NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
magnetic heat pumping near room temperatureIt is shown that magnetic heat pumping can be made practical at room temperature by using a ferromagnetic material with a Curie point at or near operating temperature and an appropriate regenerative thermodynamic cycle. Measurements are performed which show that gadolinium is a resonable working material and it is found that the application of a 7-T magnetic field to gadolinium at the Curie point (293 K) causes a heat release of 4 kJ/kg under isothermal conditions or a temperature rise of 14 K under adiabatic conditions. A regeneration technique can be used to lift the load of the lattice and electronic heat capacities off the magnetic system in order to span a reasonable temperature difference and to pump as much entropy per cycle as possible
Document ID
19760057110
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Brown, G. V.
(NASA Lewis Research Center Cleveland, Ohio, United States)
Date Acquired
August 8, 2013
Publication Date
August 1, 1976
Publication Information
Publication: Journal of Applied Physics
Volume: 47
Subject Category
THERMODYNAMICS AND STATISTICAL PHYSICS
Distribution Limits
Public
Copyright
Other