Browsing by Author "Bush, Richard"
Now showing 1 - 3 of 3
- Results Per Page
- Sort Options
Item Development of Carbon Dioxide Removal Systems for Advanced Exploration Systems 2013-2014(44th International Conference on Environmental Systems, 2014-07-13) Knox, James C.; Gauto, Hernando; Gostowski, Rudy; Watson, David; Bush, Richard; Miller, Lee; Stanley, Chris; Thomas, JohnThe Atmosphere Revitalization Recovery and Environmental Monitoring (ARREM) project was initiated in September of 2011 as part of the Ad- vanced Exploration Systems (AES) program. Under the ARREM project, CO2 removal and associated air drying efforts are focused on improving the current state-of-the-art systems utilizing fixed beds of sorbent pellets by seek- ing more robust pelletized sorbents, evaluating structured sorbents, and ex- amining alternate bed configurations to improve system efficiency and relia- bility. These development efforts combine sorbent screening and characteri- zation, testing of sub-scale and full-scale systems, and multi-physics comput- er simulations to evaluate candidate approaches, select the best performing options, and optimize the configuration of the selected approach. The select- ed subsystem is then implemented in a full-scale integrated atmosphere revi- talization test. This paper describes the carbon dioxide removal hardware design and sorbent screening and characterization effort in support of the ARREM project within the AES program. The development of CO2 removal and associated air-drying subsystem models and simulations under the AR- REM project is discussed in a companion paper.Item Sorbent Structural Impacts due to Humidity on Carbon Dioxide Removal Sorbents for Advanced Exploration Systems(45th International Conference on Environmental Systems, 2015-07-12) Watson, David; Knox, James C.; West, Phillip; Stanley, Christine M.; Bush, RichardThe Life Support Systems Project (LSSP) under the Advanced Exploration Systems (AES) program builds upon the work performed under the AES Atmosphere Resource Recovery and Environmental Monitoring (ARREM) project focusing on the numerous technology development areas. The CO2 removal and associated air drying development efforts are focused on improving the current state-of-the-art system on the International Space Station (ISS) utilizing fixed beds of sorbent pellets by seeking more robust pelletized sorbents, evaluating structured sorbents, and examining alternate bed configurations to improve system efficiency and reliability. A component of the CO2 removal effort encompasses structural stability testing of existing and emerging sorbents. Testing will be performed on dry sorbents and sorbents that have been conditioned to three humidity levels. This paper describes the sorbent structural stability screening efforts in support of the LSS Project within the AES Program.Item Sorbent Structural Testing for Advanced Exploration Systems(46th International Conference on Environmental Systems, 2016-07-10) Watson, David; Knox, James; West, Philip; Bush, RichardLong term space missions require carbon dioxide removal systems that can function with minimal downtime required for maintenance, low power consumption and maximum efficiency for CO2 removal. A major component of such a robust system are the sorbents used for the CO2 and desiccant beds. Sorbents must not only have adequate CO2 and H2O removal properties, but they must have the mechanical strength to prevent structural breakdown due to pressure and temperature changes during operation and regeneration, as well as resistance to breakdown due to moisture in the system from cabin air. As part of the studies used to select future CO2 sorbent materials, mechanical tests are performed on various zeolite and silica gel sorbents to determine mechanical performance while dry and at various humidified states. Tests include single pellet crush, bulk crush and attrition tests. In previous years, we have established a protocol for testing sorbents under dry and humid conditions, and tested the sorbents used on the International Space Station carbon dioxide removal assembly. This paper reports on the testing of a series of commercial sorbents that are candidates for use on future exploration missions.