Environmental Engineering Reference
In-Depth Information
rst rotary
magnetic refrigerator at the IIR Thermag 2 conference on magnetic refrigeration in
Portoro
In 2007, the team from the University of Ljubljana presented their
; however, no publication was made at that time. Later, in 2010, the char-
acteristics of the prototype were reported by Tu
ž
ek et al. [
41
], showing and describing
the details of the device. In Fig.
3.31
, the magnet assembly of the device is shown; this
was originally designed by Alen
š
arlah. The magnet assembly consisted of the inner
static soft iron part and two separate outer static parts of soft iron, to which two pairs
of Nd
Š
ux density of 0.98 T was produced
in the air gap for the rotating cylinder, which contained parallel Gd plates.
Fe
B magnets were attached. A magnetic
fl
-
-
3.4.2 Static Halbach (2D) Magnet Assemblies
The Halbach principle has been applied in many different magnetic refrigerator
prototypes. In some cases the magnet assembly consisted of magnets only, whereas
in other cases, a soft iron was additionally applied to guide the magnetic
ux.
A static magnet assembly, such is that shown in Fig.
3.28
, was applied by many
groups (see the chapter on prototypes for more details).
Combinations also exist, for instance, a hybrid between the Halbach structure and
the horseshoe magnet, which was constructed by Lee et al. (presented in [
42
]
—
see
Fig.
3.32
). The magnitude of the calculated magnetic
fl
fl
ux density of this magnet
assembly was 1.9 T. Through the magnetic
eld, a disc containing AMRs was
rotating.
In 2006, Vasile and Muller [
43
] presented a paper in which a Halbach structure,
embodied with the soft iron, was shown. Such a principle enables better shielding
of the magnetic
fl
ux than the previous case. However, in both cases the magnetic
Fig. 3.32 a An example of a static magnet assembly developed by Lee et al. [
42
], b an example of
a part of the magnet assembly developed by Vasile and Muller [
43
]
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