Summary
Current models of Active Magnetic Regenerative Refrigeration (AMRR) cycles are not able to capture the effect of magnetic hysteresis and are therefore strictly limited to second order magnetic transition (SOMT) materials. The discovery of the giant magnetocaloric effect (GMCE) in first order magnetic transition (FOMT) materials has generated substantial interest. FOMTs yield large adiabatic temperature changes but also exhibit significant magnetic hysteresis. This work quantifies the effects of magnetic hysteresis. Thermodynamically, hysteresis is treated as a source of entropy generation that is proportional to the area swept by the hysteresis loop experienced locally by the material during one refrigeration cycle. The 1-D numerical model presented by Engelbrecht (2008) is modified to include magnetic hysteresis. Hysteresis losses are shown to be directly proportional to regenerator volume. Therefore, at large refrigeration capacity to volume ratios, AMRR beds using layered FOMT materials significantly outperform the same cycle using layered SOMT refrigerants.
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Details
- Original title: Thermodynamic modeling of magnetic hysteresis in AMRR cycles.
- Record ID : 30012496
- Languages: English
- Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 47
- Publication date: 2014/11
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Indexing
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Themes:
Caloric cooling (magnetocaloric, electrocaloric, elastocaloric and barocaloric cooling);
Other refrigerating systems (desiccant cooling, thermoelectrics, thermoacoustics…) - Keywords: Thermodynamics; Refrigerating system; Magnetocaloric cooling; Magnetic property; Modelling; Magnetocaloric effect
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Thermoelectric–magnetocaloric energy conversion.
- Author(s) : TOMC U., TUSEK J., KITANOVSKI A., et al.
- Date : 2012/09/17
- Languages : English
- Source: 5th International Conference on Magnetic Refrigeration at Room Temperature (Thermag V). Proceedings: Grenoble, France, September 17-20, 2012.
- Formats : PDF
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Magnetocaloric versus thermoelectric effect: ne...
- Author(s) : GRÖSSINGER R., HAAS M., SATO TURTELLI R.
- Date : 2010/08/23
- Languages : English
- Source: 4th International Conference on Magnetic Refrigeration at Room Temperature (Thermag IV). Proceedings: Baotou, China, August 23-27, 2010.
- Formats : PDF
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Thermag 2018
- Organiser : IIF-IIR, Funktionale Materialien
- Date : 2018/09/16
- Languages : English
- Formats : CD-Rom, PDF
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Simplified modeling of active magnetic regenera...
- Author(s) : BURDYNY T., ROWE A.
- Date : 2013/05
- Languages : English
- Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 36 - n. 3
- Formats : PDF
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Performance modeling of AMR refrigerators.
- Author(s) : BURDYNY T., RUEBSAAT-TROTT A., ROWE A.
- Date : 2014/01
- Languages : English
- Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 37 - n. 1
- Formats : PDF
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