Système de refroidissement cryogénique pour transformateurs à supraconducteurs haute température utilisant la convection naturelle d'azote liquide sous-refroidi.
Cryogenic cooling system of HTS transformers by natural convection of subcooled liquid nitrogen.
Auteurs : CHANG H. M., CHOI Y. S., SCIVER S. W. van, et al.
Résumé
Heat transfer analysis on a newly proposed cryogenic cooling system is performed for HTS transformers to be operated at 63-66 K. In the proposed system, HTS pancake windings are immersed in a liquid nitrogen bath where the liquid is cooled simply by colder copper sheets vertically extended from the cold head of a cryocooler. Liquid nitrogen in the gap between the windings and the copper sheets develops a circulating flow by buoyancy force in the subcooled state. The calculation results show that the warm end of the HTS windings can be maintained at only 2-3 K above the freezing temperature of nitrogen, with acceptable values for the height of HTS windings and the thickness of copper sheets. It is concluded that the cooling by natural convection of subcooled liquid nitrogen can be an excellent option for compactness, efficiency, and reliability of HTS transformers.
Détails
- Titre original : Cryogenic cooling system of HTS transformers by natural convection of subcooled liquid nitrogen.
- Identifiant de la fiche : 2005-0039
- Langues : Anglais
- Date d'édition : 10/2003
- Source : Source : Cryogenics/Proc. Korea-Jpn. jt. Workshop 2002 appl. Supercond. Cryog., Seoul
vol. 43; n. 10-11; 589-596; fig.; tabl.; 18 ref.
Indexation
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Cooling characteristics of subcooled liquid nit...
- Auteurs : SHIN P. K., KIM D. L., YANG H. S., et al.
- Date : 17/07/2006
- Langues : Anglais
- Source : Multiconference CryoPrague 2006 (9th Cryogenics 2006, ICEC 21, ICMC'06)
- Formats : PDF
Voir la fiche
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A large scale high-crititical temperature super...
- Auteurs : SHINTOMI K., YAHARA A., IRISAWA D., IMAI K., MATSUBA H.
- Date : 17/07/1996
- Langues : Anglais
- Source : Advances in cryogenic engineering.
Voir la fiche
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Cooling of long superconducting cables with liq...
- Auteurs : HERZOG F., KUTZ T., REISER W.
- Date : 05/10/2021
- Langues : Anglais
- Source : Cryogenics 2021 online. Proceedings of the 16th IIR International Conference, October 5-7, 2021.
- Formats : PDF
Voir la fiche
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Liquid nitrogen cooled sample stage for scannin...
- Auteurs : GERBER R., NISSEL T., WENER H. G., WILLMANN A., HUEBENER R. P., KOELLE D., GROSS R.
- Date : 01/1997
- Langues : Anglais
- Source : Cryogenics - vol. 37 - n. 1
Voir la fiche
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Natural circulation precooling experiment on a ...
- Auteurs : ZHENG X., CHEN G., GAN Z., et al.
- Date : 22/04/2003
- Langues : Anglais
- Source : Cryogenics and refrigeration. Proceedings of ICCR 2003.
Voir la fiche