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Producing hydrogen for fuel uses water very inefficiently


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You can convert 1000 g of water to 1650-3333 g of oil.
But the same 1000 g of water gives only 112 g of hydrogen. Hydrogen fuel efficiency is about 1.5-3 times better but still it takes like 14 times more water and you also need to cool hydrogen. It's 8000+ Kg (yes, 8000000 g) of water per rocket launch!

So guys what do you think about using hydrogen fuel and where do you get so much water?

perhaps they have like 5 hydrogen vents?

i just searched on tools not included (the seed browser), and found a world with 5 hydrogen vents

the average output is still only a little more than 110 g/s, so they cant be used.

(hydrogen vents needs a buff. like, 5 produces as much as a single electrolyzer!)

Stick to petroleum rockets for most of your space exploration. It's more efficient even in terms of trading water for fuel at an oil well.

Hydrogen rockets are indeed very expensive, but remember that rockets take many cycles per journey and the overall g/s cost of them isn't terribly high.

Catch the steam of the hydrogen rocket and cool it down. That way you can even gain a lot of water with every start, depending on destination. With petroleum rockets you only get hot CO2, pretty worthless in that amount. 

And you will need oxygen for your dupes anyways, why not use the hydrogen from electrolyzers.

If you condense the steam that is being exhausted from the hydrogen engine, you end up with more water than you used to fill it with hydrogen.

Depending on the size of your launch silo ofc.

 

If you produce oxygen from polluted oxygen (e.g. off-gassing rot), you dont need to spend water to supply your dupes.

Every dupe produces more water than he consumes by using the toilet.

 

And finally you can gain water from boiling oil to NG and making power out of it. (and then using part of that water to get new oil from wells).

 

If you improve your colony, you shouldnt have any water problems anymore.

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