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  • 1
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    Advanced air revitalization system testing (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A previously developed experimental air revitalization system was tested cyclically and parametrically. One-button startup without manual interventions; extension by 1350 hours of tests with the system; capability for varying process air carbon dioxide partial pressure and humidity and coolant source for simulation of realistic space vehicle interfaces; dynamic system performance response on the interaction of the electrochemical depolarized carbon dioxide concentrator, the Sabatier carbon dioxide reduction subsystem, and the static feed water electrolysis oxygen generation subsystem, the carbon dioxide concentrator module with unitized core technology for the liquid cooled cell; and a preliminary design for a regenerative air revitalization system for the space station are discussed.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: NASA-CR-166540 , NAS 1.26:166540 , LSI-TR-406-4
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Performance characterization of a Bosch CO sub 2 reduction subsystem (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The performance of Bosch hardware at the subsystem level (up to five-person capacity) in terms of five operating parameters was investigated. The five parameters were: (1) reactor temperature, (2) recycle loop mass flow rate, (3) recycle loop gas composition (percent hydrogen), (4) recycle loop dew point and (5) catalyst density. Experiments were designed and conducted in which the five operating parameters were varied and Bosch performance recorded. A total of 12 carbon collection cartridges provided over approximately 250 hours of operating time. Generally, one cartridge was used for each parameter that was varied. The Bosch hardware was found to perform reliably and reproducibly. No startup, reaction initiation or carbon containment problems were observed. Optimum performance points/ranges were identified for the five parameters investigated. The performance curves agreed with theoretical projections.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: NASA-CR-152342 , LST-TR-379-11
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Preprototype independent air revitalization subsystem (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The performance and maturity of a preprototype, three-person capacity, automatically controlled and monitored, self-contained independent air revitalization subsystem were evaluated. The subsystem maintains the cabin partial pressure of oxygen at 22 kPa (3.2 psia) and that of carbon dioxide at 400 Pa (3 mm Hg) over a wide range of cabin air relative humidity conditions. Consumption of water vapor by the water vapor electrolysis module also provides partial humidity control of the cabin environment. During operation, the average carbon dioxide removal efficiency at baseline conditions remained constant throughout the test at 84%. The average electrochemical depolarized concentrator cell voltage at the end of the parametric/endurance test was 0.41 V, representing a very slowly decreasing average cell voltage. The average water vapor electrolysis cell voltage increased only at a rate of 20 mu/h from the initial level of 1.67 V to the final level of 1.69 V at conclusion of the testing.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: NASA-CR-167703 , NAS 1.26:167703 , LSI-TR-319-4
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    NASA TECHNICAL REPORTS
  • 4
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    Six-man, self-contained carbon dioxide concentrator subsystem for Space Station Prototype (SSP) application (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A six man, self contained, electrochemical carbon dioxide concentrating subsystem for space station prototype use was successfully designed, fabricated, and tested. A test program was successfully completed which covered shakedown testing, design verification testing, and acceptance testing.
    Keywords: BIOTECHNOLOGY
    Type: NASA-CR-114742 , LSI-ER-170-34
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    NASA TECHNICAL REPORTS
  • 5
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    Electrochemical air revitalization system optimization investigation (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A program to characterize a Breadboard of an Electrochemical Air Revitalization System (BEARS) was successfully completed. The BEARS is composed of three components: (1) a water vapor electrolysis module (WVEM) for O2 production and partial humidity control, (2) an electrochemical depolarized carbon dioxide concentrator module (EDCM) for CO2 control, and (3) a power-sharing controller, designed to utilize the power produced by the EDCM to partially offset the WVEM power requirements. It is concluded from the results of this work that the concept of electrochemical air revitalization with power-sharing is a viable solution to the problem of providing a localized topping force for O2 generation, CO2 removal and partial humidity control aboard manned spacecraft. Continued development of the EARS concept is recommended, applying the operational experience and limits identified during the BEARS program to testing of a one-man capacity system and toward the development of advanced system controls to optimize EARS operation for given interfaces and requirements. Successful completion of this development will produce timely technology necessary to plan future advanced environmental control and life support system programs and experiments.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: NASA-CR-144521 , LSI-ER-247-3
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Technology advancement of the electrochemical CO2 concentrating process (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The overall objectives of the present program are to: (1) improve the performance of the electrochemical CO2 removal technique by increasing CO2 removal efficiencies at pCO2 levels below 400 Pa, increasing cell power output and broadening the tolerance of electrochemical cells for operation over wide ranges of cabin relative humidity; (2) design, fabricate, and assemble development hardware to continue the evolution of the electrochemical concentrating technique from the existing level to an advanced level able to efficiently meet the CO2 removal needs of a spacecraft air revitalization system (ARS); (3) develop and incorporate into the EDC the components and concepts that allow for the efficient integration of the electrochemical technique with other subsystems to form a spacecraft ARS; (4) combine ARS functions to enable the elimination of subsystem components and interfaces; and (5) demonstrate the integration concepts through actual operation of a functionally integrated ARS.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: NASA-CR-152098 , LSI-ER-258-11
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Integration of the electrochemical depolorized CO2 concentrator with the Bosch CO2 reduction subsystem (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Regenerative processes for the revitalization of spacecraft atmospheres require an Oxygen Reclamation System (ORS) for the collection of carbon dioxide and water vapor and the recovery of oxygen from these metabolic products. Three life support subsystems uniquely qualified to form such an ORS are an Electrochemical CO2 Depolarized Concentrator (EDC), a CO2 Reduction Subsystem (BRS) and a Water Electrolysis Subsystem (WES). A program to develop and test the interface hardware and control concepts necessary for integrated operation of a four man capacity EDC with a four man capacity BRS was successfully completed. The control concept implemented proved successful in operating the EDC with the BRS for both constant CO2 loading as well as variable CO2 loading, based on a repetitive mission profile of the Space Station Prototype (SSP).
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: NASA-CR-144248 , LSI-ER-237-10
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Development of a static feed water electrolysis system (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A one person level oxygen generation subsystem was developed and production of the one person oxygen metabolic requirements, 0.82 kg, per day was demonstrated without the need for condenser/separators or electrolyte pumps. During 650 hours of shakedown, design verification, and endurance testing, cell voltages averaged 1.62 V at 206 mA/sq cm and at average operating temperature as low as 326 K, virtually corresponding to the state of the art performance previously established for single cells. This high efficiency and low waste heat generation prevented maintenance of the 339 K design temperature without supplemental heating. Improved water electrolysis cell frames were designed, new injection molds were fabricated, and a series of frames was molded. A modified three fluid pressure controller was developed and a static feed water electrolysis that requires no electrolyte in the static feed compartment was developed and successfully evaluated.
    Keywords: ENVIRONMENT POLLUTION
    Type: NASA-CR-166142 , NAS 1.26:166142 , LSI-TR-404-4
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Advanced electrochemical depolarized concentrator cell development (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An advanced electrochemical depolarized carbon dioxide concentrator subsystem, to collect and concentrate metabolically produced CO2 for subsequent O2 recovery in spacecraft, is discussed.
    Keywords: ENVIRONMENT POLLUTION
    Type: NASA-CR-166141 , NAS 1.26:166141 , LSI-TR-379-4
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    NASA TECHNICAL REPORTS
  • 10
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    Technology advancement of the electrochemical CO2 concentrating process (1977)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A five-cell, liquid-cooled advanced electrochemical depolarized carbon dioxide concentrator module was fabricated. The cells utilized the advanced, lightweight, plated anode current collector concept and internal liquid-cooling. The five cell module was designed to meet the carbon dioxide removal requirements of one man and was assembled using plexiglass endplates. This one-man module was tested as part of an integrated oxygen generation and recovery subsystem.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: NASA-CR-151995 , LSI-ER-258-10
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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