this post was submitted on 30 Nov 2025
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Also the water is just a medium for energy transfer; it can be reused & recycled in near perpetuity in a closed system.
We're used to open systems with water in power stations, including cooling towers etc, because water is abundant on earth so it's cheaper to just dump it back into the atmosphere; we probably take the whole thing for granted.
But it could be engineered to be a closed system a bit like a coolant in a refrigeration unit cycling back and forth. And it probably will need to be a closed system in the future in space where water will be incredibly precious.