Re: TransHab as storm shelter
From: Josh Gigantino (gigantin_at_shore.net)
Date: 06/15/04
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Date: 14 Jun 2004 21:17:38 -0700
henry@spsystems.net (Henry Spencer) wrote in message news:<HyHHGv.M0M@spsystems.net>...
> In article <d5952843.0405251937.5cebfbc9@posting.google.com>,
> Josh Gigantino <gigantin@shore.net> wrote:
> >> 20cm or so of water is a good storm shelter for interplanetary space or
> >> high orbit. (There's no point in having it in LEO...
> >
> >20cm is enough for shelter from solar storms?
>
> Probably, yes -- it depends a little bit on what assumptions you make and
> how conservative you are.
OK. Crew survival is paramount. 8) Is there a decent layman's source
about space radiation and the Van Allen Belts?
> For LEO, it depends a little on which LEO you're in, but by and large you
> don't need a lot of shielding. For an orbit passing through the belts
> with any regularity, you'd need a bunch, but I don't have numbers on hand.
> Out in deep space, you want either complete shielding (5-10t/m^2,
> impossibly heavy for near-future vehicles) or else a small shielded storm
> shelter and relatively little shielding on the rest.
My own use for this idea is mostly as a HEEO tank farm for my stories.
The setup would be on a large double truss, with inflatable tanks and
the manned sections having zip-together water layers. Would the
shielding required while going through the Belts then pose a danger on
the long loop away from Earth?
> >...Waste heat and available water could be used for humidity control.
>
> Humidity control in a manned spacecraft with a recirculating air system
> generally means dehumidification, not humidification. Human bodies put
> out substantial amounts of water vapor.
I was wondering if there might be a way to create
temperature-controlled panels (or a hydrophilic plastic) that could
transfer atmospheric moisture into hull-graywater tanks? Similarly,
would there be ways to use the waste heat, probably as tubes in the
radiator, to heat potable water?
> >Would the water (plus several layers of kevlar, bladders, etc) provide
> >enough meteorite/impact protection?
>
> The way to protect against micrometeorites (and in LEO, space debris) is
> with multiple thin "bumper" shields spaced well out from the main hull.
..
>Wider gaps are more effective than
> more mass, and multiple thin walls are more effective than one thick wall.
It seems like inflatable barriers in general are the answer to this,
vs metal hulls. Much more bumper space can be achieved by adding
baggier outer layers.
> >Would it be correct that a HEEO application might be the only
> >reasonable use of this type of inflatable? Would it actually be more
..
> Right, you *don't* want to live inside 20cm of shielding in deep space,
Do you have any other thoughts on designing a HEEO tankfarm using
modules like this? This would be mostly a water station - sending
filtered water, H and O (plus some other volatiles) to LEO and the
moon.
Josh
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