Development of a turbine cryocooler for high temperature superconductor applications

H. Hirai, Y. Suzuki, M. Hirokawa, H. Kobayashi, Y. Kamioka, Masataka Iwakuma, Y. Shiohara

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

For high temperature superconductor (HTS) applications such as a power cable, a motor, and a transformer, a refrigerator enough to cool them below liquid nitrogen temperature is required to attain the HTS system stable operation. Since no refrigerator matched for the HTS application both in temperature and in cooling power is available up to now, a neon turbo-Brayton cycle refrigerator of 2 kW at 70 K was developed. Neon gas was used as the working fluid in the refrigerator. Although hydrogen and helium could be selected as a working fluid for the refrigerator, neon is better energy carrier since it has higher heat capacity and larger molecular weight than hydrogen and helium at a temperature around 70 K in order to make a refrigerator smaller in size. Neon has an advantage in using a small turbo-expander with an impeller of 25 mm in diameter. The turbine rotated at a maximum speed of 100,000 rpm. The information for developing a suitable refrigerator for HTS applications was collected and a new type of neon refrigerator was proposed.

Original languageEnglish
Pages (from-to)1857-1861
Number of pages5
JournalPhysica C: Superconductivity and its applications
Volume469
Issue number15-20
DOIs
Publication statusPublished - Oct 15 2009

Fingerprint

High temperature superconductors
Refrigerators
refrigerators
turbines
high temperature superconductors
Neon
Turbines
neon
Helium
working fluids
Hydrogen
helium
Brayton cycle
Fluids
Liquid nitrogen
hydrogen
liquid nitrogen
transformers
Temperature
cables

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

Cite this

Development of a turbine cryocooler for high temperature superconductor applications. / Hirai, H.; Suzuki, Y.; Hirokawa, M.; Kobayashi, H.; Kamioka, Y.; Iwakuma, Masataka; Shiohara, Y.

In: Physica C: Superconductivity and its applications, Vol. 469, No. 15-20, 15.10.2009, p. 1857-1861.

Research output: Contribution to journalArticle

Hirai, H. ; Suzuki, Y. ; Hirokawa, M. ; Kobayashi, H. ; Kamioka, Y. ; Iwakuma, Masataka ; Shiohara, Y. / Development of a turbine cryocooler for high temperature superconductor applications. In: Physica C: Superconductivity and its applications. 2009 ; Vol. 469, No. 15-20. pp. 1857-1861.
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