scholarly journals Scaling and universality in magnetocaloric materials

2014 ◽  
Vol 90 (10) ◽  
Author(s):  
Anders Smith ◽  
Kaspar K. Nielsen ◽  
Christian R. H. Bahl
Keyword(s):  
Scaling And Universality ◽  
Magnetocaloric Materials

scholarly journals Finite Element Analysis of Magnetic Field Exciter for Direct Testing of Magnetocaloric Materials’ Properties

Energies ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2792
Author(s):  
Wieslaw Lyskawinski ◽  
Wojciech Szelag ◽  
Cezary Jedryczka ◽  
Tomasz Tolinski
Keyword(s):  
Magnetic Field ◽  
Finite Element ◽  
Magnetic Circuit ◽  
Homogeneous Magnetic Field ◽  
Element Analysis ◽  
Mcm Testing ◽  
Testing Region ◽  
Magnetocaloric Materials ◽  
Field Excitation ◽  
The Magnetic Field

The paper presents research on magnetic field exciters dedicated to testing magnetocaloric materials (MCMs) as well as used in the design process of magnetic refrigeration systems. An important element of the proposed test stand is the system of magnetic field excitation. It should provide a homogeneous magnetic field with a controllable value of its intensity in the MCM testing region. Several concepts of a magnetic circuit when designing the field exciters have been proposed and evaluated. In the MCM testing region of the proposed exciters, the magnetic field is controlled by changing the structure of the magnetic circuit. A precise 3D field model of electromagnetic phenomena has been developed in the professional finite element method (FEM) package and used to design and analyze the exciters. The obtained results of the calculations of the magnetic field distribution in the working area were compared with the results of the measurements carried out on the exciter prototype. The conclusions resulting from the conducted research are presented and discussed.

scholarly journals Influence of thermal conductivity on the dynamic response of magnetocaloric materials

2015 ◽  
Vol 59 ◽  
pp. 29-36 ◽  
Author(s):  
G. Porcari ◽  
K. Morrison ◽  
F. Cugini ◽  
J.A. Turcaud ◽  
F. Guillou ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Dynamic Response ◽  
Magnetocaloric Materials

scholarly journals Coupling Phenomena in Magnetocaloric Materials

2018 ◽  
Vol 6 (8) ◽  
pp. 1429-1447 ◽  
Author(s):  
Anja Waske ◽  
Biswanath Dutta ◽  
Niclas Teichert ◽  
Bruno Weise ◽  
Navid Shayanfar ◽  
...  
Keyword(s):  
Magnetocaloric Materials ◽  
Coupling Phenomena

scholarly journals Reversibility of the Magnetocaloric Effect in the Bean-Rodbell Model

2021 ◽  
Vol 7 (5) ◽  
pp. 60
Author(s):  
Luis M. Moreno-Ramírez ◽  
Victorino Franco
Keyword(s):  
Magnetic Field ◽  
Thermal Hysteresis ◽  
Entropy Change ◽  
Second Order ◽  
Zero Field ◽  
First Order ◽  
Magnetic Field Change ◽  
Magnetocaloric Materials ◽  
Moderate Magnetic Field ◽  
The Magnetic Field

The applicability of magnetocaloric materials is limited by irreversibility. In this work, we evaluate the reversible magnetocaloric response associated with magnetoelastic transitions in the framework of the Bean-Rodbell model. This model allows the description of both second- and first-order magnetoelastic transitions by the modification of the η parameter (η<1 for second-order and η>1 for first-order ones). The response is quantified via the Temperature-averaged Entropy Change (TEC), which has been shown to be an easy and effective figure of merit for magnetocaloric materials. A strong magnetic field dependence of TEC is found for first-order transitions, having a significant increase when the magnetic field is large enough to overcome the thermal hysteresis of the material observed at zero field. This field value, as well as the magnetic field evolution of the transition temperature, strongly depend on the atomic magnetic moment of the material. For a moderate magnetic field change of 2 T, first-order transitions with η≈1.3−1.8 have better TEC than those corresponding to stronger first-order transitions and even second-order ones.

The calorimetric method of evaluating the performance of magnetocaloric materials

2018 ◽  
Vol 136 (2) ◽  
pp. 937-941 ◽  
Author(s):  
Victor V. Korolev ◽  
Dmitriy V. Korolev ◽  
Anna G. Ramazanova
Keyword(s):  
Calorimetric Method ◽  
Magnetocaloric Materials
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