L3-HAB-ATMO-O2
CRITICAL
ENVIRONMENTAL
Level 3 · hardware
Oxygen Generation/Distribution
OGS PEM Electrolyzer + Distribution for Habitat O2
Habitat O2 supply via PEM electrolyzer (or stored reserve) with regulated distribution to maintain target partial pressure during crewed visits.
Purpose
Habitat O2 supply via PEM electrolyzer (or stored reserve) with regulated distribution to maintain target partial pressure during crewed visits.
Context
Child of L2-HAB-ATMO within the Lunar Ark system
Principles
- ▸Target ppO2 21 kPa per ECLSS standard
- ▸PEM electrolyzer source matches consumption
- ▸Backup from L3-ESS-FC-O2TK reserve
- ▸Distributed via low-pressure piping
- ▸Coordinated with L3-WTR-ELEC-CELL
Typical implementations
- ▸ISS Oxygen Generation System (OGS)
- ▸ESA MELiSSA O2 production
- ▸Submarine OBOGS heritage
Lunar considerations
- ▸Ark crewless normally — system provisioned but low duty
- ▸Periodic crewed visit drives sizing
- ▸Long-life PEM cells
Specifications
Functional
| primary function | Habitat O2 supply via PEM electrolyzer (or stored reserve) with regulated distribution to maintain target partial pressure during crewed visits. |
| target ppo2 kpa | 21 |
| max o2 production kg per day | 5 |
Physical
| mass kg | 30 |
| materials | PEM cells, 316L SS piping, Regulators |
| vacuum compatibility | True |
Operational
| power consumption w | 200 |
| thermal range c | -40, 70 |
| lifetime years | 15 |
| mtbf hours | 50000 |
Interfaces
Provides
- O2 supply to atmosphere
Requires
- Primary O2 production
- Backup reserve
Cite this entry
Lunar Ark Codex. "Oxygen Generation/Distribution" (L3-HAB-ATMO-O2). Retrieved 10 September 2026, from https://lunarark.com/entry/L3-HAB-ATMO-O2
Licensed CC-BY-SA 4.0. You may reuse and adapt this entry with attribution, under the same licence.