Heat Pumping Scheme Based on Inducement of the F-AF Transition in FeRh by Pressure

Abstract

On the base of the model S–T projection of S–T–P surface for FeRh alloy one of the possible of the heat pump cycles type is drawn up: with acquisition by the alloy the heat from external heat source. Corresponding efficiency of these cycle as functions of temperature at various differences between initial and final temperatures (permanent thermal load ΔT) and as a function of pressure at various differences between initial and final temperatures are analyzed. It is found, particularly, that within the temperature range (320 – 370) K and pressure range (0.4 – 1.0)∙109 Pa efficiency of the heat-pump cycles takes the values from the interval from 30 to 35. These values are comparable to those found recently with using the tensile stress up to ψ = 1∙109 Pa and with using the magnetic field up to H = 2∙106 A/m.