Browsing by Author "Giesy, Timothy"
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Item Investigation of Desiccants and CO2 Sorbents for Exploration Systems 2016-2017(47th International Conference on Environmental Systems, 2017-07-16) Knox, James; Cmarik, Gregory; Watson, David; Miller, Lee; Giesy, TimothyNASA has embarked on the mission to enable humans to explore deep space, including the goal of sending humans to Mars. This journey will require significant developments in a wide range of technical areas as resupply and early return are not possible. Additionally, mass, power, and volume must be minimized for all phases to maximize propulsion availability. Among the critical areas identified for development are life support systems, which will require increases in reliability as well as reduce resource usage. Two primary points for reliability are the mechanical stability of sorbent pellets and recovery of CO2 sorbent productivity after off-nominal events. In this paper, we discuss the present efforts towards screening and characterizing commercially-available sorbents for extended operation in desiccant and CO2 removal beds. With minimized dusting as the primary criteria, a commercial 13X zeolite was selected and tested for performance and risk.Item Virtual Design of a 4-Bed Molecular Sieve for Exploration(47th International Conference on Environmental Systems, 2017-07-16) Giesy, Timothy; Coker, Robert; O'Connor, Brian; Knox, JamesAs part of NASA’s Advanced Exploration Systems (AES) program and the Life Support Systems Project (LSSP), fully predictive models of the Four Bed Molecular Sieve (4BMS) of the Carbon Dioxide Removal Assembly (CDRA) on the International Space Station (ISS) are being developed. This virtual laboratory will be used to help reduce mass, power, and volume requirements for future missions. In this paper we describe current and planned modeling developments in the area of carbon dioxide removal to support future crewed Mars missions as well as the resolution of anomalies observed in the ISS CDRA.