Theory of an active magnetic regenerative refrigerator
The adiabatic temperature change with field is limited to about 2 K/Tesla for ferromagnets near their Curie temperatures by the change of magnetization with temperature and the lattice heat capacity. Hence, practical magnetic refrigerators operate on a regenerative cycle such as the Brayton cycle. One way to execute this cycle is through the use of an active magnetic regenerator, i.e. a regenerator composed of magnetic material that is cycled in an out of a magnetic field with appropriate fluid flows. The theory of these devices can be predicted by solving the partial differential equations that describe fluid and the magnetic solid. The active magnetic regenerator is described along with the method of calculation. Temperature profiles for a normal regenerator and a magnetic regenerative refrigerator are shown.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 6224820
- Report Number(s):
- LA-UR-83-1251; CONF-821237-1; ON: DE83011184
- Resource Relation:
- Conference: 2. biennial conference on refrigeration for cryogenic sensors and electronic systems, Greenbelt, MD, USA, 7 Dec 1982
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
MAGNETIC REFRIGERATORS
REGENERATORS
CURIE POINT
ENTROPY
FERROMAGNETIC MATERIALS
PARTIAL DIFFERENTIAL EQUATIONS
TEMPERATURE DISTRIBUTION
DIFFERENTIAL EQUATIONS
EQUATIONS
MAGNETIC MATERIALS
MATERIALS
PHYSICAL PROPERTIES
REFRIGERATORS
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
420201* - Engineering- Cryogenic Equipment & Devices