Human Missions to Mars by Donald Rapp

Author:Donald Rapp
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

Oxygen ECLSS

510

380

890

Water ECLSS

4500

2700

7200

Even though lunar ISRU might supply the required amounts of oxygen and water, environmental control will still be required. An oxygen-only lunar ISRU system would reduce the mass of the ECLSS by a small amount and it is probably not worth integrating ISRU-produced oxygen to ECLSS. It appears from Table 5.​1 that the ECLSS for lunar outposts might require replenishment of about 3 mT of water per year. A lunar ISRU system that produces water could provide this replenishment but it is likely that it would hardly be worth it, since the reduction in ECLSS mass would be only a few mT. If the lunar ISRU system entirely replaced the ECLSS for water, the mass saving might be greater, but the ISRU system would be sizable since it would have to supply the entire required 40 mT of H2O per year.

Exactly how a water-based lunar ISRU system would be integrated to an ECLSS is not clear. There might be some mass benefits, but they appear to be modest. If the ECLSS works as well as NASA hopes, there may not be much benefit to joining the lunar ISRU and ECLSS systems.

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