Browsing by Author "Yamazaki, Chiaki"

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Development of CO2 Removal System for the Gateway International Habitation Module
(2024 International Conference on Environmnetal Systems, 2024-07-21) Saijo, Masaru; Hayakawa, Akinobu; Yamazaki, Chiaki; Hirai, Kentaroh; Kinoshita, Tomohiro; Yoshino, Naomi; Yogo, Katsunori
The Japan Aerospace Exploration Agency (JAXA) has been developing the Carbon Dioxide Removal System (CDRS) for the Lunar Gateway International Habitation module (I-HAB). CDRS provides the essential function of removing CO2 that could harm the crew's health in the closed cabin. It is an amine-based regenerative system that absorbs CO2 and vents it to space under a preliminary design phase. This report presents the current status of design and development including parametric studies on the CO2 removal rate using a CDRS breadboard model and following cabin CO2 analysis to achieve a preliminary design solution.
Development Status of Oxygen Generation System and Sabatier System for future exploration missions
(50th International Conference on Environmental Systems, 7/12/2021) Yamazaki, Chiaki; Futamura, Shotaro; Toshiharu, Oka; Matsumoto, Satoshi; Shima, Asuka; Sakurai, Masato; Nakanoya, Sogo
JAXA has been working on the conceptual study of an Oxygen Generation System and Sabatier System for future space missions. The Oxygen Generation System employs a cathode- feed system that utilizes a special JAXA-developed membrane. The study confirmed that the system could provide a stable source of oxygen for two to six crew members. The Sabatier System has a CO2 conversion efficiency of 95.2% at a flow rate of 6.32 NL/min of H2 and 1.58 NL/min of CO2; the system uses a nickel-zirconia catalyst. This paper also reports the reaction efficiencies under different gas flow rates and mixing ratios of CO2 and H2, as well as the improvement of the Sabatier reactor.
FY2024 Development Status of DRCS: ISS Demonstration of JAXA’s CO2 Removal System
(2024 International Conference on Environmnetal Systems, 2024-07-21) Yamazaki, Chiaki; Hirai, Kentaro; Futamura, Shotaro; Shido, Yohei; Matsumoto, Satoshi; Otsuka, Koji; Saruwatari, Hideki; Nakagami, Hidetoshi; Nagase, Mutsumu; Kinoshita, Tomohiro; Yoshino, Naomi; Yogo, Katsunori
The Japan Aerospace Exploration Agency (JAXA) is developing a CO2 removal system to strengthen core life-support technologies for future crewed space missions. The ISS demonstrator of the CO2 removal system (DRCS) is being developed as one of the activities demonstrating Gateway's CO2 removal system (CDRS) and is scheduled to be launched in FY2024. This paper describes the features of the DRCS, the results of the performance tests of the DRCS Proto Flight Model, and the progress of the validation tests.
JAXA CO2 removal system ISS demonstration (DRCS) development status
(51st International Conference on Environmental Systems, 7/10/2022) Hirai, Kentaro; Sakai, Yoko; Yamazaki, Chiaki; Futamura, Shotaro; Yada, Hironori; Matsumoto, Satoshi; Saruwatari, Hideki
The Japan Aerospace Exploration Agency (JAXA) has been developing a highly reliable air revitalization system with less resupply for future manned space missions. This paper describes current and planned development status focusing on CO2 removal system for ISS demonstration. JAXA considers to have ISS demonstration of CO2 removal system for 1-crew scale. Ground tests and evaluation of new CO2 adsorbent canister, the lifetime and off-gas characteristics of the developed amine-based adsorbents, design overview of flight model are reported.
Overview of JAXA Pressurized Rover development and ECLSS Design
(2024 International Conference on Environmnetal Systems, 2024-07-21) Yamazaki, Chiaki; Ikeda, Naofumi; Kamiyoshi, Seiji; Wada, Masaru; Menjo, Rieko; Matsumoto, Hiroki; Takeda, Junya; Kimura, Norio; Ushioda, Yosuke; Morinaka, Masaki; Komura, Toshiyuki; Matsuda, Kenji; Ohmura, Yukito
The pressurized rover is an exploration system that enables crewed, large-scale exploration of the lunar surface. The system must operate in the harsh lunar environment of 1/6 gravity, regolith dust, a high vacuum, a wide temperature range, and road surface uncertainty. A crewed rover will have a habitation function that will support astronauts in space for more than 30 days in shirtsleeves and a driving function with a lifetime of more than 10 years. This paper reports the status of the study based on the functional requirements for a crewed pressurized rover.
Preliminary Study of Moisture Absorption and Desorption in CO2 Removal System
(2023 International Conference on Environmental Systems, 2023-07-16) Sakurai, Masato; Shima, Asuka; Hirai, Kentaro; Yamazaki, Chiaki; Futamura, Shotaro; Matsumoto, Satoshi; Saruwatari, Hideki
Removing CO₂ and conserving water efficiently in a spacecraft are crucial. Dehumidifying methods are necessary. This study examined the effects of heating temperature, air flow rate, humidity, and desorption time on absorption time. The ability of Zeolite and CSX-250 to absorb and desorb moisture was clarified by experiment. The experiments showed the potential of CSX-250 to maintain the dew point temperature needed for effective CO2 removal.
Recent development status of Oxygen Generation System for future exploration missions
(51st International Conference on Environmental Systems, 7/10/2022) Futamura, Shotaro; Yamazaki, Chiaki; Matsumoto, Satoshi; Shima, Asuka; Sakurai, Masato; Saruwatari, Hideki
Japan Aerospace Exploration Agency (JAXA) has been developing a highly reliable air revitalization system with a smaller supply for future manned space missions. In this paper, we report the results of long-term continuous operation of the Oxygen Generation System using a sub-scale water electrolysis cell with Nafion membranes or membranes being developed by JAXA. In this study, continuous operation up to 2000 hours was achieved and the characteristics of the two types of membranes were determined. In addition, data contributing to the lifetime of the water electrolysis cell, ion exchange resin, gas-liquid separator, and the hydrogen sensors in the oxygen line were obtained. This paper also presents the lessons learned for the entire system through long-term operation.
The FY2022 Development Status of CO2 Removal System for ISS Demonstration
(2023 International Conference on Environmental Systems, 2023-07-16) Yamazaki, Chiaki; Hirai, Kentaro; Futamura, Shotaro; Matsumoto, Satoshi; Saruwatari, Hideki; Yamamoto, Ayako; Nakagami, Hidetoshi; Nagase, Mutsumu; Kinoshita, Tomohiro; Yoshino, Naomi; Yogo, Katsunori
The Japan Aerospace Exploration Agency (JAXA) is developing a CO2 removal system to strengthen core life-support technologies for future crewed space missions. The ISS demonstrator of the CO2 removal system (DRCS) is being developed as one of the activities demonstrating Gateway's CO2 removal system (CDRS) and is scheduled to be launched in FY2023. This paper reports the results of the DRCS Bread Board Model test and the Proto Flight Model's development status.