Design of nested Halbach cylinder arrays for magnetic refrigeration applications

Trevizoli, Paulo V.; Lozano, Jaime; Peixer, Guilherme Fidelis; Barbosa, Jader R.

doi:10.1016/j.jmmm.2015.07.023

Cited by 57 publications

(18 citation statements)

References 26 publications

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“…The numerical methods are developed by Pantankar [121]. Moreover, the AMR numerical methods described in the work of Engelbrecht [76] and Trevizoli [108] are used to construct the numerical governing equations.…”

Section: Appendix B Discretization Methodsmentioning

confidence: 99%

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A concise approach for building the $s-T$ diagram for Mn–Fe–P–Si hysteretic magnetocaloric material

Christiaanse¹,

Campbell²,

Trevizoli³

et al. 2017

J. Phys. D: Appl. Phys.

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The objective of this work is to assess the potential of Mn-Fe-SiP for magnetic heat pump applications. Mn-Fe-SiP is a first order transition magnetocaloric material made from safe and abundantly available constituents. A significant magnetocaloric effect occurs at the transition temperature of the material. The transition temperature can be tuned by changing the atom ratios to a region near room temperature. Mn-Fe-SiP in magnetic heat pumps is investigated by determining the material's properties, 1D system modeling and experiments in a magnetic heat pump prototype. We characterize six samples of Mn-Fe-SiP , based on their heat capacity and magnetization. The reversible component of the adiabatic temperature change is found from the entropy diagram and compared to cyclic adiabatic temperature change measurements. Five of the six samples are selected to be formed into epoxy fixed crushed particulate beds, which can be installed into a magnetic heat pump prototype.

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Section: Appendix B Discretization Methodsmentioning

confidence: 99%

“…The permanent magnet device (PM I) shown schematically in Fig.4.1 is used for the experiments [60]. The magnetic field is generated by two cylindrical nested Halbach arrays [108]. Each array has a magnetic field transverse to the bore direction.…”

Section: Description Of the Experimental Apparatusmentioning

confidence: 99%

A concise approach for building the $s-T$ diagram for Mn–Fe–P–Si hysteretic magnetocaloric material

Christiaanse¹,

Campbell²,

Trevizoli³

et al. 2017

J. Phys. D: Appl. Phys.

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“…Such permanent magnets consist of only the permanent magnet material or a combination of the material and a soft ferromagnetic material. In 2015, Trevizoli et al reported the design and experimental validation of a nested Halbach assembly. A numerical simulation of a multi‐polar Halbach cylindrical magnet was also conducted by You et al in 2016 .…”

Section: Magnetocaloric Refrigeration and Heat Pumpingmentioning

confidence: 99%

“…The examples in Figure 10 show the most commonly applied operational principles. In the case of a nested Halbach structure (see, e.g., study by Trevizoli et al), the internal or the external ring of the permanent‐magnet structure rotates while the other ring remains at rest, thus periodically magnetizing/demagnetizing the static magnetocaloric regenerator. The operational principal of the Halbach‐iron assembly (see, e.g., study by Bjørk et al) is similar to that of the nested Halbach assembly.…”

Section: Magnetocaloric Refrigeration and Heat Pumpingmentioning

confidence: 99%

Energy Applications of Magnetocaloric Materials

Kitanovski

2020

Advanced Energy Materials

359

156

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The need for energy‐efficient and environmentally friendly refrigeration, heat pumping, air conditioning, and thermal energy harvesting systems is currently more urgent than ever. Magnetocaloric energy conversion is among the best available alternatives for achieving these technological goals and has been the subject of substantial basic and applied research over the last two decades. The subject is strongly interdisciplinary, requiring proper understanding and efficient integration of knowledge in different specialized fields. This review article presents a historical and up‐to‐date account of the energy‐related applications of magnetocaloric materials and information about their processing and magnetic fields, thermodynamics, heat transfer, and other relevant characteristics. The article also discusses the conceptual design of magnetocaloric refrigeration and power generation systems and some guidelines for future research in the field.

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“…(1) The main components of a thermomagnetic motor are the permanent magnet magnetic circuit (MC), the MM, the fluid flow system and a mechanism to convert the magnetic force into usable work (work done by a shaft). The MC is the most expensive and complex component and can be designed with different sizes and shapes such as a hollow cylinder [10], C-shape Halbach circuit [11] or Nested Halbach Cylinders [12]. Bjørk [13] described different permanent magnet MC configurations and proposed a figure of merit to evaluate the "performance" of a magnet applied to a magnetic cooling system.…”

Section: Introductionmentioning

confidence: 99%

Design and assembling of a magnetic circuit for a thermomagnetic motor apparatus

Kaneko

Souza

Moro

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

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A thermomagnetic motor operates due to magnetization variation of magnetic materials around their transition or Curie temperature. The main components of these motors are the magnetic material (MM) and the magnetic circuit (MC). If the MM presents the transition temperature around room temperature, it may have potential to be used in thermomagnetic motors. Based on the current state-of-the-art, several first-and second-order transition magnetic materials with Curie temperature of 20 °C and above are known, and some of them present high magnetocaloric effect. The MC is responsible to guarantee a high magnetic field region which magnetically interacts with the MM. This way, the main objective of the present paper is the design and assembly of a double-C permanent magnet magnetic circuit, as part of a novel thermomagnetic motor design. Several 2D and 3D simulations were performed using COMSOL Multiphysics V5.3, which is a finite element analysis software for multiphysics simulation. Based on the simulation results, the MC was designed and built. After the construction, simulation results for magnetic field intensity and profiles along the transversal and axial directions were compared with experimental measurements, and a good agreement was verified.

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Design of nested Halbach cylinder arrays for magnetic refrigeration applications

Cited by 57 publications

References 26 publications

A concise approach for building the $s-T$ diagram for Mn–Fe–P–Si hysteretic magnetocaloric material

A concise approach for building the $s-T$ diagram for Mn–Fe–P–Si hysteretic magnetocaloric material

Energy Applications of Magnetocaloric Materials

Design and assembling of a magnetic circuit for a thermomagnetic motor apparatus

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