Browsing by Author "Chambliss, Joe"
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Item Characterizing Cryogenic Carbon Dioxide Capture for Life Support Systems(47th International Conference on Environmental Systems, 2017-07-16) Belancik, Grace; Jan, Darrell; Huang, Roger; Paredes-Garcia, Jordi; Chambliss, JoeWithout a vastly improved cabin air CO2 removal system technology, deep space missions will not be plausible. The carbon dioxide removal assembly (CDRA) on ISS has repeated replacement and maintenance costs due to adsorbent material degradation. A current effort to evaluate CO2 removal systems to succeed CDRA is underway. Alternative adsorption and thermal amine technologies are included. Cryogenic capture of CO2 in a cabin atmosphere is a newly-explored solution. Cryogenics are highly reliable, self-sufficient systems with great potential in this area of study. The added benefit of a cryogenic system is that it can provide humidity and trace contaminant control in addition to CO2 capture. Whereas cryogenic cooling technologies are established and Mars atmosphere CO2 capture has been tested, little research has been done on the application of cryogenic cooling to life support CO2 capture. This paper describes the design, build and initial functional testing of a lab-scale cryogenic system to remove CO2 from simulated cabin air. The system is ready to test both CO2/N2 mixed and dry CO2-loaded air, and production rate, cycle time, and power requirements will be characterized so that future flight-like system requirements may be better modeled.Item Development of a Water Recovery System Resource Tracking Model(45th International Conference on Environmental Systems, 2015-07-12) Chambliss, Joe; Stambaugh, Imelda; Sargusingh, Miriam; Shull, Sarah; Moore, MichaelA simulation model has been developed to track water resources in an exploration vehicle using Regenerative Life Support (RLS) systems. The Resource Tracking Model (RTM) integrates the functions of all the vehicle components that significantly affect the processing and recovery of water during simulated missions. The approach used in developing the RTM enables its use as part of a complete vehicle simulation for real-time mission studies. Performance data for the components in the RTM are focused on water processing. The data provided to the model have been based on the most recent information available regarding the technology of the component. This paper will describe the process of defining the RLS system to be modeled, the way the modeling environment was selected, and how the model has been implemented. Results showing how the RLS components exchange water are provided in a test case.Item The ISS TCS System Manager Experience(48th International Conference on Environmental Systems, 2018-07-08) Chambliss, JoeThe experience of being a System Manager (SM) during the early years of the International Space Station (ISS) Program is probably similar to the experience a future SM will have in an international exploration or commercial space program. Thus; it is relevant to provide an overview of the ISS Thermal Control System (TCS) SM experience to inform future SMs of the scope and nature of the role. Overviews of the connection to the Space Station Freedom (SSF) Program and the political environment at the start of the ISS program are provided. The scope of the ISS Thermal Control System SM role is then described via the system architecture. How the ISS program was initiated, what the SM roles were and how those roles evolved as the program proceeded are addressed as are interactions with US contractors, NASA centers, and International Partners (IPs). The SM involvement with the Russian Mir Program is described with some of the lessons learned during that NASA/Russian program. The interactions with IPs is described with several anecdotes of how interacting with counterparts in Russia, Europe and Japan was accomplished. Several challenges to the technical content of the TCS system are provided as examples of how the ISS TCS design evolved to address problems. Finally, some lessons learned are provided along with recommendations on how to prepare to be a SM for a future program.Item Resource Tracking Model Updates and Trade Studies(46th International Conference on Environmental Systems, 2016-07-10) Chambliss, Joe; Stambaugh, Imelda; Moore, MichaelThe Resource Tracking Model has been updated to capture system manager and project manager inputs. Both the Trick/General Use Nodal Network Solver Resource Tracking Model (RTM) simulator and the RTM mass balance spreadsheet have been revised to address inputs from system managers and to refine the way mass balance is illustrated. The revisions to the RTM included the addition of a Plasma Pyrolysis Assembly (PPA) to recover hydrogen from Sabatier Reactor methane, which was vented in the prior version of the RTM. The effect of the PPA on the overall balance of resources in an exploration vehicle is illustrated in the increased recycle of vehicle oxygen. Case studies have been run to show the relative effect of performance changes on vehicle resources.