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A dense, actively-growing stand of wheat will be grown to provide a minimum of one human metabolic load of oxygen production and carbon dioxide removal through the process of photosynthesis. The test subject will reside in the chamber's air lock, which will be set-up with accommodations for habitation. ...Three different methods of gas composition control will be evaluated in series over a continuous 15-day period: 1) use of P/C systems and storage buffers to trim off differences in metabolic rate between the test subject and plants; 2) modulation of photosynthetic rate to match the test subject's metabolic load by active control of photosynthetic photon flux and 3) modulation of photosynthetic rate to match the test subject's metabolic load by limiting the amount of carbon dioxide available to the plants.

Micrometeoroid and orbital debris (MMOD) penetration hazards have been a concern for the large number of EVA’s (Extravehicular Activities) expected during the assembly and operation of the International Space Station (ISS).

To control the CO2 level, the Shuttle used LiOH canisters and the ISS used the Vozdukh or the Carbon Dioxide Removal Assembly (CDRA) with the Vozdukh being the primary ISS device for CO2 removal. Analysis predicted that both the Shuttle and Station atmospheres could be controlled using the Station resources with only the Vozdukh and the CDRA.

The design of the Orion Environmental Control and Life Support (ECLS) system, which includes the life support and active thermal control systems, is progressing through the design stage. This paper covers the Orion ECLS development from April 2008 to April 2009.

Beyond this, however, removal of some system constraints allows for a re-design of the tool suite in such a way as to provide for greater flexibility, an expanded scope of calculation, the addition of Graphical User Interfaces (GUIs), improved calculation stability and precision, and an additional increase in speed due to “in-lining” calculations and reconstructing of the algorithms in a manner which calls for fewer elemental calculations, as well as time saved through better interfaces with geometry models and code input routines.