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Performance analysis of a rotary active magnetic refrigerator

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  • 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.

Abstract

Performance results for a novel rotary active magnetic regenerator (AMR) and detailed numerical model of it are presented. The experimental device consists of 24 regenerators packed with gadolinium (Gd) spheres rotating inside a four-pole permanent magnet with magnetic field of 1.24T. A parametric study of the temperature span, cooling power, coefficient of performance (COP) and efficiency of the system was carried out over a range of different hot reservoir temperatures, volumetric flow rates and cooling powers. Detailed modeling of the AMR using a 1D model was performed and compared with the experimental results. An overall mapping of the thermal losses of the system was performed, and good agreement between the experimental and numerical results was found when parasitic heat losses were subtracted from the modeling results. The performance of the system was evaluated via the COP, the exergetic-equivalent cooling power (ExQ), and the overall second law efficiency, η2nd. Losses mapping indicated that friction and thermal leakage to the ambient are the most important contributors to the reduction of the system performance. Based on modeling results, improvements on the flow distributor design and reduction of the cold end thermal parasitic losses are expected to enhance the efficiency of the system. For an operating frequency of 1.5Hz, a volumetric flow rate of 400L/h, a hot reservoir temperature of 297.7K, and thermal loads of 200 and 400W, the obtained temperature spans, ΔTS, were 16.8K and 7.1K, which correspond to COPs of 0.69 and 1.51, respectively. The maximum overall second-law efficiency was 5.6% for a ΔTS of 12.9K at 500L/h and 400W.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:appene:v:111:y:2013:i:c:p:669-680
    DOI: 10.1016/j.apenergy.2013.05.039
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    References listed on IDEAS

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    1. Silva, D.J. & Bordalo, B.D. & Pereira, A.M. & Ventura, J. & Araújo, J.P., 2012. "Solid state magnetic refrigerator," Applied Energy, Elsevier, vol. 93(C), pages 570-574.
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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. Bianchi, Giuseppe & Cipollone, Roberto, 2015. "Theoretical modeling and experimental investigations for the improvement of the mechanical efficiency in sliding vane rotary compressors," Applied Energy, Elsevier, vol. 142(C), pages 95-107.
    3. Ali Alahmer & Malik Al-Amayreh & Ahmad O. Mostafa & Mohammad Al-Dabbas & Hegazy Rezk, 2021. "Magnetic Refrigeration Design Technologies: State of the Art and General Perspectives," Energies, MDPI, vol. 14(15), pages 1-26, July.
    4. Silva, D.J. & Ventura, J. & Araújo, J.P. & Pereira, A.M., 2014. "Maximizing the temperature span of a solid state active magnetic regenerative refrigerator," Applied Energy, Elsevier, vol. 113(C), pages 1149-1154.
    5. Scarpa, Federico & Tagliafico, Giulio & Tagliafico, Luca A., 2015. "A classification methodology applied to existing room temperature magnetic refrigerators up to the year 2014," Renewable and Sustainable Energy Reviews, Elsevier, vol. 50(C), pages 497-503.
    6. Aprea, C. & Greco, A. & Maiorino, A. & Masselli, C., 2018. "Solid-state refrigeration: A comparison of the energy performances of caloric materials operating in an active caloric regenerator," Energy, Elsevier, vol. 165(PA), pages 439-455.
    7. 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.
    8. Trevizoli, Paulo V. & Nakashima, Alan T. & Peixer, Guilherme F. & Barbosa, Jader R., 2017. "Performance assessment of different porous matrix geometries for active magnetic regenerators," Applied Energy, Elsevier, vol. 187(C), pages 847-861.
    9. Ismail, A. & Perrin, M. & Giurgea, S. & Bailly, Y. & Roy, J.C. & Barriere, T., 2022. "Multiphysical and multidimensional modelling of Parallel-Plate active magnetic regenerator," Applied Energy, Elsevier, vol. 314(C).
    10. 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.
    11. Kamran, Muhammad Sajid & Ahmad, Hafiz Ozair & Wang, Hua Sheng, 2020. "Review on the developments of active magnetic regenerator refrigerators – Evaluated by performance," Renewable and Sustainable Energy Reviews, Elsevier, vol. 133(C).
    12. Teyber, Reed & Holladay, Jamelyn & Meinhardt, Kerry & Polikarpov, Evgueni & Thomsen, Edwin & Cui, Jun & Rowe, Andrew & Barclay, John, 2019. "Performance investigation of a high-field active magnetic regenerator," Applied Energy, Elsevier, vol. 236(C), pages 426-436.

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