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#11
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Iss fuel reserve
"Jeff Findley" wrote
Sure, you just launch with enough oxygen, water, and food to last the duration of the flight. How much food, water, and oxygen is needed per person day is something that is well understood by NASA. About 25-30 kg/day-person, no? |
#13
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Iss fuel reserve
On 2004-07-23, Allen Thomson wrote:
"Jeff Findley" wrote Sure, you just launch with enough oxygen, water, and food to last the duration of the flight. How much food, water, and oxygen is needed per person day is something that is well understood by NASA. About 25-30 kg/day-person, no? Zubrin gives "NASA standard figures" (although slightly modified by him) as: 4kg potable water, 1kg whole food, 0.5kg dried food, 1kg oxygen, 26kg washing water. The 1kg whole food, he notes, is a change from 0.13kg dehydrated food - he doesn't say if he also adjusted the potable water figure to go with it, but notes that with decent recycling it likely balances out. So about 30kg/person/day, mostly through washing water, before any recycling happens - which will make significant inroads. This doesn't cover other consumables, mind you; clothing, pressurisation gases for the air... -- -Andrew Gray |
#14
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Iss fuel reserve
Andrew Gray wrote:
Zubrin gives "NASA standard figures" (although slightly modified by him) as: 4kg potable water, 1kg whole food, 0.5kg dried food, 1kg oxygen, 26kg washing water. I would question the 26kg washing water though. On ISS, there is no "shower". They use russian pre-hydrated towels to wash. 26 litres of water is a hell of a lot. Also, and more importantly, the ISS does collect water from humidity in the air. So the water that evaporates from the wet towels makes it back to the condensors and is then re-used. |
#15
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Iss fuel reserve
On 2004-07-24, John Doe wrote:
Andrew Gray wrote: Zubrin gives "NASA standard figures" (although slightly modified by him) as: 4kg potable water, 1kg whole food, 0.5kg dried food, 1kg oxygen, 26kg washing water. I would question the 26kg washing water though. On ISS, there is no "shower". They use russian pre-hydrated towels to wash. 26 litres of water is a hell of a lot. He did comment that this was a very generous allocation. However, "showers" have been flown before, on Skylab; this may be where the figure came from. (or from Freedom design documents? Herb might have an idea, he was an ELCSS type). http://www.centennialofflight.gov/es...lab/SP23G4.htm http://grin.hq.nasa.gov/ABSTRACTS/GPN-2000-001710.html has a couple of pictures, Skylab 2 & 3 respectively. Also, and more importantly, the ISS does collect water from humidity in the air. So the water that evaporates from the wet towels makes it back to the condensors and is then re-used. Indeed, this is where your recyling factor kicks in. (Zubrin's estimate was that 90% was achievable without great efforts being taken, IIRC - washing water does have lower standards than potable, so...) -- -Andrew Gray |
#16
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Iss fuel reserve
Note that the Russians did try to fly showers aboard Salyut and Mir,
and finally gave up on the idea. John Doe wrote in message ... Andrew Gray wrote: Zubrin gives "NASA standard figures" (although slightly modified by him) as: 4kg potable water, 1kg whole food, 0.5kg dried food, 1kg oxygen, 26kg washing water. I would question the 26kg washing water though. On ISS, there is no "shower". They use russian pre-hydrated towels to wash. 26 litres of water is a hell of a lot. Also, and more importantly, the ISS does collect water from humidity in the air. So the water that evaporates from the wet towels makes it back to the condensors and is then re-used. |
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