Speaker
Mr
Yumoto Kenta
(Sumitomo Heavy Industries, Ltd.,)
Description
Abstract. Sumitomo Heavy Industries, Ltd. (SHI) developed a high power stirling type pulse tube cryocooler for the purpose of cooling high-temperature superconductor (HTS) devices, such as superconductor motor, SMES and current fault limiter. The experimental results of a prototype pulse tube cryocooler were reported in September 2014. For a U type expander, the cooling capacity was 151 W at 70 K with a compressor input power of 4 kW. Accordingly, COP was about 0.038. However, the efficiency of the cryocooler is required to be COP > 0.1 and it is found that, theoretically, it is difficult to further improve the efficiency of a pulse tube cryocooler because the work-flow generated from the hot-end of the pulse tube cannot be recovered. Therefore, it is decided to change the expander to a free-piston type from a pulse tube type. A prototype has been developed and preliminary experiments have been performed, as the results, the cooling capacity was 120 W at 70 K with a compressor input power of 2.15 kW, COP was about 0.056.The detailed results are reported in this paper.
Author
Mr
Yumoto Kenta
(Sumitomo Heavy Industries, Ltd.,)
Co-authors
Dr
hiratsuka yoshikatsu
(Sumitomo Heavy Industries, Ltd.,)
Mr
nakano kyosuke
(Sumitomo Heavy Industries, Ltd.,)
