An optimized magnet for magnetic refrigeration

TL;DR

This paper presents an optimized magnet design for magnetic refrigeration, achieving high flux density and efficiency with minimal magnet volume, representing a significant advancement in magnet design for this application.

Contribution

The paper introduces a novel optimized magnet design for magnetic refrigeration, combining design schemes and segmentation to enhance performance and efficiency.

Findings

Peak flux density of 1.24 T achieved

Average flux density of 0.9 T in 2 L volume

Magnet volume of only 7.3 L

Abstract

A magnet designed for use in a magnetic refrigeration device is presented. The magnet is designed by applying two general schemes for improving a magnet design to a concentric Halbach cylinder magnet design and dimensioning and segmenting this design in an optimum way followed by the construction of the actual magnet. The final design generates a peak value of 1.24 T, an average flux density of 0.9 T in a volume of 2 L using only 7.3 L of magnet, and has an average low flux density of 0.08 T also in a 2 L volume. The working point of all the permanent magnet blocks in the design is very close to the maximum energy density. The final design is characterized in terms of a performance parameter, and it is shown that it is one of the best performing magnet designs published for magnetic refrigeration.