Design Issues and Future Perspectives for Magnetocaloric Energy Conversion - Magnetocaloric Energy Conversion: From Theory to Applications - page 351

Fig. 8.25 Application of the AMR principle combined with a thermal diode mechanism,
classi cation no: R2011(5)3(7)11012

inactive, thus preventing the heat to ow from magnetized magnetocaloric material

to the lower micro-heat exchanger. We show in Fig. 8.25 an additional heat source
CHEX and a heat-sink heat exchanger HHEX, respectively. However, this might
not be necessary, since the fluid flow in micro-heat exchangers (the “ upper ” micro-
heat exchanger represents the heat sink and the

fl

“ lower ” micro-heat exchanger

represents the heat source) apply the uni-directional uid. Since

the frequency of the operation of such a system is fast, the heat is actually con-
tinuously transferred (pulsated) from the heat source to the demagnetized mag-
netocaloric material and from the magnetized magnetocaloric material to the heat
sink. Additionally, a counter working

fl ow of the working fl

fl uid- fl ow direction in combination with the

operation of the rotating magnetic eld source and synchronized thermal diode