Environmental Engineering Reference
In-Depth Information
7.1.8 Italian Prototypes
Researchers from the University of Genova, Italy, presented their reciprocating
magnetocaloric device in 2009 in the article of Taglia
co et al. [
34
]. They designed
a system with two AMRs which moved alternately in and out of the 1.5 T magnetic
B magnet assembly. The operating frequency was rather
low, i.e. below 0.2 Hz. The two AMRs consisted of Gd powder with an average
diameter of the powder particles equal to 0.3 mm. The heat-transfer fluid was a
mixture of water and anti-freeze. Unfortunately, no information regarding the
performance of this device was given. In 2013, a new prototype was built based on
the experience gained from the
eld provided by a Nd
Fe
-
-
rst one. This was presented in the article by
Taglia
co et al. [
35
]. The magnet assembly in this device was a Nd
Fe
B magnet
-
-
assembly with a 1.55 T magnetic
eld. Also in this case, two AMRs were designed
to move alternately in and out of the magnet assembly. Both AMRs were
lled with
Gd plates. The thickness of plates was 0.8 mm and the total mass of both of the
AMRs was 388 g. The heat-transfer
uid was a mixture of 50 % water and 50 %
ethanol. The device performed a 5 K temperature span under no-load conditions.
fl
7.1.9 Swiss Prototypes
The University of Applied Sciences of Western Switzerland designed and built an
experimental magnetocaloric device (Table
7.9
) that was presented in the article of
Balli et al. [
36
] in 2012. A Nd
-
Fe
-
B Halbach magnet assembly was used with a
magnetic
eld of 1.45 T. Two AMRs were alternately entering and exiting the
magnetic
lled with Gd plates having a thickness of 1 mm.
The total mass of AMRs was 400 g. The heat-transfer
eld. These AMRs were
uid was a silicon oil. The
highest no-load temperature span was 22 K. Researchers also reported that after
certain improvements were made to the device, a no-load temperature span above
30 K had been reached [
36
,
37
].
fl
7.1.10 Korean Prototypes
In 2009 two researchers, Kim and Jeong [
38
], from Korea Advanced Institute of
Science and Technology presented their reciprocating experimental magnetocaloric
device. The AMR, which consisted of Gd particles with a size between 0.325 and
0.5 mm, was moving alternately through a magnetic
eld of 1.58 T, provided with a
static Nd
B Halbach magnet assembly. The maximum frequency of operation
was 1 Hz. The heat-transfer
Fe
-
-
fl
uid was helium. The largest no-load temperature span
obtained was 16 K.
Search WWH ::
Custom Search