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How are you going to store all that hydrogen? You need extremely large and heavy high-pressure tanks, capable of holding 350–700 bar. Methane can be liquefied a
by crote 3y ago
How are you going to store all that hydrogen? You need extremely large and heavy high-pressure tanks, capable of holding 350–700 bar. Methane can be liquefied and stored at only 10 bar.
Hydrogen just doesn't have the density required here. Even if you want to use hydrogen-powered fuel cells, it might make more sense to convert it to ammonia for transport and storage.
- fragmede 3y agohow much hydrogen do you need to store though? it doesn't make sense in cars to me, but water-based vehicles seem like they wouldn't need to store problematic amounts given that they have access to h2o
- hagbard_c 3y agoThat would imply the ship has the requisite power generation on board to produce hydrogen from water, in which case it would be more efficient to use that power to propel the ship. So, yes, the ship would have to take all the hydrogen it needs with it.
- fragmede 3y agooh. I thought we were talking about sails to make electricity to run electrolysis to make hydrogen to run engines. storing enough hydrogen for an entire voyage seems prohibitive to me, but I've not done the math
- hagbard_c 3y agoThere's many ways to store hydrogen ranging from 'cryogenic' to 'dissolved in ... (acetone is a good candidate)' to 'converted to ... (ammonia et al)' to 'compressed'. Ships (can) have a lot of space so that is not much of a problem. Cryogenic is probably not feasible, compressed is probably also out but in between there are many options.