HEAT PUMPING SCHEME BASED ON INDUCEMENT OF THE F-AF TRANSITION IN FeRh BY PRESSURE

摘要

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 the transition latent heat acquisition and emission when the transition is induced isothermally. Corresponding coefficient of performance (COP) 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)·10~9 Pa the COP of the heat-pump cycles takes the values from 30 to 35. These values are comparable to those found recently with using the tensile stress up to ψ = 1·10~9 Pa and with using the magnetic field up to H = 2·10~6 A/m.