A great deal of effort went into estimating the mass and power requirements for the ECLSS system. ECLSS serves two purposes: (1) maintenance of the life support environment including trace contaminant control, and (2) recycling of consumables. The ECLSS subsystem was separated into four subsystems: atmosphere, water, waste, and food. The four subsystems were then integrated into one functional system.

The cabin was maintained at 3.1 psia partial pressure (pp) 02, with an acceptable range of 2.83 to 3.35 psia pp 02. The total pressure was regulated to 10.2 psia. The thermal control system maintains relative humidity between 25% and 70% and temperature between 18.3°C and 26.7°C. Carbon dioxide removal needs to offset the metabolic production rate of 0.85kgC02/person/day in addition to technology products that interact with the crew cabin atmosphere.

The discussion of ECLSS systems in the MOB report is somewhat garbled and rather incomprehensible. It is very difficult to follow the logic. A rough interpretation is provided in Table 4.13. The totals are similar but not quite the same as those given in Table 4.11. The logic behind these figures is somewhat obscure. The water figures seem low whereas food, waste, and air seem high.

Table 4.13. MOB estimates for ECLSS requirements. [Based on "Martian Habitat Design, Mars Or Bust (MOB)," Informal Report, University of Colorado, December 17, 2003.]


Food—supply cache

Food processing and storage equipment

Food total

Water—supply cache

Water processing and storage equipment

Water total

Air—supply cache

Air processing and storage equipment Air total

Waste—supply cache

Waste processing and storage equipment

Waste total

Grand Total From Table 4.11

Mass Volume Power

11,100 31.7

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