically active component that is arranged in the chamber between the inlet and the outlet and that has at least one inner flow channel with a hydraulic diameter dhyd,
• wherein the volume of the chamber that is not occupied by the magnetocalorically active component provides at least one bypass flow channel, wherein both the inlet and the outlet are reached from the at least one bypass flow channel, and this bypass flow channel has a hydraulic diameter D, where D>dhyd and wherein the at least one inner flow channel of the magnetocalorically active component is in flow communication with the bypass flow channel,
• wherein a flow direction of the working medium extends from the inlet to the outlet, and the magnetocalorically active component and the at least one bypass flow channel are arranged in parallel with one another with respect to the direction of flow.