成果報告書詳細
管理番号20120000000193
タイトル*平成22年度中間年報 イットリウム系超電導電力機器技術開発 超電導変圧器技術開発 冷却システム技術開発
公開日2012/4/28
報告書年度2010 - 2010
委託先名大陽日酸株式会社
プロジェクト番号P08016
部署名省エネルギー部
和文要約「和文要約等以下本編抜粋」
1. 研究開発の内容及び成果等
(1)小型膨張タービンの高効率化
平成22 年度の実施計画に従い膨張タービンの性能試験および性能向上のための各種解析を実施した。冷凍機の性能(COP)を左右するタービン効率については、タービンインペラ羽根形状の変更などにより平成21 年度の70%から2 ポイント向上し72%を達成した。また更なる性能向上の手掛かりを得るため、タービンのノズル羽根とインペラの内部流れの動的流体解析(CFD解析)やタービン低温部への侵入熱解析を実施した。今後は解析結果を参考に各種確認試験やタービンの改良改善を行い、更なる性能向上への取り組みを継続する。
英文要約Title: Technological Development of Yttrium-based Superconducting Power Equipment (FY2008-FY2010) FY2010 Annual Report

Brayton cycle Neon refrigerator is being developed and will be installed in a cooling system for High Temperature Superconducting power machines. The refrigerator is required high COP (coefficient of performance) and compactness.
The new turbo-expander performance was checked with thermal conductive analysis of heat in-leak and computed fluid dynamic analysis for nozzle blade and impeller blade. On the basis of the analysis, the blade configuration of the turbine impeller was changed, and the turbine isentropic efficiency was improved up to 72 %.
The new turbo-compressor was assembled and its performance tests on a stand-alone test rig were conducted strictly according to Japanese Industrial Standard (JIS B 8345). Neon gas (actual gas) was used as a working fluid for the performance tests. In the performance tests, we got many data about pressure characteristic, isentropic efficiency and magnetic bearings stability. These data will be utilized for achieving a higher compressor performance. In this stage, it was recognized that the compressor had a compression ratio of 2.0 and isentropic efficiency of 70 %. On the other hand, a compressor motor was heated up to near the maximum operating temperature (about 120 ~C). The motor is a compact high-frequency type and its rated power is 60 kW. The motor is cooled by circulating water. This issue will be solved by improving water cooling performance.
Heat exchanger size reduction is very important for the compactness of the refrigerator. On the other hand, it makes COP degraded and size reduction must be investigated very carefully. The original heat exchanger unit consisted of 5 blocks. In this year, heat exchanger performance tests were conducted for two different blocks of heat exchanger. One was 3 blocks heat exchanger in a unit and the other was 4 blocks heat exchanger in a unit. The test results showed that the 3 blocks heat exchanger had 98.2 % efficiency and the 4 blocks heat exchanger had 98.6 % efficiency. According to the results, even 3 blocks heat exchanger is possible to achieve the our final target (COP 0.06 at 80 K and cooling power 2.0 kW at 65 K)
We assembled a test refrigerator with a compact turbo-expander, a compact turbo-compressor and 4 blocks heat exchanger. Refrigerator performance tests were carried out under the process pressure condition of 1 MPa in the high pressure side and 0.5 MPa in the low pressure side. We got 2.06 kW cooling power at 65 K and 0.059 COP at 80 K. It is assured that our final target will be done on time.
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