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

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Listed:
  • Angelo Maiorino

    (Department of Industrial Engineering, Università di Salerno, Via Giovanni Paolo II, 132, Fisciano, 84084 Salerno, Italy)

  • Antongiulio Mauro

    (Department of Industrial Engineering, Università di Salerno, Via Giovanni Paolo II, 132, Fisciano, 84084 Salerno, Italy)

  • Manuel Gesù Del Duca

    (Department of Industrial Engineering, Università di Salerno, Via Giovanni Paolo II, 132, Fisciano, 84084 Salerno, Italy)

  • Adrián Mota-Babiloni

    (ISTENER Research Group, Department of Mechanical Engineering and Construction, Campus de Riu Sec s/n, Universitat Jaume I, E-12071 Castelló de la Plana, Spain)

  • Ciro Aprea

    (Department of Industrial Engineering, Università di Salerno, Via Giovanni Paolo II, 132, Fisciano, 84084 Salerno, Italy)

Abstract

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.

Suggested Citation

  • Angelo Maiorino & Antongiulio Mauro & Manuel Gesù Del Duca & Adrián Mota-Babiloni & Ciro Aprea, 2019. "Looking for Energy Losses of a Rotary Permanent Magnet Magnetic Refrigerator to Optimize Its Performances," Energies, MDPI, vol. 12(22), pages 1-21, November.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:22:p:4388-:d:288398
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    References listed on IDEAS

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    1. Klinar, Katja & Tomc, Urban & Jelenc, Blaž & Nosan, Simon & Kitanovski, Andrej, 2019. "New frontiers in magnetic refrigeration with high oscillation energy-efficient electromagnets," Applied Energy, Elsevier, vol. 236(C), pages 1062-1077.
    2. Lucia, Umberto, 2008. "General approach to obtain the magnetic refrigeretion ideal coefficient of performance COP," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 387(14), pages 3477-3479.
    3. Lozano, J.A. & Engelbrecht, K. & Bahl, C.R.H. & Nielsen, K.K. & Eriksen, D. & Olsen, U.L. & Barbosa, J.R. & Smith, A. & Prata, A.T. & Pryds, N., 2013. "Performance analysis of a rotary active magnetic refrigerator," Applied Energy, Elsevier, vol. 111(C), pages 669-680.
    4. Qian, Suxin & Yuan, Lifen & Yu, Jianlin & Yan, Gang, 2018. "Variable load control strategy for room-temperature magnetocaloric cooling applications," Energy, Elsevier, vol. 153(C), pages 763-775.
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