Overview of Existing Magnetocaloric Prototype Devices - Magnetocaloric Energy Conversion: From Theory to Applications - page 296

Table 7.15 Prototype built by George Washington University and the National Institute of
Standards and Technology (Farhad Shir next to the device)
Name and address of institute The George Washington University

Name of contact person/email Farhad Shir/[e-mail]

Year of production 2004

Type Rotary

Maximum frequency N/A

Maximum cooling power N/A

Maximum temperature span 5 K

Type of AMR Packed bed

MC material(s) Gadolinium

Type of magnets “ Magic ring ” magnet

lled with four different Gd-based materials. These were
Gd 0.91 Y 0.09 ,Gd 0.84 Dy 0.16 ,Gd 0.87 Dy 0.13 and Gd 0.89 Dy 0.11 spheres with a diameter of
0.6 mm. The total mass of all four AMRs was 1,000 g. The heat-transfer fluid was
water. All the performance tests were carried out at an operating frequency of 3.33 Hz.
Tests with four different hot-side temperatures were conducted (278, 283, 288, 293 K).
At the hot-side temperature of 278 K the speci

The AMR beds were

c cooling powers of 10 and 50 W kg − 1
were achieved at temperature spans of 4 and 0.5 K, respectively. When the hot-side