cryogenic storage more than compensates for the additional mass due to liquefaction plants and increased solar array and power conditioning requirements. For solar photovoltaic power systems utilizing cryogenic storage, the resulting overall mass reduction is approximately 50% as compared with a system utilizing gas storage in filament-wound pressure vessels. With an approximate 5:1 propellant-to-payload mass ratio to deliver a payload to the lunar surface, the power-system mass saving translates into a considerable propellant mass saving as well. The total lower mass results in fewer launches required for delivery, and, therefore, a significant reduction in launch cost. This is not the only benefit, however. Synergistic user benefits also exist. The cryogenic regenerative fuel cell system can provide a ready supply of liquid hydrogen and oxygen on-site for other uses such as primary fuel cell reactants and cryogenic propellants. However, the added complexity of the proposed system over that of a conventional RFC system must be weighed against these benefits to determine its applicability to a specific mission. Future work on this system will address such issues
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