Sub-cooled Liquid Nitrogen Cryogenic System with Neon Turbo-refrigerator for HTS Power Equipment

被引：16

作者：

Yoshida, S. ^{[1
]}

Hirai, H. ^{[1
]}

Nara, N. ^{[1
]}

Ozaki, S. ^{[1
]}

Hirokawa, M. ^{[1
]}

Eguchi, T.

Hayashi, H. ^{[2
]}

Iwakuma, M. ^{[3
]}

Shiohara, Y. ^{[4
]}

机构：

[1] Taiyo Nippon Sanso Corp, Tsukuba, Ibaraki 3002611, Japan

[2] Kyushu Elect Power Co Inc, Fukuoka 8158520, Japan

[3] Kyushu Univ, Fukuoka 8190395, Japan

[4] ISTEC, Superconduct Res Lab, Tokyo 1350062, Japan

来源：

ADVANCES IN CRYOGENIC ENGINEERING | 2014年 / 1573卷

关键词：

sub-cooled liquid nitrogen; turbo-Brayton refrigerator; High Temperature Superconducting (HTS) equipment;

D O I：

10.1063/1.4860849

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

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.

引用

页码：1246 / 1253

页数：8

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