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In a closed space system at a ground test facility with environmental control and life support system, carbon dioxide as the products of human and animals respiration is adsorbed and condensed by solid amine and desorbed by aqueous vapor (steam). The carbon dioxide is then reduced to methane and water using hydrogen. Oxygen is recovered from the produced water using an electrolytic system with a solid polymeric membrane and will be reused for respiration. This report describes the result of the fundamental research on individual technological elements: the reduction of carbon dioxide using hydrogen, the decomposition of produced methane and the water electrolysis.

A CAD/CAE procedure has been used for the analysis of the flow in an intake port-valve-cylinder assembly of a DI Diesel engine. The flow was simulated for both, steady state conditions and transient motored situation during intake and compression strokes. The characteristics of the helical port are analyzed, for the steady state case, in terms flow rate, generation of angular momentum flux and induced in-cylinder flow motion. The results of the simulation were correlated with experimental results, consisting of oil film visualizations on valve and intake port surfaces, and of local velocity measurements in the cylinder. The transient flow simulation shows the different characteristics of the flow motion in cylinder and piston bowl during intake and compression strokes. It was observed that the swirl generating capacity of the valve is different between the valve opening and closing phases.