Magnetic heat pumping near room temperature

Journal Article · Sun Aug 01 04:00:00 EDT 1976 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.323176· OSTI ID:7345665

Brown, G V

Magnetic heat pumping can be made practical at room temperature by using a ferromagnetic material with a Curie point in or near the operating temperature range and an appropriate regenerative thermodynamic cycle. Rare earths are found to be much more effective in this application than transition elements, and measurements have been made which show that gadolinium (Curie point: 293 degreeK) is a reasonable working material. The application of a 7-T magnetic field to Gd at the Curie point causes a heat release of 4 kJ/kg under isothermal conditions or a temperature rise of 14 degreeK under adiabatic conditions. A regeneration technique is proposed which removes the limits usually expected on the temperature span of a magnetic cycle. The cycle efficiency can approach the Carnot-cycle efficiency. (AIP)

• Research Organization: National Aeronautics and Space Administration, Lewis Research Center, Cleveland, Ohio 44135
• OSTI ID: 7345665
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 47:7; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
COOLING
CURIE POINT
EFFICIENCY
ELEMENTS
ENERGY TRANSFER
ENTROPY
FERROMAGNETIC MATERIALS
GADOLINIUM
HEAT TRANSFER
HEATING
HIGH-FREQUENCY HEATING
MAGNETIC MATERIALS
MAGNETIC-PUMPING HEATING
MAGNETIZATION
MATERIALS
METALS
PHYSICAL PROPERTIES
PLASMA HEATING
RARE EARTHS
REFRIGERATION
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE