Influence of irreversible losses on the performance of a two-stage magnetic Brayton refrigeration cycle

Zhang, X.; Chen, Jiangxi; Lin, Gan; Brück, E.

doi:10.1016/j.physb.2009.12.058

Cited by 10 publications

(3 citation statements)

References 26 publications

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“…Although the analysis and design of some magnetic Brayton refrigeration cycles has been undertaken [25][26][27], research on the performance of the magnetic Brayton refrigeration cycle is relatively rare [28][29][30]. In fact, the magnetic Brayton refrigeration cycle is also a significant regenerative cycle.…”

Section: Citationmentioning

confidence: 99%

Optimization of the performance characteristics in an irreversible regeneration magnetic Brayton refrigeration cycle

Wang

2012

Sci. China Phys. Mech. Astron.

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A model of the irreversible regenerative Brayton refrigeration cycle working with paramagnetic materials is established, in which the regeneration problem in two constant-magnetic field processes and the irreversibility in two adiabatic processes are considered synthetically. Expressions for the COP, cooling rate, power input, the minimum ratio of the two magnetic fields, etc., are derived. It is found that the influence of the irreversibility and the regeneration on the main performance parameters of the magnetic Brayton refrigerator is remarkable. It is important that we have obtained several optimal criteria, which may provide some theoretical basis for the optimal design and operation of the Brayton refrigerator. The results obtained in the paper can provide some new theoretical information for the optimal design and performance improvement of real Brayton refrigerators. paramagnetic salt, Brayton refrigeration, irreversibility, regeneration, performance characteristics, optimum criterion PACS number(s): 75.30.Sg, 07.20.Mc Citation:Wang H, Wu G X. Optimization of the performance characteristics in an irreversible regeneration magnetic Brayton refrigeration cycle.The conventional vapor compression refrigerator widely used in many fields has many disadvantages such as the energy efficiency being difficult to improve further, the gases used enhance the greenhouse effect or deplete the ozone layer, and so on. Magnetic refrigeration is an environment-safe refrigeration technology which has been studied for a long time [1][2][3][4][5] for its potential use in refrigeration cycles as an alternative to gases, especially at low temperatures. As more and more attention is paid to environmental protection and investigations on room-temperature magnetic refrigeration materials, magnetic refrigeration theory and technology have had a great development [6-11]. Optimal analysis and design of magnetic refrigeration cycles [12][13][14][15][16][17] have become one of the interesting research subjects for people working in thermodynamics and statistical physics. Moreover, most of the literature has only researched the optimal performance characteristics of a magnetic Stirling [18][19][20] or Ericsson refrigeration cycle [21][22][23][24].The magnetic Brayton refrigeration cycle is one of the important refrigeration cycles and has some distinct merits that are noteworthy in the research and manufacture of roomtemperature magnetic refrigerators. Although the analysis and design of some magnetic Brayton refrigeration cycles has been undertaken [25][26][27], research on the performance of the magnetic Brayton refrigeration cycle is relatively rare [28][29][30]. In fact, the magnetic Brayton refrigeration cycle is also a significant regenerative cycle. Therefore, it is necessary to consider both the regenerative and other irreversible effects on a magnetic Brayton refrigeration cycle.In the article, we investigate the main characteristics of an irreversible regenerative magnetic Brayton refrigeration cycle. The paper is organized as ...

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Section: Citationmentioning

confidence: 99%

Optimization of the performance characteristics in an irreversible regeneration magnetic Brayton refrigeration cycle

Wang

2012

Sci. China Phys. Mech. Astron.

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“…Magnetic refrigeration is an environmentally friendly refrigeration technology, which employs magneto-caloric materials as refrigerants based on the magnetocaloric effect (MCE) [2], and its refrigeration efficiency may attain 60% Carnot efficiency [3]. In spite of its high energy efficiency, small refrigeration capacity or narrow refrigeration temperature span restricts its commercialization [4]. Therefore, exploring new magnetic refrigeration materials with giant MCE and investigating magnetocaloric characteristic of MCE materials are extremely important contents [5].…”

Section: Introductionmentioning

confidence: 99%

Investigation on Magnetocaloric Characteristics of Room Temperature Magnetic Refrigeration Materials GD, Gder and Gddy

Zhimin¹,

Yang²,

Xu³

et al. 2020

Preprint

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By means of the de Gennes model, the magnetocaloric characteristics of Gd-R (R= Dy, Er) alloys as well as Gd, which are materials for sustainable energy, are investigated and the related theoretical and experimental results are compared. The effects of Rdoped concentrations on the Curie temperature of Gd-R alloys are revealed. Furthermore, the dependencies of temperature of the heat capacities and adiabatic temperature changes of Gd, Gd0.95Dy0.05, and Gd0.95Er0.05 under 0 and 2T applied magnetic fields are analyzed and discussed. The calculated results shows that the Curie temperatures of these materials decrease with increasing R-doped concentration; the effect of magnetization/demagnetization on the adiabatic temperature change of Gd-R alloys is weak, but on the temperature at maximum adiabatic temperature change of Gd-R alloys is relatively evident. The calculation results in the present paper may provide some references for the parametric design of room temperature magnetic refrigerators that are energy conversion devices with environmental protection and energy saving.

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“…[29][30][31][32][33][34] In recent years, the performance optimization of magnetic cycles (magnetic engines, magnetic refrigerators, and magnetic heat pumps) has become one of the most interesting research subjects. However, most of the literature has only researched the optimal performance characteristics of magnetic Carnot, [35] Brayton, [36][37][38][39][40][41][42][43] Stirling, [44][45][46][47] and Ericsson [48][49][50][51][52] refrigeration cycles.…”

Section: Introductionmentioning

confidence: 99%

Ecological optimization for an irreversible magnetic Ericsson refrigeration cycle

Wang¹,

Wu²

2013

Chinese Phys. B

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An irreversible Ericsson refrigeration cycle model is established, in which multi-irreversibilities such as finite-rate heat transfer, regenerative loss, heat leakage, and the efficiency of the regenerator are taken into account. Expressions for several important performance parameters, such as the cooling rate, coefficient of performance (COP), power input, exergy output rate, entropy generation rate, and ecological function are derived. The influences of the heat leakage and the time of the regenerative processes on the ecological performance of the refrigerator are analyzed. The optimal regions of the ecological function, cooling rate, and COP are determined and evaluated. Furthermore, some important parameter relations of the refrigerator are revealed and discussed in detail. The results obtained here have general significance and will be helpful in gaining a deep understanding of the magnetic Ericsson refrigeration cycle.

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Influence of irreversible losses on the performance of a two-stage magnetic Brayton refrigeration cycle

Cited by 10 publications

References 26 publications

Optimization of the performance characteristics in an irreversible regeneration magnetic Brayton refrigeration cycle

Optimization of the performance characteristics in an irreversible regeneration magnetic Brayton refrigeration cycle

Investigation on Magnetocaloric Characteristics of Room Temperature Magnetic Refrigeration Materials GD, Gder and Gddy

Ecological optimization for an irreversible magnetic Ericsson refrigeration cycle

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