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Originally Posted by acrosome
I'm missing your point, there. Can you dumb it down?
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Sure!
Quote:
Chemical Refinery (TL7): Different types are possible, but
the most common spacecraft type processes ice or water into
hydrogen and oxygen for rocket fuel or reaction mass.
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You're not creating rocket fuel out of nothing. You're taking ice or water, and
refining it into rocket fuel. So you couldn't strictly have a perpetual motion machine, because you'll run out of (usable) water or ice. I suppose in your specific case, you might be able to trap the water being burned by the fuel cell for the purposes of making fuel-cell fuel, and then feed it to the refinery to make more fuel-cell fuel. I suppose that's what you mean by a perpetual motion machine?