What do they do with CO2 during EVAs, shuttle and ISS missions?

Well, I guess the subject says it all!

Lee Jay

Lee Jay had uiteengezet :
Well, I guess the subject says it all!

Lee Jay

That will be scrubbed with (help me guys) lythium hydroxide filters.

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André wrote:
Lee Jay had uiteengezet :
Well, I guess the subject says it all!

Lee Jay

That will be scrubbed with (help me guys) lythium hydroxide filters.

Just found some info on the ISS. See ECLSS here. The ISS does the
same thing.

http://www.tsgc.utexas.edu/archive/c...ns/skylab.html

I was thinking that Lithium Hydroxide would be way too heavy for such
long-duration missions but had not heard of this approach before. I'm
not sure what the orbiter does but there was a reference to doing this
on it as well.

Lee Jay

On Sat, 16 Sep 2006 12:25:50 -0500, Lee Jay wrote
(in article . com):

Well, I guess the subject says it all!

Lee Jay


If you want a really long, dry description of the U.S. CDRA, I can
probably work something up later. I worked on most of the fluid
interfaces for this (and the rest of the ARS equipment) way back in the
SSF days.

I'd do it now but I spent pretty much all day watching my daughter's
soccer team in a tournament in 90-degree hear today (with one or two
more games tomorrow). I'm too sunburned and too tired right now. :-p
Alternately, Google can probably find you details.

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Herb Schaltegger wrote:
If you want a really long, dry description of the U.S. CDRA, I can
probably work something up later.

Just knowing the name is a big help:

http://www.hamiltonsundstrand.com/wc...PRD776,00.html

It looks like the EMUs, the Shuttle and the ISS all presently use a
metal-oxide regenerative CO2 system regenerated by either hot air or a
vacuum. Is that correct (information about failures is plentiful,
information about how it's supposed to work is not).

Lee Jay

Current Shuttles just use on Lithium Hydroxyde filters. There was a
period where "long duration" kits included a Lithium hydroxide
regeneration system.

EVAs on ISS on the USA side are able to regenerate used filters with a
devide in QUEST which "cooks" the filters to get the CO2 out and the
later is vented to space. There was an incident at one point where it
was errenously vented to the cabin and the bad small resulted in the
crew going into the russian segment and closing hatches until they
realised what was wrong and fixed it.

ISS on both the russian and USA sides use filters that can be
regenerated. CO2 is dumped to space at the moment during the
regeneration cycle. There are plans in the long term to use devices that
will process the CO2 along with the waste hydrogen (also currently
dumped to space after is electrolysed to produce H2 and O2) which would
produce water.

"Lee Jay" wrote in message
ups.com...
André wrote:
Lee Jay had uiteengezet :
Well, I guess the subject says it all!

Lee Jay

That will be scrubbed with (help me guys) lythium hydroxide filters.

Just found some info on the ISS. See ECLSS here. The ISS does the
same thing.

http://www.tsgc.utexas.edu/archive/c...ns/skylab.html

I was thinking that Lithium Hydroxide would be way too heavy
for such long-duration missions but had not heard of this
approach before. I'm not sure what the orbiter does but there
was a reference to doing this on it as well.

There are actually two systems on ISS to remove CO2 that do not involve
disposable LiOH cartridges.

Russian: Vozdukh
US: CDRA

If you Google around a bit, you'll no doubt find information on how these
work.

This page has three links to diagrams of the Vozdukh system and its control
panels:

http://suzymchale.com/mks/lss-iss.html

Here's a PDF which contains some info on CDRA:

http://www.precision-combustion.com/...2%20Sorber.pdf

Skylab used a molecular sieve to separate CO2 out of the air.

http://www.tsgc.utexas.edu/archive/c...ns/skylab.html

Jeff
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