Human daily intake of food, water and air!
Jan Vilhelm Bakke in the AIR Swegon Air Academy book (published in 2008) stated: “On average, an adult male with a sedentary occupation will breathe about 15 m3, or roughly 15 kg of air, drink 1.5 litres, or 1.5 kg and up to 2 kg, of water and eat about 0.75 kg or about 1 kg of solid food per day.”
Note: This is the total daily intake of a 75 kg adult male.
Have you ever wondered that it is directly related to space-travel?
These figures are similar to the NASA research from published by H. Jones in 2003 (Design Rules for Life Support Systems) and by P.O.Wieland in 1994 (Designing for human presence in space: An introduction to environmental control and life support systems).
H. Jones wrote: “The basic life commodities in order of urgency of supply are oxygen, water, and food. Humans require these resources to support human metabolic needs. They produce waste outputs (carbon dioxide, urine, faeces, etc.) which must be removed while maintaining environmental control.”
General system designs for spaceships are very similar to buildings!
And in the appendix, I found something even more interesting: a list of general system design! And it is very similar to the design rules for buildings. While you read it, try to think about it as you would be thinking about buildings
1. Start with a good system design.
2. Include experienced people.
3. Understand earlier and alternate designs. Focus on differences and choices.
4. Design top-down from the major mission objectives.
5. Review the system design frequently. Find problems early.
6. Everyone should think like a systems engineer.
7. Mission management must ensure the mission objectives are achieved.
8. Design must consider cost, reliability, availability, and safety.
9. Costs will be high. Systems will fail. Lives will be at risk.
10. Life support design must be simple, practical, and austere.
11. Reduce the requirements as much as possible.
12. Simplify the design as much as possible.
13. Focus on subsystem interfaces.
14. Embed digital computers, communication, control,
15. Use computer design tools.
16. No one design can optimize all mission objectives.
17. Performance, schedule, and cost are interrelated. Any two determine the third…