Ideal magnetocaloric effect for active magnetic regenerators
| dc.contributor.author | Rowe, A.M. | |
| dc.contributor.author | Barclay, J.A. | |
| dc.date.accessioned | 2013-05-10T18:01:12Z | |
| dc.date.available | 2013-05-10T18:01:12Z | |
| dc.date.copyright | 2003 | en_US |
| dc.date.issued | 2003 | |
| dc.description.abstract | The active magnetic regenerator (AMR) uses a magnetic solid as a thermal storage medium and as a working material in a refrigeration cycle. Thermodynamically coupled to a heat transfer fluid, the regenerator produces a cooling effect and generates a temperature gradient across the AMR. The coupling between the heat transfer fluid and the magnetic refrigerant is a key aspect governing the operating characteristics of an AMR. To increase our understanding of AMR thermodynamics, we examine the entropy balance in an idealized active magnetic regenerator. A relation for the entropy generation in an AMR with varying fluid capacity ratios is derived. Subsequently, an expression describing the ideal magnetocaloric effect (MCE) as a function of temperature is developed for the case of zero entropy generation. Finally, the link between ideal MCE and refrigerant symmetry is discussed showing that an ideal reverse Brayton-type magnetic cycle cannot be achieved using materials undergoing a second-order magnetic phase transition. | en_US |
| dc.description.reviewstatus | Reviewed | en_US |
| dc.description.scholarlevel | Faculty | en_US |
| dc.description.uri | http://link.aip.org/link/doi/10.1063/1.1536016 | |
| dc.identifier.citation | J. Appl. Phys. 93, 1672 (2003) | en_US |
| dc.identifier.issn | 1089-7550 | |
| dc.identifier.uri | http://hdl.handle.net/1828/4616 | |
| dc.identifier.uri | http://link.aip.org/link/doi/10.1063/1.1536016 | |
| dc.language.iso | en | en_US |
| dc.publisher | American Institute of Physics | en_US |
| dc.subject.department | Department of Mechanical Engineering | |
| dc.title | Ideal magnetocaloric effect for active magnetic regenerators | en_US |