Development of High Capacity Split Stirling Cryocooler for HTS

Sumitomo Heavy Industries, Ltd. (SHI) developed a high-power Stirling-type pulse tube cryocooler for cooling high-temperature superconductor (HTS) devices, such as superconductor motors, superconducting magnetic energy storage (SMES), and fault current limiters. The experimental results of a prototy...

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Bibliographic Details
Published in:Physics procedia 2015, Vol.67, p.462-467
Main Authors: Yumoto, Kenta, Nakano, Kyosuke, Hiratsuka, Yoshikatsu
Format: Article
Language:English
Subjects:
Coefficient of performance
Compressor
High-temperature superconductor
Stirling cryocooler
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Summary:Sumitomo Heavy Industries, Ltd. (SHI) developed a high-power Stirling-type pulse tube cryocooler for cooling high-temperature superconductor (HTS) devices, such as superconductor motors, superconducting magnetic energy storage (SMES), and fault current limiters. The experimental results of a prototype pulse tube cryocooler were reported in September 2013. For a U-type expander, the cooling capacity was 151W at 70K with a compressor input power of 4kW. Correspondingly, the coefficient of performance (COP) was about 0.038. However, the efficiency of the cryocooler is required to be COP > 0.1 and it was found that, theoretically, it is difficult to further improve the efficiency of a pulse tube cryocooler because the workflow generated at the hot end of the pulse tube cannot be recovered. Therefore, it was decided to change the expander to a free-piston type from a pulse tube type. A prototype was developed and preliminary experiments were conducted. A cooling capacity of 120W at 70K with a compressor input power of 2.15kW with corresponding COP of 0.056, was obtained. The detailed results are reported in this paper.
ISSN:1875-3892
1875-3892
DOI:10.1016/j.phpro.2015.06.059