Liquid Hydrogen Recirculation System for Forced Flow Cooling Test of Superconducting Conductors

Cryogenic Engineering Conference 2017

材料科学;物理学

Shirai, Y.^1 ; Kainuma, T.^1 ; Shigeta, H.^1 ; Shiotsu, M.^1 ; Tatsumoto, H.^2 ; Naruo, Y.^3 ; Kobayashi, H.^3 ; Nonaka, S.^3 ; Inatani, Y.^3 ; Yoshinaga, S.^4

Graduate School of Energy Science, Kyoto University, Kyoto, Japan^1

Facility for Rare Isotope Beams, Michigan State University, MI, United States^2

JAXA, Kanagawa, Sagamihara, Japan^3

IHI, Kanagawa, Yokohama, Japan^4

关键词: External magnetic field;    Heat transfer characteristics;    High critical temperature;    Liquid hydrogen tanks;    Maximum flow rate;    Performance tests;    Recirculation systems;    Superconducting conductors;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/278/1/012036/pdf
DOI  :  10.1088/1757-899X/278/1/012036

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The knowledge of forced flow heat transfer characteristics of liquid hydrogen (LH2) is important and necessary for design and cooling analysis of high critical temperature superconducting devices. However, there are few test facilities available for LH2forced flow cooling for superconductors. A test system to provide a LH2forced flow (∼10 m/s) of a short period (less than 100 s) has been developed. The test system was composed of two LH2tanks connected by a transfer line with a controllable valve, in which the forced flow rate and its period were limited by the storage capacity of tanks. In this paper, a liquid hydrogen recirculation system, which was designed and fabricated in order to study characteristics of superconducting cables in a stable forced flow of liquid hydrogen for longer period, was described. This LH2loop system consists of a centrifugal pump with dynamic gas bearings, a heat exchanger which is immersed in a liquid hydrogen tank, and a buffer tank where a test section (superconducting wires or cables) is set. The buffer tank has LHe cooled superconducting magnet which can produce an external magnetic field (up to 7T) at the test section. A performance test was conducted. The maximum flow rate was 43.7 g/s. The lowest temperature was 22.5 K. It was confirmed that the liquid hydrogen can stably circulate for 7 hours.