Neon turbo-brayton cycle refrigerator for hts power machines

H. Hirai, M. Hirokawa, S. Yoshida, N. Nara, S. Ozaki, H. Hayashi, H. Okamoto, Y. Shiohara

Research output: Chapter in Book/Report/Conference proceedingConference contribution

13 Citations (Scopus)


We developed a prototype turbo-Brayton refrigerator whose working fluid is neon gas. The refrigerator is designed for a HTS (High Temperature Superconducting) power transformer and its cooling power is more than 2 kW at 65 K. The refrigerator has a turbo-expander and a turbo-compressor, which utilize magnetic bearings. These rotational machines have no rubbing parts and no oil-components. Those make a long maintenance interval of the refrigerator. The refrigerator is very compact because our newly developed turbo-compressor is volumetrically smaller than a displacement type compressor in same operating specification. Another feature of the refrigerator is a wide range operation capability for various heat-loads. Cooling power is controlled by the input-power of the turbo-compressor instead of the conventional method of using an electric heater. The rotational speed of the compressor motor is adjusted by an inverter. This system is expected to be more efficient. We show design details, specification and cooling test results of the new refrigerator in this paper.

Original languageEnglish
Title of host publicationAdvances in Cryogenic Engineering - Transactions of the Cryogenic Engineering Conference-CEC
Number of pages8
Publication statusPublished - 2012
Externally publishedYes
Event2011 Joint Cryogenic Engineering and International Cryogenic Materials Conferences - Spokane, WA, United States
Duration: Jun 13 2011Jun 17 2011

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


Conference2011 Joint Cryogenic Engineering and International Cryogenic Materials Conferences
Country/TerritoryUnited States
CitySpokane, WA

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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