Exergoeconomic analysis of potential magnet configurations of a magnetic refrigerator operating at 4.2 K

This article compares the exergetic cost of cooling of an Adiabatic Demagnetization Refrigerator (ADR) providing 1 W of refrigeration at 4.2 K, with two different magnetic field sources: a Nb 3 Sn superconducting (SC) magnet and a NdFeB permanent magnet (PM) Halbach cylinder. The total cost of the s...

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Bibliographic Details
Published in:Journal of instrumentation 2022-10, Vol.17 (10), p.C10019
Main Authors: López de Toledo, C.H., López, J.M., Rodriguez, L.G.-T.
Format: Article
Language:English
Subjects:
Adiabatic demagnetization cooling
Cryogenics
Cryogenics and thermal models
Exergy
Magnetic fields
Magnetic materials
Magnetism
Permanent magnets
Refrigerators
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Summary:This article compares the exergetic cost of cooling of an Adiabatic Demagnetization Refrigerator (ADR) providing 1 W of refrigeration at 4.2 K, with two different magnetic field sources: a Nb 3 Sn superconducting (SC) magnet and a NdFeB permanent magnet (PM) Halbach cylinder. The total cost of the system is assumed to be comprised of two components: the cost of the magnetocaloric material (MCM), which is a function of the total volume of the MCM, and the cost of the magnetic system, which depends on the MCM volume and the peak magnetic field. The exergetic cost of cooling for different values of mass (volume) of MCM and hot source temperatures are shown in the article, assuming a specific cost of the SC wire of 890$/kg, 3500$/kg for the MCM, and 100$/kg for the PM. The SC appear to be the most cost-effective solution for the system. However, if large temperatures spans are required between the hot source and the cold source PMs emerge as a better option.
ISSN:1748-0221
1748-0221
DOI:10.1088/1748-0221/17/10/C10019