High-efficiency magnetic refrigeration using holmium.

ABSTRACT: Magnetic refrigeration (MR) is a method of cooling matter using a magnetic field. Traditionally, it has been studied for use in refrigeration near room temperature; however, recently MR research has also focused on a target temperature as low as 20 K for hydrogen liquefaction. Most research to date has employed high magnetic fields (at least 5 T) to obtain a large entropy change, which requires a superconducting magnet and, therefore, incurs a large energy cost. Here we propose an alternative highly efficient cooling technique in which small magnetic field changes, Δμ₀H ≤ 0.4 T, can obtain a cooling efficiency of -ΔS_M/Δμ₀H = 32 J kg^-1K^-1T^-1, which is one order of magnitude higher than what has been achieved using typical mag

SUBMITTER: Terada N 

PROVIDER: S-EPMC7896054 | biostudies-literature | 2021 Feb

REPOSITORIES: biostudies-literature