Overview of Existing Magnetocaloric Prototype Devices - Magnetocaloric Energy Conversion: From Theory to Applications - page 311

Table 7.30 Third and fourth Chinese rotary magnetic prototypes from Baotou Research Institute
of Rare Earths
Name and address of institute Baotou Research Institute of Rare Earths. Add: No.36,

Huanghe Street, RE High-tech Zone, Baotou,
Inner Mongolia, P.R. China, 014030

Name of contact person/email Jiaohong Huang/[e-mail]

Year of production 2006 - 2010

Type Rotary

Maximum frequency 0.5 Hz

Maximum cooling power 50 W

Maximum temperature span 18 K

Type of AMR Packed bed

MC material(s) Gd spheres, 0.4 0.6 mm, 1,440 g

-

2 × Permanent Nd − Fe − B, 1.25 T Type of magnets

The third and the upgraded fourth rotary prototypes from Baotou Research
Institute of Rare Earths (Table 7.31 ) were built in 2009 and 2012. The magnet
assembly was a concentric Halbach cylinder, where the inner cylinder rotated and
could induce a magnetic eld of 1.4 T. The stationary AMR consisted of Gd and
Gd

0.5 mm in diameter. The total mass of all spheres was 1,500 g.
When the device operated at the frequency of 0.2 Hz the highest no-load temperature
span was 20 K, while the highest speci

Tb spheres of 0.3

- -

c cooling power was 40 W kg − 1 .

7.2.8 Brazilian Prototypes

The Brazilian rotary magnetic prototype was built in collaboration of The Institute
of Physics , Federal University of Sao Paolo and the National

Institute of Metrology and presented in 2009 by Coelho et al. [ 60 ].
The device consisted of a rotating AMR wheel and an electromagnet that could
induce a 2.3 T of magnetic

“ Gleb Wataghin ”

eld. The heat-transfer fl uid was ethyl alcohol. Each

AMR sector was lled with Gd, with the total mass of all six sectors being 960 g.