Table IX.—_Requirements for Regenerative Life-Support Systems_ --------------------------------------------------------------------- Requirements / Requirements / 1 man⁴ 3 men (270 man-day System mission)⁵ --------------------------------------- Weight, Power, Weight, Power, kg kW kg kW --------------------------------------------------------------------- Partial chemoregenerative ⁷ 332 1.75 --------------------------------------------------------------------- LiOH 125 1.40 --------------------------------------------------------------------- NaOH 155 7.68 --------------------------------------------------------------------- CO₂-H₂ 34 .36 --------------------------------------------------------------------- Full bioregenerative—algae: --------------------------------------------------------------------- Artificial illumination 116 ⁶ 10.40 591 25.00 --------------------------------------------------------------------- Solar illumination 103 1.70 356 .60 --------------------------------------------------------------------- Electrolysis-_hydrogenomonas_ 55 .25 129 2.60 --------------------------------------------------------------------- ⁴ From [ref.174]. ⁵ From [ref.175]. ⁶ From [ref.176]. ⁷ Includes instrumentation and food storage. The values given in table IX indicate relative weights and powers required by various systems to provide the gaseous environment for manned space cabins. If one considers operating temperatures and hazards, other systems may offer advantages which offset the weight and power advantages of the hydrogen reduction of LiOH systems. Research is being conducted by NASA on life-support-system technology applicable to missions planned for 20 years in the future. Life-support systems include the requirements for supplying breathing gases, control of contaminants in the cabin atmosphere, water reclamation, food supply, and personal hygiene. The disciplines involved in such systems include biology and microbiology, cryogenic fluid handling at zero g, heat transfer, and thermal integration with other systems, such as power. The physiological, psychological, and sociological problems of the crew are also being considered. Photosynthetic System