Design and performance of a room-temperature hybrid magnetic refrigerator combined with Stirling gas refrigeration effect

Xiao-hong, HE; Gong, Maoqiong; Zhang, Hongrui; Dai, Wei; Shen, Jun; Wu, Ji

doi:10.1016/j.ijrefrig.2013.03.014

Cited by 23 publications

(6 citation statements)

References 24 publications

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“…For the most common application of refrigeration, any magnetocaloric effect-exhibiting material that is to be considered a viable option as a heat exchanger within a heat pump must be formed with a high surface-to-volume ratio and must allow satisfactory fluid flow [188,189]. Thus, the following two requirements are placed upon the heat exchanger [190] Common methods for producing heat exchanger devices from magnetocaloric effect materials are [190]: packed powder beds [191][192][193], parallel plates [194][195][196][197], and microchannel systems [198]. Packed powder beds, though cheap and simple, have a high pressure drop across the device due to the presence of turbulent flow.…”

Section: Additive Manufacturing Of Magnetocaloric Materialsmentioning

confidence: 99%

Additive Manufacturing from the Point of View of Materials Research

Laitinen

Merabtene

Stevens

et al. 2020

Technical, Economic and Societal Effects of Manufacturing 4.0

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Section: Additive Manufacturing Of Magnetocaloric Materialsmentioning

confidence: 99%

Additive Manufacturing from the Point of View of Materials Research

Laitinen

Merabtene

Stevens

et al. 2020

Technical, Economic and Societal Effects of Manufacturing 4.0

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“…The second prototype was built at the Technical Institute of Physics and Chemistry from the Chinese Academy of Sciences and was presented in 2013 by He et al [59]. This was a hybrid device, which employed active magnetic regeneration as well as Stirling gas regenerative refrigeration effect.…”

Section: Chinese 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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“…Energy efficiency is one of the crucial characteristics to allow this technology becoming mature for markets, as well as to compare different system concepts. Several strategies to improve energy efficiency have been explored, whether focusing on theoretical aspects and thermodynamic cycles [22][23][24] or performing extensive studies on system energy performances [10,[25][26][27], as well as coupling magnetic refrigerators with systems such as Stirling motors, geothermal probes, and ejectors [28][29][30][31]. Furthermore, different studies have been conducted on the optimal control of magnetic cooling devices to improve their performance, using both an experimental [32] and a modelling approach [33,34].…”

Section: Introductionmentioning

confidence: 99%

Looking for Energy Losses of a Rotary Permanent Magnet Magnetic Refrigerator to Optimize Its Performances

et al. 2019

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In this paper, an extensive study on the energy losses of a magnetic refrigerator prototype developed at University of Salerno, named ‘8MAG’, is carried out with the aim to improve the performance of such a system. The design details of ‘8MAG’ evidences both mechanical and thermal losses, which are mainly attributed to the eddy currents generation into the support of the regenerators (magnetocaloric wheel) and the parasitic heat load of the rotary valve. The latter component is fundamental since it imparts the direction of the heat transfer fluid distribution through the regenerators and it serves as a drive shaft for the magnetic assembly. The energy losses concerning eddy currents and parasitic heat load are evaluated by two uncoupled models, which are validated by experimental data obtained with different operating conditions. Then, the achievable coefficient of performance (COP) improvements of ‘8MAG’ are estimated, showing that reducing eddy currents generation (by changing the material of the magnetocaloric wheel) and the parasitic heat load (enhancing the insulation of the rotary valve) can lead to increase the COP from 2.5 to 2.8 (+12.0%) and 3.0 (+20%), respectively, and to 3.3 (+32%), combining both improvements, with an hot source temperature of 22 °C and 2 K of temperature span.

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Design and performance of a room-temperature hybrid magnetic refrigerator combined with Stirling gas refrigeration effect

Cited by 23 publications

References 24 publications

Additive Manufacturing from the Point of View of Materials Research

Additive Manufacturing from the Point of View of Materials Research

Overview of Existing Magnetocaloric Prototype Devices

Looking for Energy Losses of a Rotary Permanent Magnet Magnetic Refrigerator to Optimize Its Performances

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