JAXA Repository / AIREX 未来へ続く、宙(そら)への英知

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Other TitleIntegrated ground test Water-Energy-Cycle Space Propulsion System
Author(jpn)橋本 保成; 田中 孝治; 石井 忠司; 藤田 孝; 都木 恭一郎
Author(eng)Hashimoto, Yasunari; Tanaka, Koji; Ishii, Tadashi; Fujita, Takashi; Toki, Kyoichiro
Author Affiliation(jpn)宇宙航空研究開発機構 宇宙科学研究本部; 宇宙航空研究開発機構 宇宙科学研究本部; 次世代技術; AEC藤田; 東京農工大学
Author Affiliation(eng)Japan Aerospace Exploration Agency (JAXA) Institute of Space and Astronautical Science (ISAS); Japan Aerospace Exploration Agency (JAXA) Institute of Space and Astronautical Science (ISAS); Jisedaitech L. P.; AEC Fujita; Tokyo University of Agriculture and Technology
Issue Date2008-05
PublisherInstitute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA/ISAS)
Publication title第27回宇宙エネルギーシンポジウム 平成19年度
The Twenty-seventh Space Energy Symposium
Start page112
End page116
Publication date2008-05
AbstractA space propulsion and a power generation system using Water-Energy-Cycle are integrated as a 'Water-Energy-Cycle Space Propulsion System' into a standard rack compatible to the Space Station 'Kibo' cabin. This newly conceptualized system stores hydrogen and oxygen electrolyzed from water by solar cell energy during sunshine period, while in the reverse cycle, these gases are provided into fuel cells to generate electrical power and water during sunshade period. The stored hydrogen and oxygen are also usable as rocket propellants, and furthermore, the water and oxygen are available for the life support system just in case of the emergency during manned space activities for example, the lunar base. This time we constructed a 20-cell fuel-cell stack, a 20-cell electrolyzing stack, each dehumidifier for H2 and O2 gases, and an overall control/monitor system using LabVIEW-8. The basic examination for the fuel-cell stack was performed to obtain the V-I curve and other transient data. It was verified that the fuel-cell stack can generate 100 W at the nominal operation point with a variety of gas flow rates. We also recognized that a purge line should be added to the fuel-cell stack in order to maintain the maximum generating power constant. On the other hand, the water electrolyzing stack revealed high performance up to 200-250 W input power. This result was almost identical to the predicted performance from the former testing of a single-cell. However, the high pressure H2 and O2 storage up to 2 atg was suffered from leakage between the cells. The stack must be very carefully constructed. The humidification from the electrolyzed gases was successful operated using a stirling cooler and the dew point of lower than 0 C was easily realized. Now there are only a few of the integrated ground tests are remaining, such as the operations at different G directions to simulate non-gravity environment and a combustion test using a newly designed diffuser.
KeywordsJapanese Experiment Module; water energy cycle; space propulsion system; manned orbital laboratory; water; electrolysis; hydrogen; oxygen; hydrogen oxygen fuel cell; spacecraft power supply; propellant tank; solar generator; きぼう; 水エネルギーサイクル; 宇宙推進システム; 有人軌道実験室; 水; 電解; 水素; 酸素; 水素-酸素燃料電池; 宇宙機給電; 推進薬タンク; 太陽光発電機
Document TypeConference Paper
JAXA Categoryシンポジウム・研究会

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