Thermal Packaging of High Temperature Superconductor Bulk for Superconducting Flywheel Energy Storage

This paper describes thermal packaging issues of YBCO high-temperature superconductor (HTS) bulk for SFES (superconducting flywheel energy storage) system. For stable operation of the superconducting bearing, the temperature of HTS bulk needs to be maintained below 70 K by a cryocooler system where...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2013-06, Vol.23 (3), p.5701104-5701104
Main Authors: Ki, Taekyung, Jeong, Sangkwon, Han, Young Hee, Park, Byung Jun
Format: Article
Language:English
Subjects:
AGING MECHANISMS
Applied sciences
COATING
COPPER OXIDE
Deposition
Design. Technologies. Operation analysis. Testing
Direct energy conversion and energy accumulation
Electrical engineering. Electrical power engineering
Electrical power engineering
Electronics
ELEVATED TEMPERATURE
Energy accumulation
Exact sciences and technology
Flywheels
HEAT TRANSFER
Heating
High temperature superconductors
high-temperature superconductor (HTS)
Integrated circuits
Miscellaneous
PACKAGING
radiation heat loss
Rough surfaces
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Silver
SUPERCONDUCTIVITY
SUPERCONDUCTORS
Surface roughness
Surface treatment
THERMAL CONDUCTIVITY
thermal energy storage
Various equipment and components
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Summary:This paper describes thermal packaging issues of YBCO high-temperature superconductor (HTS) bulk for SFES (superconducting flywheel energy storage) system. For stable operation of the superconducting bearing, the temperature of HTS bulk needs to be maintained below 70 K by a cryocooler system where thermal radiation from room temperature environment is a dominant heat load. The thermal radiation heat flux must be reduced to avoid temperature nonuniformity inside HTS bulk and fully utilize the limited cooling capacity of the cryocooler. This paper investigates the various silver coating methods for HTS bulk of SFES. The effective silver coating and postprocessing methods of HTS bulk surface diminish the radiation heat load substantially, which enables a much smaller cryocooler to be equipped for SFES than before. Additionally, a change of thermal conductivity and thermal contact conductance of HTS bulk is investigated according to the various silver coating methods.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2013.2241376