Environmental Engineering Reference
In-Depth Information
Table 4.5
Fluid
ow and (de)magnetization periods for the analysed thermodynamic cycles
Time periods/Magnetic eld
Type and characteristics of the process
fl
Magnetic
eld
distribution
Brayton
Adiabatic magnetization
Iso
eld cooling of MCM
Adiabatic
demagnetization
Iso
eld heating of MCM
(
˄
1
−
˄
0
)(v
f
=0)
(
˄
2
−
˄
1
)=4(
˄
1
−
˄
0
)
(
˄
3
−
˄
2
)(v
f
=0)
(
˄
4
−
˄
3
)=4(
˄
3
−
˄
2
)
(v
f
>0)
(v
f
<0)
Ericsson
Isothermal magnetization
Iso
eld cooling of MCM
Isothermal
demagnetization
Iso
eld cooling of MCM
(
˄
1
−
˄
0
)(v
f
>0)
(
˄
2
−
˄
1
)=4(
˄
1
−
˄
0
)
(
˄
3
−
˄
2
)(v
f
<0)
(
˄
4
−
˄
3
)=4(
˄
3
−
˄
2
)
(v
f
>0)
(v
f
<0)
Carnot
Adiabatic magnetization
Isothermal
magnetization
Adiabatic
demagnetization
Isothermal
demagnetization
(
˄
1
−
˄
0
) H
1
= H
max
/2
(v
f
=0)
(
˄
2
−
˄
1
) H
2
= H
max
(v
f
>0)
(
˄
3
−
˄
2
) H
3
= H
max
/2
(v
f
=0)
(
˄
4
−
˄
3
) H
4
= H
0
=0
(v
f
<0)
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