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Magnetic refrigeration is a cooling method based on the magnetocaloric effect, which uses solid magnetocaloric materials as refrigerant, and helium, water or other fluid as heat transfer fluids. Stirling refrigeration is a kind of mature gas regenerative cooling method, using helium gas as the refrigerant. These refrigerations have similar cycling characteristics, and are both safe, environmantal-friendly and high efficient cooling methods. Therefore, a hybrid magnetic refrigerator combined with Stirling gas refrigeration effect is proposed and designed. In our previous works for hybrid magnetic refrigeration, numerical simulation and experimental performance of the low-pressure hybrid magnetic refrigerator was carried out, and the cycling mechanism of hybrid magnetic refrigeration was also figured out. In this study, a numerical model for the high-pressure hybrid magnetic refrigeration cycle is established. The magnetic refrigeration materials are utilized as the regenerator matrix for both gas Stirling and active magnetic regenerative refrigeration in this model. Effects of gas Stirling and active magnetic regenerative refrigeration are combined to build a kind of high efficient refrigeration cycle. Ansys Fluent software is applied in this paper. Based on the physical model of hybrid refrigerator and the theories of magnetocaloric effect and numerical calculation of regenerator, computational fluid dynamics (CFD) model of high-pressure hybrid magnetic refrigerator is established. This paper describes the internal heat transfer mechanism of Stirling and magnetic refrigeration effect in an active regenerator. Some parameters of the model such as working frequency and utilization are analyzed and the best phase angle is figured out in order to couple these two cooling effects positively. Simulation results show that Stirling and magnetic cooling effects can be coupled positively at phase angle of 60o. Results also show that with increasing system pressure, which means to increase the utilization of the system, the system frequency can enhance the cooling performance of the system as well as improve the coefficient of performance (COP) of it. The results and analysis of the numerical model will be helpful for the construction of experimental prototype in our future work.
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Keywords:
- numerical simulation /
- magnetic refrigeration /
- hybrid systems
[1] Shao Y Z, Xiong Z Y, Zhang J L, Zhang J X 1996 Acta Phys. Sin. 45 1749 (in Chinese) [邵元智, 熊正烨, 张介立, 张进修 1996 45 1749]
[2] Wang Y T, Liu Z D, Yi J, Xue Z Y 2012 Acta Phys. Sin. 61 056102 (in Chinese) [王永田, 刘宗德, 易军, 薛志勇 2012 61 056102]
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[5] Yayama H, Hatta Y, Makimoto Y, Tomokiyo A 2000 Jpn. J. Appl. Phys. 39 4220
[6] Kim Y, Jeong S 2011 Int. J. Refrig. 34 204
[7] Zhang H, He X N, Shen J, Gong M Q, Wu J F 2013 Journal of Engineering Thermophysics 34 5 (in Chinese) [张弘, 和晓楠, 沈俊, 公茂琼, 吴剑峰 2013 工程热 34 5]
[8] He X N, Gong M Q, Zhang H, Shen J, Dai W, Wu J F 2013 Journal of Engineering Thermophysics 34 1997 (in Chinese) [和晓楠, 公茂琼, 张弘, 沈俊, 戴巍, 吴剑峰 2013 工程热 34 1997]
[9] He X N, Gong M Q, Zhang H, Shen J, Wu J F 2013 Cryo. & Supercond. 41 13 (in Chinese) [和晓楠, 公茂琼, 张弘, 沈俊, 吴剑峰 2013 低温与超导 41 13]
[10] He X N, Gong M Q, Zhang H, Dai W, Shen J, Wu J F 2013 Int. J. Refrig. 36 1465
[11] Nielsen K K, Bahl C R H, Smith A, Pryds N, Hattel J 2010 Int. J. Refrig. 33 753
[12] Nielsen K K, Tusek J, Engelbrecht K, Schopfer S, Kitanovski A, Bahl C R H, Smith A, Pryds N, Poredos A 2010 Int. J. Refrig. 34 603
[13] Silva D J, Ventura J, Araujo J P, Pereira A M 2014 Applied Energy 113 1149
[14] Chiba Y, Smaili A, Mahmed C, Balli M, Sari O 2014 Int. J. Refrig. 37 36
[15] Lionte S, Vasile C, Siroux M 2015 Appl. Therm. Eng. 75 871
[16] Li P, Gong M Q, Yao G H, Wu J F 2006 Int. J. Refrig. 29 1259
[17] Yu B F, Zhang Y, Gao Q, Yang D X 2006 Int. J. Refrig. 29 1348
[18] Tao W Q 2001 Numerical Heat Transfer(Second Edition) (Xian: Xi'an Jiaotong University Press) p15 (in Chinese) [陶文铨 2001 数值传热学(第二版)(西安: 西安交通大学出版社)第15页]
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[1] Shao Y Z, Xiong Z Y, Zhang J L, Zhang J X 1996 Acta Phys. Sin. 45 1749 (in Chinese) [邵元智, 熊正烨, 张介立, 张进修 1996 45 1749]
[2] Wang Y T, Liu Z D, Yi J, Xue Z Y 2012 Acta Phys. Sin. 61 056102 (in Chinese) [王永田, 刘宗德, 易军, 薛志勇 2012 61 056102]
[3] Bjork R, Bahl C R H, Katter M 2010 J. Magn. Magn. Mater. 322 3882
[4] Nellis G F, Smith J L Jr 1996 Advances in Cryogenic Engineering 41 1665
[5] Yayama H, Hatta Y, Makimoto Y, Tomokiyo A 2000 Jpn. J. Appl. Phys. 39 4220
[6] Kim Y, Jeong S 2011 Int. J. Refrig. 34 204
[7] Zhang H, He X N, Shen J, Gong M Q, Wu J F 2013 Journal of Engineering Thermophysics 34 5 (in Chinese) [张弘, 和晓楠, 沈俊, 公茂琼, 吴剑峰 2013 工程热 34 5]
[8] He X N, Gong M Q, Zhang H, Shen J, Dai W, Wu J F 2013 Journal of Engineering Thermophysics 34 1997 (in Chinese) [和晓楠, 公茂琼, 张弘, 沈俊, 戴巍, 吴剑峰 2013 工程热 34 1997]
[9] He X N, Gong M Q, Zhang H, Shen J, Wu J F 2013 Cryo. & Supercond. 41 13 (in Chinese) [和晓楠, 公茂琼, 张弘, 沈俊, 吴剑峰 2013 低温与超导 41 13]
[10] He X N, Gong M Q, Zhang H, Dai W, Shen J, Wu J F 2013 Int. J. Refrig. 36 1465
[11] Nielsen K K, Bahl C R H, Smith A, Pryds N, Hattel J 2010 Int. J. Refrig. 33 753
[12] Nielsen K K, Tusek J, Engelbrecht K, Schopfer S, Kitanovski A, Bahl C R H, Smith A, Pryds N, Poredos A 2010 Int. J. Refrig. 34 603
[13] Silva D J, Ventura J, Araujo J P, Pereira A M 2014 Applied Energy 113 1149
[14] Chiba Y, Smaili A, Mahmed C, Balli M, Sari O 2014 Int. J. Refrig. 37 36
[15] Lionte S, Vasile C, Siroux M 2015 Appl. Therm. Eng. 75 871
[16] Li P, Gong M Q, Yao G H, Wu J F 2006 Int. J. Refrig. 29 1259
[17] Yu B F, Zhang Y, Gao Q, Yang D X 2006 Int. J. Refrig. 29 1348
[18] Tao W Q 2001 Numerical Heat Transfer(Second Edition) (Xian: Xi'an Jiaotong University Press) p15 (in Chinese) [陶文铨 2001 数值传热学(第二版)(西安: 西安交通大学出版社)第15页]
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