New design of neon refrigerator for HTS power machines

S. Yoshida, H. Hirai, A. Takaike, M. Hirokawa, Y. Aizawa, Y. Kamioka, H. Okamoto, H. Hayashi, Y. Shiohara

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

11 Citations (Scopus)


In 2007, we developed a prototype refrigerator with a small turbo-expander to provide adequate cooling power (2 kW at 70 K) for HTS (High Temperature Superconductor) power machines. The reverse-Brayton cycle with neon gas as a working fluid was adopted in the refrigerator. The prototype refrigerator does not have enough COP (Coefficient of Performance) for practical HTS applications, and the purpose of this study is to research the information required for designing a new neon refrigerator with improved performance. We take the same refrigeration cycle and working fluid as the prototype one adopted, but a lower process pressure of 1 MPa/0.5 MPa is chosen instead of 2 MPa/1 MPa. The lower process pressure is required by the turbo-compressor design and the refrigeration process is analyzed by using a newly developed process simulator. Also, a heat-exchanger configuration is studied to make the refrigerator size small. The new refrigerator will have a cooling power of 2.5 kW at 65 K, and a COP of 0.06 at 80 K.

Original languageEnglish
Title of host publicationAdvances in Cryogenic Engineering - Transactions of the Cryogenic Engineering Conference-CEC
Number of pages8
Publication statusPublished - 2010
Externally publishedYes
Event2009 Joint Cryogenic Engineering and International Cryogenic Materials Conferences - Tucson, AZ, United States
Duration: Jun 28 2009Jul 2 2009

Publication series

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


Conference2009 Joint Cryogenic Engineering and International Cryogenic Materials Conferences
Country/TerritoryUnited States
CityTucson, AZ

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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