New ISS machine makes water from waste CO2 Thirsty astronauts orbiting the Earth aboard the International Space Station (ISS) have just gained a handy new source of water to eke out supplies shipped up from Earth and those from the station's famously erratic urine recycling system. The new Sabatier Reactor, named for the Nobel prize-winning French chemist who developed …
The output from the Sabatier Reactor is in addition to existing water reclamation systems, particularly the "Urine Processor Assembly" as noted in the article. It's about stretching the existing resources as far as possible to reduce the amount of replacement materials that need to be shipped up.
> NASA will not buy hardware, but instead will purchase the water service. If the system does not work, NASA will not pay for it.
>
> If the reactor works, Hamilton Sundstrand could receive up to $65m by 2014.
Hmm, and if it doesn't work who pays the technician's call-out fee?
"Sorry sir, we don't do free estimates. That'll be $20m for the visit, but don't worry. If it needs
repair the parts and labour are included in your service contract"
A space shuttle launch costs $450 million*, and puts 24,400 kg** of payload into LEO. A litre of water is 1kg. So taking water up on the space shuttle costs $37,500 per litre.
In comparison, under $20,000 per litre seems a bargain.
*http://www.nasa.gov/centers/kennedy/about/information/shuttle_faq.html#10
**http://www.astronautix.com/lvs/shuttle.htm
"...and cooling some electronic equipment."
This seems, um, poorly considered! Is the ISS not actually up in space right now then?
I know they use IBM (Lenovo?) laptops as seen in some of those tour vids, but surely something can be done by putting computing power outside the life supported areas. Might even be able to manage some serious overclocking on those CPUs as a result!
"but surely something can be done by putting computing power outside the life supported areas."
Think of it this way. Space is a very near vacuum. The *entire* structure is inside a vacuum flask.
If you want to dump heat you can do it by conduction, convection or radiation.
Conduction. Nowhere to go.
Convection. No fluid *outside* the structure to convect.
Leaving radiation. Hence the rather large flat structures that aim to dump waste heat into the shadow of the station.
Mine would be the college physics textbook in the pocket.
It's a lot harder than you think to cool off in space. Whilst the vacuum of space is damn cold, it's also lacking one thing that makes cooling efficient: air. On earth, it's possible to efficiently cool your computer using a combination of radiation and air convection. In space you only have radiation, which isn't particularly efficient. The use of radiators in shady spots mitigates the situation, but placing the computer equipment "outside" wouldn't really help matters much and would have the additional problem of requiring the equipment to be rated for use in a vacuum.
> ... but surely something can be done by putting computing power outside the life supported areas.
One must keep in mind that up there in Low Earth Orbit, there is almost no atmosphere (i.e., zero, for practical purposes) outside of the spacecraft to allow for the efficient transfer of equipment-generated heat into a surrounding medium, which would then be carried away by kinetic and/or convective processes.
The only real way to get rid of the heat is by dissipating the energy into the surrounding near-vacuum "photonically" through a phenomenon known as "black body radiation:"
-- http://en.wikipedia.org/wiki/Black_body_radiation
Since direct thermal radiation into a surrounding "empty" void is a very inefficient process (compared to the kinetic/convective transfer of heat between two materials in close contact, like a PC's CPU heat sink with the surrounding atmosphere), heat generated by the station's equipment would build up very quickly if there wasn't a way to get rid if it in a timely manner.
The station maintains its temperature balance by using closed-loop water systems to carry excess heat to giant external radiating panels, which dissipates the heat as thermal (infrared) radiation.
Another way to use this excess heat would be to pass it across a thermocouple, so the excess heat could be converted into electricity for use in charging batteries and running low-power experiments. I wouldn't be at all surprised of the station already makes use of some of its excess heat for this purpose.
It is a common misconception that because space is "cold" that cooling is not a problem. The real problem is that space is largely a vacuum, so there's little gas (nitrogen and oxygen here on Earth) to effect a kinetic transfer of energy-- like how the temperature seems cooler on Earth when the wind is blowing, which we refer to as "windchill."
In space, the primary means of cooling is to radiate the heat energy away as infrared light. To get heat from inside the ISS to the radiators located outside the ISS, they use a circulating system of water (and ammonia) as the heat transfer medium.
Really, NASA explains it far better than I could:
http://science.nasa.gov/science-news/science-at-nasa/2001/ast21mar_1/
Since the graphite would be so pure, it would probably be perfect for conversion into zero-g nanodiamond matrices that could be used for things like constructing ultra-strong, ultra-clear window glass and other "supermaterials."
Vernor Vinge, Charles Stross, William Gibson, and other authors have all mentioned "diamond glass" as being a common material used for window panes in spacecraft and orbiting habitats...
This is a *quantum* leap in NASA's contract negotiating skills. Payment by results. Who'd have thought NASA would *ever* do such a thing. The times are a-changing.
As for NASA shipping stuff that they aren't sure would work what of the liquid handling urine recycling thing that has given much innocent amusement on these pages.
Sending this to the space station may have a secondary agenda for the future exploration of Mars.
Interestingly this has been suggested as a means of producing rocket fuel and other resources on Mars (ref: "The Case for Mars", Robert Zubrin). The plan calls for an Earth return vehicle being sent to Mars ahead of the crewed landers by about two years. The return vehicle would carry with it a few tonnes of Liquid Hydrogen which is reacted with CO2 from the Martian atmosphere after landing to produce Methane and water (which is split back to H2 and O2, H2 being fed into the reaction again and the O2 stored). This way the lander manufactures the propellants for the return trip before the the astronauts are sent to Mars. With no need to take the return propellants with them them the crewed vehicle is much less massive and can built and launched much more easily than a completely self contained mission.
Note also that this technique also can provide the basic living requirements of O2 and water for the astronauts on Mars.
This can also be further extended if a ready supply of water ice can be found close to the landing site, thus allowing more H2 to be produced.
Zubrin has called this "living off the land" with respect to Mars and sees it as a "game changing" concept for human exploration of Mars and eventual colonization. It has been seriously suggested that this technique be trialed by using it to fuel a unmanned Martian sample return mission.
Anyone interested in finding more search for "Mars Direct" in a good search engine near you.
Andrew Newstead
The Register 
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