Abstract
Two feasibility studies described here explored the conditions necessary for a life support system suitable for a manned space vehicle. White rats were placed in a closed system with a recirculating air loop. Solid potassium superoxide was used as a combination oxygen generator and carbon dioxide absorber, and potassium hydroxide was used as a supplemental carbon dioxide absorber. At the conclusion of the 25-day test period the rats remained alive and healthy. A thorough chemical analysis was performed to determine the average animal respiratory quotient and chemical system efficiencies. Three human subjects were maintained for 14 days in a sealed-environment life support system with dual air regeneration loops. The air regeneration system, was evaluated at various oxygen and carbon dioxide partial pressures and relative humidities. At the conclusion of the test period, the subjects were examined and judged healthy.