The energy for liquefaction of oxygen is being assumed to be LOX: E/m = 5 KWhe/kg. Thus, the total energy demand per year for allocation of propellant is given by: Assuming a capacity of factories for electrolysis and liquefaction of 8000 h/yr the required net power is Pnet = 3.6 GW equivalent to 36% of one 10 GW-SPS. Hence, this seems to be justifiable from an economic viewpoint. The specific cost for allocation of LH2 is given by the sum of costs for electrolysis, liquefaction and storage multiplied with the factor of the evaporation rates: The production of propellants far from the space center is not economical because two more transfusions (~ 16 %) and transport (0.1% per day) would yield a considerable increased evaporation rate and the transport would have to be paid. In addition, the factories are technically simple. So the production near the space center is not a problem. The total cost for allocation of LHj is Ktot (LH2) = $ 8.15/kg
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