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 ΔT = 5 K and ∼ 30 at ΔT = 10 K, where ΔT 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 × 106 Am-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. © 2002 Elsevier Science B.V. All rights reserved. © 2017 Elsevier B.V., All rights reserved.