Overview of Existing Magnetocaloric Prototype Devices - Magnetocaloric Energy Conversion: From Theory to Applications - page 302

Table 7.21 Rotary magnetic prototype from Railway Technical Research Institute
Name and address of institute Railway Technical Research Institute

Name of contact person/email Yoshiki Miyazaki/[e-mail]

Year of production 2011

Type Rotary

Maximum frequency 1.3 Hz

Maximum cooling power 150 W

Maximum temperature span 7.6 K

Type of AMR Packed bed

MC material(s) Gd, La Fe Co Si

- - -

Type of magnets Halbach-arrayed Nd - Fe - B magnet

The device consisted of eight stationary AMR beds and a rotating modi ed Halbach

magnet assembly. The magnet assembly had four 2.4 T magnetic eld areas.

A special feature of the device is the hydraulic connections of the AMR beds. Eight
AMR beds were separated in two parts. Each four beds were hydraulically con-
nected in series. In this manner, ow through all four beds between the

heat exchangers. Furthermore, an important focus was also given to the reduction of
thermal losses related to the hot and cold

fl uid could fl

uid circuits. However, the conclusion
was that the researchers needed to conduct additional analyses of the heat transfer in
regenerators and to study different magnetocaloric materials before the initial tests
of the prototype performance were carried out.

fl