Magnetocaloric heat-pump cycles based on the AF-F transition in Fe-Rh alloys
Abstract
The proposal involves a heat-pumping scheme based upon the first-order antiferromagnetism-ferromagnetism transition in FeRh alloy. Using the model S- T diagram for this alloy, the heat-pump cycles, are drawn up based on the transition latent heat absorption and emission when the transition is induced by applying magnetic field. The calculated values of heat coefficient ϕ for the cycles are ∼39 at Δ T=5 K and ∼30 at Δ T=10 K, where Δ T is the difference between the temperature surrounding and that of the heat receiver. These values are achieved using the comparatively low magnetic fields of ∼2×10 6 A m -1. The high values of ϕ, together with high value of cooling capacity, make it possible to consider Fe-Rh alloys as an effective magnetic heat-pump working body near the room temperature.
- Publication:
-
Journal of Magnetism and Magnetic Materials
- Pub Date:
- October 2002
- DOI:
- 10.1016/S0304-8853(02)00477-8
- Bibcode:
- 2002JMMM..251...61A