Variable load control strategy for room-temperature magnetocaloric cooling applications

Qian, Suxin; Li, Yuan; Yu, Jianlin; Yan, Gang

doi:10.1016/j.energy.2018.04.104

Cited by 22 publications

(10 citation statements)

References 40 publications

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“…An increase of the operation frequency to 3 Hz decreased the second‐law efficiency to about 40%. Qian et al used the Simulink software to model a room‐temperature magnetocaloric cooling system, in one of the first examples of the approach. They considered a linear system consisting of a tandem of two active magnetic regenerators and a permanent magnet assembly.…”

Section: Magnetocaloric Refrigeration and Heat Pumpingmentioning

confidence: 99%

Energy Applications of Magnetocaloric Materials

Kitanovski

2020

Advanced Energy Materials

355

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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Section: Magnetocaloric Refrigeration and Heat Pumpingmentioning

confidence: 99%

Energy Applications of Magnetocaloric Materials

Kitanovski

2020

Advanced Energy Materials

355

156

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“…3, this leads to modest performances (average seasonal COP of 1.84) compared to the optimum operation point of this MCHP [37]. The development of control strategies adjusting fluid flow and operation frequency of the MCHP for efficient partial-load operation is thus very important [41]. [37].…”

Section: Magnetocaloric Technologymentioning

confidence: 99%

Integration of a magnetocaloric heat pump in an energy flexible residential building

et al. 2019

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“…In Figure 16, the COP improvement obtained with this solution is shown, both in absolute (∆COP) and relative (% ∆COP) terms. It was calculated according to Equations ( 32) and (33).…”

Section: Cop Improvement By Reducing Eddy Currentsmentioning

confidence: 99%

“…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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Variable load control strategy for room-temperature magnetocaloric cooling applications

Cited by 22 publications

References 40 publications

Energy Applications of Magnetocaloric Materials

Energy Applications of Magnetocaloric Materials

Integration of a magnetocaloric heat pump in an energy flexible residential building

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

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