Experimental evaluation of a Gd-based linear reciprocating active magnetic regenerator test apparatus

Trevizoli, Paulo V.; Barbosa, Jader R.; Ferreira, R. T. S.

doi:10.1016/j.ijrefrig.2011.05.005

Cited by 54 publications

(17 citation statements)

References 15 publications

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“…Generally, the cooling power is linear in the temperature span, which has been reported previously in literature [26,27]. A slight kink is observed in Figs. 3(a) and 3(b) at a temperature span between one and five K. This is due to the Curie temperature (293 K) and the lower value of the utilization (φ = 0.5).…”

Section: Cooling Power As a Function Of Temperature Spansupporting

confidence: 84%

“…However, experimentally parallel plate AMRs have not been proven to perform as predicted by advanced models [12,13,14]. Similarly, in other related heat transfer applications applying parallel plate heat exchangers with flow channel hydraulic diameters in the micro regime, the experimentally determined performance is significantly smaller than theoretically predicted [15].…”

Section: Introductionmentioning

confidence: 99%

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The effect of flow maldistribution in heterogeneous parallel-plate active magnetic regenerators

Nielsen¹,

Bahl²,

Engelbrecht³

2013

J. Phys. D: Appl. Phys.

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Section: Cooling Power As a Function Of Temperature Spansupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

The effect of flow maldistribution in heterogeneous parallel-plate active magnetic regenerators

Nielsen¹,

Bahl²,

Engelbrecht³

2013

J. Phys. D: Appl. Phys.

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“…Considering the highest flow speed found in AMR literature ‫7.63=ݒ(‬ cm s -1 (Trevizoli et al, 2011)), assuming ∆ܶ=2 K and a mixture of water and glycol as the heat transfer fluid, a value of ‫01·2≈ܿܧ‬ -5 is obtained. Since ‫ܿܧ‬ is much lower than 1, it can be concluded that the viscous dissipation term is negligible in AMR operating conditions studied here.…”

Section: Fluid Equationmentioning

confidence: 99%

An efficient numerical scheme for the simulation of parallel-plate active magnetic regenerators

Torregrosa-Jaime

Corberán

Payá

et al. 2015

International Journal of Refrigeration

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A one-dimensional model of a parallel-plate active magnetic regenerator (AMR) is presented in this work. The model is based on an efficient numerical scheme which has been developed after analysing the heat transfer mechanisms in the regenerator bed. The new finite difference scheme optimally combines explicit and implicit techniques in order to solve the one-dimensional conjugate heat transfer problem in an accurate and fast manner while ensuring energy conservation. The present model has been thoroughly validated against passive regenerator cases with an analytical solution. Compared to the fully implicit scheme, the proposed scheme achieves more accurate results, prevents numerical errors and requires less computational effort. In AMR simulations the new scheme can reduce the computational time by 88%.

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“…First reciprocating magnetocaloric device in Brazil was built at the Federal University of Santa Catarina (Table 7.10) and presented in 2011 by Trevizoli et al [39].…”

Section: Brazilian Prototypesmentioning

confidence: 99%

Overview of Existing Magnetocaloric Prototype Devices

Kitanovski

Tušek

Tomc

et al. 2014

Magnetocaloric Energy Conversion

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Since Brown [1] built the first magnetic refrigerator prototype working near room temperature in 1976 there has been a large number of different prototypes [2] designed and built over the past 40 years. However, despite there being 4 decades of scientific input into the field of magnetocaloric energy conversion near room temperature, the technology is only now at the brink of commercialization. With every new prototype that is built, we see slow but measureable improvements toward the desired goal. Figure 7.1 shows the number of prototypes built until 2014. It is clear that the number of prototypes increases with each new year, pointing to the fact that the magnetocaloric energy conversion research community is expanding research activities together with the S-curve of technology development.The reasons why magnetocaloric technology near room temperature is only now slowly becoming market-ready lie in the fact that there are a number of different obstacles regarding the device's design, which need to be overcome before finalizing the idea of commercializing magnetocaloric technology. Addressing all the design issues is, of course, a difficult task. With each prototype built researchers try to solve different design issues, ranging from the heat-transfer problems of the AMRs and the working fluids, the design issues of the AMRs and magnet assemblies, to the problems related to peripheral elements, such as pump and valves systems. In this manner, each prototype built up until now has its own special feature. Each of them is trying to address one or more of the engineering barriers, but almost never a system as a whole.However, there is one major characteristic that can be distinguished for all the existing prototypes. There are two groups of devices, i.e. the ones operating in a reciprocating (linear motion) manner and the others operating in a rotary manner. The reciprocating and rotary operations of the magnetocaloric device are more or less related to the way how the AMR is exposed to the alternating magnetic field, as is described in Chap. 4 on Active Magnetic Regeneration (see also Chap. 8). One possibility is to move the AMR or the magnet in a reciprocal direction back and forth, and the other is to rotate the AMR or the magnet. As you will see in the following sections, each of the two methods has its pros and cons, depending on the functionality of the device. Is it an experimental testing device? Or is it a real

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Experimental evaluation of a Gd-based linear reciprocating active magnetic regenerator test apparatus

Cited by 54 publications

References 15 publications

The effect of flow maldistribution in heterogeneous parallel-plate active magnetic regenerators

The effect of flow maldistribution in heterogeneous parallel-plate active magnetic regenerators

An efficient numerical scheme for the simulation of parallel-plate active magnetic regenerators

Overview of Existing Magnetocaloric Prototype Devices

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