Design and construction of a static magnetic refrigerator operatingbetween 1.8 K and 4.5 K
| Autor: | Ph. Lebrun, M. Schmidt-Ricker, A. Bézaguet, M. Marquet, R. Losserand-Madoux, J. Casas-Cubillos, P. Seyfert |
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| Rok vydání: | 1994 |
| Předmět: |
Thermal efficiency
Materials science Liquid helium Nuclear engineering General Physics and Astronomy Thermodynamics Refrigeration Superconducting magnet Cryogenics Accelerators and Storage Rings law.invention symbols.namesake law Thermodynamic cycle Magnetic refrigeration symbols General Materials Science Carnot cycle |
| Zdroj: | Cryogenics. 34:227-230 |
| ISSN: | 0011-2275 |
| Popis: | Following pioneer work a decade ago at CEA/CEN-Grenoble, France we have designed and constructed a static magnetic refrigerator with a capacity of about 20 W, operating on a quasi-Carnot cycle between 1.8 and 4.5 K. The active core, which contains 10.1 kg of single-crystal gadolinium-gallium garnet (GGG), is magnetized and demagnetized by a 3.5 T pulsed-field, low-loss superconducting magnet operating at 4.5 K. Thermal switching to the cold and warm sources is produced by alternatively flushing the core with liquid helium from the 1.8 and 4.5 K baths, by means of alumina-piston and -cylinder displacer pumps. Precise modelling of thermodynamic properties of GGG, as well as detailed analysis of the different sources of irreversibility, allow to estimate the available refrigeration power and optimize the operating cycle. |
| Databáze: | OpenAIRE |
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