Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The lifetime cost of a magnetic refrigerator   The total cost of a 25 W average load magnetic refrigerator using commercial
grade Gd is calculated using a numerical model. The price of magnetocaloric
material, magnet material and cost of operation are considered, and all
influence the total cost. The lowest combined total cost with a device lifetime
of 15 years is found to be in the range \$150-\$400 depending on the price of
the magnetocaloric and magnet material. The cost of the magnet is largest,
followed closely by the cost of operation, while the cost of the magnetocaloric
material is almost negligible. For the lowest cost device, the optimal magnetic
field is about 1.4 T, the particle size is 0.23 mm, the length of the
regenerator is 40-50 mm and the utilization is about 0.2, for all device
lifetimes and material and magnet prices, while the operating frequency vary as
function of device lifetime. The considered performance characteristics are
based on the performance of a conventional A$^{+++}$ refrigeration unit. In a
rough life time cost comparison between the magnetic refrigeration device and
such a unit we find similar costs, the former being slightly cheaper, assuming
the cost of the magnet can be recuperated at end of life.

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The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
1
The categories of this paper are: cs