Journal ArticleDOI
Numerical investigations on internal temperature distribution and refrigeration performance of reciprocating active magnetic regenerator of room temperature magnetic refrigeration
Min Liu,Bingfeng Yu +1 more
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TLDR
In this paper, a two-dimensional porous medium model for a reciprocating active magnetic regenerator (AMR) of room temperature magnetic refrigeration has been developed, and the thermal diffusion effect, heat flux boundary effect and variable fluid physical properties are considered in the model.Abstract:
A two-dimension porous medium model for a reciprocating active magnetic regenerator (AMR) of room temperature magnetic refrigeration has been developed. The thermal diffusion effect, heat flux boundary effect and variable fluid physical properties are considered in the model. In the paper, we compare the numerical results of the porous medium model with the experimental data and the calculation results of one-dimension Schumann model to validate our model. Our model can simulate the operation of the reciprocating AMR effectively. With the present model, the internal heat exchange between the two phases is numerically investigated. The two dimensional temperature distributions of the magnetic refrigerant and the refrigeration performance of AMR are obtained, and the influence of the heat flux boundary effect and the variable fluid properties on them is discussed. AMR can achieve a maximum refrigeration capacity of 293.7 W with a corresponding coefficient of performance (COP) of 5.4.read more
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Journal ArticleDOI
Review on numerical modeling of active magnetic regenerators for room temperature applications
Kaspar Kirstein Nielsen,Jaka Tušek,Kurt Engelbrecht,Sandro Schopfer,Andrej Kitanovski,Christian R.H. Bahl,Anders Smith,Nini Pryds,Alojz Poredoš +8 more
TL;DR: In this paper, the authors reviewed the existing numerical modeling of room temperature active magnetic regenerator (AMR) to date and concluded that more detailed modeling of these phenomena is required to obtain a better understanding of the AMR cycle.
Journal ArticleDOI
Enhanced relative cooling power of Ni1−xZnxFe2O4 (0.0 ⩽ x ⩽ 0.7) ferrites
TL;DR: In this paper, the structural, magnetic and magnetocaloric properties of Zn-doped nickel-zinc ferrites with different Zn concentrations were investigated using X-ray diffraction results.
Journal ArticleDOI
Geometrical optimization of packed-bed and parallel-plate active magnetic regenerators
TL;DR: In this article, numerical optimization of a packed-bed and a parallel-plate AMR with gadolinium as the magnetocaloric material is presented, and the results reveal that for the considered conditions the optimum length of the packed bed AMR should be 20 mm or less at higher operating frequency (3 Hz) and 40 mm at lower operating frequency(0.5 Hz).
Journal ArticleDOI
Dynamic operation of an active magnetic regenerator (AMR): Numerical optimization of a packed-bed AMR
TL;DR: In this paper, a fast and flexible, time-dependent, one-dimensional numerical model was developed in order to study in detail the operation of an active magnetic regenerator (AMR).
Journal ArticleDOI
Experimental and numerical comparison of multi-layered La(Fe,Si,Mn)13Hy active magnetic regenerators
Kristina Navickaitė,Henrique Neves Bez,Tian Lei,Alexander Barcza,Hugo Vieyra,Christian R.H. Bahl,Kurt Engelbrecht +6 more
TL;DR: In this paper, an experimental and numerical comparison of epoxy bonded multi-layered La(Fe,Si,Mn)13Hy active magnetic regenerators is presented, and the experimental results of two regenerators with five and nine layers are compared to predictions from the one-dimensional numerical model.
References
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Journal ArticleDOI
Magnetocaloric effect and magnetic refrigeration
TL;DR: In this article, the magnetocaloric effect along with recent progress and future needs in both the characterization and exploration of new magnetic refrigerant materials with respect to their magnetoric properties are discussed.
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Thirty years of near room temperature magnetic cooling: Where we are today and future prospects
TL;DR: The seminal study by Brown in 1976 showed that it was possible to use the magnetocaloric effect to produce a substantial cooling effect near room temperature as discussed by the authors, and since then, over 25 magnetic cooling units have been built and tested throughout the world.
Journal ArticleDOI
Analysis of dispersion effects and non-thermal equilibrium, non-Darcian, variable porosity incompressible flow through porous media
A. Amiri,Kambiz Vafai +1 more
TL;DR: In this paper, a numerical simulation of forced convective incompressible flow through porous media, and the associated transport processes was employed, and a full general model for the momentum equation was employed.
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Review on research of room temperature magnetic refrigeration
TL;DR: In this article, the concept of magnetocaloric effect is explained and the development of the magnetic material, magnetic refrigeration cycles, magnetic field and the regenerator of room temperature magnetic refrigerators is introduced.
Journal ArticleDOI
A review of magnetic refrigerator and heat pump prototypes built before the year 2010
TL;DR: In this paper, the main part of the review is dedicated to magnetic refrigeration at room temperature, while the other part is devoted to magnetic heating and cooling technologies, and a complete list and description of existing magnetic cooling and cooling prototypes up to the year 2010 is given.