Re: Lifeboats in Space

From: Christian Ramos (cramos027_at_yahoo.com.au)
Date: 11/15/04 

Date: Mon, 15 Nov 2004 04:44:53 GMT

"Henry Spencer" <henry@spsystems.net> wrote in message
news:I77387.I4v@spsystems.net...
> In article <41bda7d1@news.syd.ip.net.au>,
> Christian Ramos <cramos027@yahoo.com.au> wrote:
> >> > Small Manual Urine processor, low efficiency OK
> >> Why not just dump it out a valve?
> >
> >You can survive along time with limited amounts of food but not without
> >water.
>
> The problem is that processing urine back into potable water is actually
> fairly complicated, and moreover takes significant amounts of power.

Actually can it not be done fairly easily, using evaporative devices
equivalent to solar stills. Complexity can be added I agree, but it doesnt
have to be overly complex. I've even read of people drinking pure urine in
survival conditions, although I would think the benefits would be negligable
in such a case let alone what the acidity would do to you. No limitations on
power were mentioned. While you wouldnt want to utilise this in a standard
life support situation, I believe it is a valid technique for survival
conditions.
>
> And the payoff is low: you need about 3.5 liters/man-day for food
> rehydration, food preparation, and drinking -- maybe a bit less in
> emergency conditions -- and urine reprocessing will get you back only
> about 1.5.

So you have 4 people with enough water for 20 days and your rescue is 25
days away, I think this urine procesisng would be the difference between 4
survivors and 4 dead people. Also, their was no food preparation or food
re-hydration in my scenario.
>
> It's better to put the mass into more stored water.

I agree in principle, but we are talking a lifeboat.

>
> >...Example, say your water tank is hit...
>
> Tank, singular? Should be multiple tanks.
> --

If you want, still doesnt change the scenario. That is, you will have enough
water for X amount of people for Y amount of days. A emergency situation
outside those parameters would likely mean death if you didnt allow for
alternative methodologies. Any damage to any of those stores reduced means
either X ot Y are reduced or both and possibily some deaths.

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