Comparison between a 1D and a 2D numerical model of an active magnetic regenerative refrigerator

Petersen, Thor Ugelvig; Engelbrecht, Kurt; Bahl, Christian; Elmegaard, Brian; Pryds, Nini; Smith, Anders

doi:10.1088/0022-3727/41/10/105002

Cited by 45 publications

(23 citation statements)

References 6 publications

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“…IV and V results from a previously published numerical two-dimensional ͑2D͒ model 8,9 are compared to results obtained from an experimental magnetic refrigeration device. A good qualitative and, to some extent, quantitative agreement between the model predictions and experimental results will be demonstrated.…”

Section: Introductionmentioning

confidence: 99%

A versatile magnetic refrigeration test device

Bahl

Petersen

Pryds

et al. 2008

Review of Scientific Instruments

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A magnetic refrigeration test device has been built and tested. The device allows variation and control of many important experimental parameters, such as the type of heat transfer fluid, the movement of the heat transfer fluid, the timing of the refrigeration cycle, and the magnitude of the applied magnetic field. An advanced two-dimensional numerical model has previously been implemented in order to help in the optimization of the design of a refrigeration test device. Qualitative agreement between the results from model and the experimental results is demonstrated for each of the four different parameter variations mentioned above.

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Section: Introductionmentioning

confidence: 99%

A versatile magnetic refrigeration test device

Bahl

Petersen

Pryds

et al. 2008

Review of Scientific Instruments

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“…To verify the developed model, simulation of a single-layer AMR made of Gd using water as the heat transfer fluid with published results from Petersen et al . 44 (numerical results) were compared, since Petersen et al . 44 provide the comprehensive parameters in their paper to benefit the comparison.…”

Section: Numerical Methods and Verificationmentioning

confidence: 99%

A numerical analysis of a magnetocaloric refrigerator with a 16-layer regenerator

Zhang

Abdelaziz

Momen

et al. 2017

Sci Rep

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A numerical analysis was conducted to study a room temperature magnetocaloric refrigerator with a 16-layer parallel plates active magnetic regenerator (AMR). Sixteen layers of LaFeMnSiH having different Curie temperatures were employed as magnetocaloric material (MCM) in the regenerator. Measured properties data was used. A transient one dimensional (1D) model was employed, in which a unique numerical method was developed to significantly accelerate the simulation speed of the multi-layer AMR system. As a result, the computation speed of a multi-layer AMR case was very close to the single-layer configuration. The performance of the 16-layer AMR system in different frequencies and utilizations has been investigated using this model. To optimize the layer length distribution of the 16-layer MCMs in the regenerator, a set of 137 simulations with different MCM distributions based on the Design of Experiments (DoE) method was conducted and the results were analyzed. The results show that the 16-layer AMR system can operate up to 84% of Carnot cycle COP at a temperature span of 41 K, which cannot be obtained using an AMR with fewer layers. The DoE results indicate that for a 16-layer AMR system, the uniform distribution is very close to the optimized design.

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“…In Petersen et al [82], a direct comparison of 1-D and 2-D models for a parallelplate AMR is shown. The authors concluded that both models show an excellent qualitative and quantitative agreement between the cooling and heating powers for thin regenerator channels.…”

Section: Mathematical (Physical) Model Of An Amr (Basic Energy Balancmentioning

confidence: 99%

Active Magnetic Regeneration

Kitanovski

Tušek

Tomc

et al. 2014

Magnetocaloric Energy Conversion

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It is well known that the magnetocaloric effect of most magnetocaloric materials at moderate magnetic fields (up to 1.5 T) is limited to a maximum adiabatic temperature change of 5 K [1,2]. This value is not sufficient for such materials to be directly implemented into a practical cooling or heating device where temperature span over 30 K is required. Therefore, in order to increase the temperature span, one and so far the best option is for a heat regenerator to be included in the magnetic thermodynamic cycle.A heat regenerator is a type of indirect heat exchanger where the heat is periodically stored and transferred from/to a thermal storage medium (regenerative material) by a working (heat-transfer) fluid. The regenerative material usually has a porous structure, through which a working fluid is pumped in an oscillatory, counter-flow manner (which is more efficient than a parallel flow system). During the 'hot period', a warmer fluid flows through the regenerative material, which cools down, while the material heats up. As a result, heat is stored in the material. During the 'cold period', a cooler fluid flows through previously heated regenerative material, so the fluid heats up, while the material cools down. The heat is therefore transferred back to the fluid (the same fluid or a different one) at a different phase of the thermodynamic cycle. After a certain number of such steps, a periodic steady state is reached and, as a result, a temperature profile can be established along the length of the regenerator [3].The need to apply heat regenerators in a magnetic refrigerator was already realized by Brown [4] in the first prototype of a magnetic refrigerator, built in 1976. He applied a regenerative Stirling-like thermodynamic cycle (very similar to AMR), which significantly increased the temperature span of the device [4,5]. A few years later Steyert [6] and Barclay and Steyert [7] presented and explained the active magnetic regenerator, which remains the most applied method for the exploitation of the magnetocaloric effect at room temperature. Furthermore, all prototypes of magnetic refrigerators built since then have been based on the AMR process [5]. An AMR, unlike a passive (regular) heat regenerator, contains a magnetocaloric material as the regenerative material. It has a double function in a magnetic regenerator, i.e. it works as a regenerator and enables an increase in the temperature span as well as working as a coolant and generating/absorbing heat between the particular phases of the

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Comparison between a 1D and a 2D numerical model of an active magnetic regenerative refrigerator

Cited by 45 publications

References 6 publications

A versatile magnetic refrigeration test device

A versatile magnetic refrigeration test device

A numerical analysis of a magnetocaloric refrigerator with a 16-layer regenerator

Active Magnetic Regeneration

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