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7. Evaluation of models based on oxygen production at 1 kg/s Table 1. Results for the production of 1 kg/s of oxygen Bosch process with three compressors Bosch process with at sub-atmospheric conditions Bosch process with 1 compressor Sabatier process Co-electrolysis integrated Sabatier with recuperation Co-electrolysis integrated Sabatier without heat recuperation Co-electrolysis integrated Boudouard Co-electrolysis integrated Hydrogenation CO2 in (kg/day) 1.310 1.310 1.310 0.786 0.638 0.638 1.375 1.375 water in (kg/day) 0.033 0.035 0.040 0.588 0.618 0.618 0.000 0.000 total electric power (watts) 212 217 244 207 185 242 211 199 V. Analysis of Process Models The scale of the process models was set at 1 kg/s of oxygen production to compare the processes. Table 1 shows the carbon dioxide and water inputs and the total power for oxygen production at I kg/ s. Tables 2 and 3 list the type and number of equipment required for each component with either power usage or duty needs. Table 2 is useful in estimating the overall system mass for each process. The highest flow of CO2 is associated with the co-electrolysis integrated Boudouard and Hydrogenation processes which also have no water input. The Bosch processes have slightly less CO2 flows but require small amounts of water. Table 2. Equipment for the production of 1 kg/s of oxygen, part 1 compressors pumps valves duty # of (watts) units 317.3 1 312.0 2 401.5 0 0.0 2 59.7 2 9.1 2 18.4 0 29.4 0 heat exchangers Bosch process with three compressors Bosch process at sub-atmospheric conditions Bosch process with one compressor Sabatier process Co-electrolysis integrated Sabatier with recuperation Co-electrolysis integrated Sabatier without recuperation Co-electrolysis integrated Boudouard Hydrogenation with Co-electrolysis # of power units (watts) 3 5.87 1 10.3 1 37.4 1 0.23 1 0.42 1 0.32 3 0.79 2 1.33 # of power units (watts) 1 3.02E-06 2 6.72E-04 1 3.38E-05 2 2.96E-04 2 2.17E-04 1 1.94E-04 0 0 0 0 # of units 1 1 1 0 3 1 2 2 19 American Institute of Aeronautics and AstronauticsPDF Image | CO2 and Steam Co-Electrolysis for Resource Utilization in Space
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