Sub-cooled liquid nitrogen cryogenic system with neon turbo-refrigerator for HTS power equipment

S. Yoshida, H. Hirai, N. Nara, S. Ozaki, M. Hirokawa, T. Eguchi, H. Hayashi, M. Iwakuma, Y. Shiohara

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

9 Citations (Scopus)

Abstract

We developed a prototype sub-cooled liquid nitrogen (LN) circulation system for HTS power equipment. The system consists of a neon turbo-Brayton refrigerator with a LN sub-cooler and LN circulation pump unit. The neon refrigerator has more than 2 kW cooling power at 65 K. The LN sub-cooler is a plate-fin type heat exchanger and is installed in a refrigerator cold box. In order to carry out the system performance tests, a dummy cryostat having an electric heater was set instead of a HTS power equipment. Sub-cooled LN is delivered into the sub-cooler by the LN circulation pump and cooled within it. After the sub-cooler, sub-cooled LN goes out from the cold box to the dummy cryostat, and comes back to the pump unit. The system can control an outlet sub-cooled LN temperature by adjusting refrigerator cooling power. The refrigerator cooling power is automatically controlled by the turbo-compressor rotational speed. In the performance tests, we increased an electric heater power from 200 W to 1300 W abruptly. We confirmed the temperature fluctuation was about ±1 K. We show the cryogenic system details and performance test results in this paper.

Original languageEnglish
Title of host publicationAdvances in Cryogenic Engineering - Transactions of the Cryogenic Engineering Conference - CEC, Volume 59
EditorsSusan Breon, Jennifer Marquardt, Thomas Peterson, Michael DiPirro, John Pfotenhauer, Jonathan Demko, James Fesmire, Arkadiy Klebaner, Sidney Yuan, Al Zeller, Peter Kittel, Gregory Nellis, Mark Zagarola
PublisherAmerican Institute of Physics Inc.
Pages1246-1253
Number of pages8
ISBN (Electronic)9780735412019
DOIs
Publication statusPublished - Jan 1 2014
Event2013 Joint Cryogenic Engineering and International Cryogenic Materials Conferences, CEC/ICMC 2013 - Anchorage, United States
Duration: Jun 17 2013Jun 21 2013

Publication series

NameAIP Conference Proceedings
Volume1573
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference2013 Joint Cryogenic Engineering and International Cryogenic Materials Conferences, CEC/ICMC 2013
CountryUnited States
CityAnchorage
Period6/17/136/21/13

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Yoshida, S., Hirai, H., Nara, N., Ozaki, S., Hirokawa, M., Eguchi, T., Hayashi, H., Iwakuma, M., & Shiohara, Y. (2014). Sub-cooled liquid nitrogen cryogenic system with neon turbo-refrigerator for HTS power equipment. In S. Breon, J. Marquardt, T. Peterson, M. DiPirro, J. Pfotenhauer, J. Demko, J. Fesmire, A. Klebaner, S. Yuan, A. Zeller, P. Kittel, G. Nellis, & M. Zagarola (Eds.), Advances in Cryogenic Engineering - Transactions of the Cryogenic Engineering Conference - CEC, Volume 59 (pp. 1246-1253). (AIP Conference Proceedings; Vol. 1573). American Institute of Physics Inc.. https://doi.org/10.1063/1.4860849