Magnetocaloric Energy Conversion by Andrej Kitanovski Jaka Tušek Urban Tomc Uroš Plaznik Marko Ožbolt & Alojz Poredoš

Author:Andrej Kitanovski, Jaka Tušek, Urban Tomc, Uroš Plaznik, Marko Ožbolt & Alojz Poredoš
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

As can be seen in Fig. 6.6, different temperature profiles, which also correspond to different mass flows of the working fluid, do not drastically influence the average exergy efficiency of all the thermal diode mechanisms embodied in the magnetocaloric device (100 thermal diodes were estimated in this particular case). The average values of the exergy efficiency of the thermal diodes are high (above 85 %), which again points to the high efficiency of such a mechanism, despite the fact that the exergy efficiency of the Peltier module is very low.

The value 85 % of exergy efficiency denotes that 15 % of exergy will be destroyed due to application of the Peltier thermal diodes on the cold side of the magnetocaloric material (positioned below the magnetocaloric material in Fig. 6.5). Since thermal diodes are placed also on the warm side of the magnetocaloric material (positioned above the magnetocaloric material in Fig. 6.5), one can expect that Peltier thermal diode mechanism in the magnetocaloric device will reduce its exergy efficiency for about 15–30 % (depending on the characteristics of Peltier modules and their efficiency, which in our case was taken to be rather low). Despite reduction in the exergy efficiency due to the application of thermal diodes, the same mechanism avoids exergy losses in other parts of device: valves, seals, dead volume, bidirectional pumping, etc.

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