Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 10: Caloric Effects in Ferromagnetic Materials

MA 10.9: Vortrag

Montag, 20. März 2017, 17:30–17:45, HSZ 04

Examination of Gd/Gd-Y alloys stacks with different Curie temperatures in a magnetocaloric test bench — •Jonas Wortmann, Dimitri Benke, Tino Gottschall, Marc Pabst, Andreas Taubel, Konstantin Skokov, Iliya Radulov, and Oliver Gutfleisch — TU Darmstadt, Funktionale Materialien, Deutschland

Refrigeration using the magnetocaloric effect has the potential to overtake classical gas compression techniques in regards to efficiency and environmental friendliness [1]. To come closer to the goal of building a working refrigerator a linear magnetocaloric test bench with an average magnetic field change of 1T was built.

This article investigated the options of maximizing the temperature span and lowest achievable temperature by stacking Gd and Gd-Y alloys with different Curie temperatures. The temperatures between the stacks were investigated to estimate the necessary mass of specific of stacks and identify possible efficiency drops inside of the magnetocaloric material. Furthermore, the effect of the frequency, pumped water volume, angle between magnetic field and water flow as well as the utilization of a heat sink were examined.

To evaluate the applicability of the magnetocaloric effect the cooling power and the COP were determined as well as the behavior of the magnetocaloric material when exposed to a heat source were studied.