2021-06-232021-06-237/12/2021ICES-2021-74https://hdl.handle.net/2346/87080Jesus Dominguez, Insight GlobalBrittany Brown, NASABrian Dennis, University of Texas in AustinWilaiwan Chanmanee, University of Texas in AustinPeter Curreri, NASALorlyn Reidy, JacobsEllen Rabenberg, NASAKenneth Burke, NASAICES300: Environmental Control & Life Support Systems (ECLSS) Modeling and Test CorrelationsThe 50th International Conference on Environmental Systems was held virtually on 12 July 2021 through 14 July 2021.The International Space Station (ISS) is currently equipped with a complex, heavy, and power-consuming system that recovers approximately 50% of O2 from metabolic CO2. Future long-duration missions will require a sustainable and highly efficient system capable of yielding a minimum of 75% O2 recovery. A Microfluidic Electrochemical Reactor (MFECR) technology development effort is currently underway at NASA Marshall Space Flight Center (MSFC) to significantly increase current O2 recovery efficiency and reduce the complexity of the system. This paper presents a comprehensive multi-physics 3D model developed at MSFC on CO2 conversion to O2 and C2H4 at standard conditions via MFECR. The 3D spatial domain of the model is a replica of the actual MFECR�s 3D drawing generated for the MFECR�s fabrication and operated to recover O2 from CO2 yielding C2H4 as byproduct. Electrochemical (EC) physics that includes EC multicomponent reaction mechanisms, mass transport, and current density distributions are coupled in the model with all the other physics phenomena involved in the process, such as free and porous fluid flow, multicomponent mass transfer, heat transfer, water condensation, and DC electrical current generation along with Joule heating effect. The authors plan to use experimental results to validate this rigorous comprehensive model and build a reliable simulator that will not only assist the authors on the MFECR design but also optimize its operation.application/pdfengInternational Space Station (ISS).Environmental Control & Life Support System (ECLSS).Metabolic CO2.Microfluidic Electrochemical Reactor (MFECR).Electrochemical CO2 conversion to O2.Presentation