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-   -   AQUA is fueled by hydrogen (

freebeard 10-13-2019 08:09 PM

AQUA is fueled by hydrogen is powered by liquid hydrogen. How "eco" is that?

The bow reminds me of Captain Nemo's submarine in League of Extraordinary Gentlemen.

But also overlooked is the energy required to make liquid hydrogen. It has to be compressed to 13 times the earth's atmosphere and then cooled to 21 degrees Kelvin, or -421 degrees Fahrenheit. It takes a lot of energy to run the compressors; Praxis, a manufacturer of Liquid Hydrogen, says it take 15 kWh of electricity to make a kilogram of the stuff.

Hydrogen contains 142 megajoules of energy per kilogram; that's 39.44 kWh. So just making it liquid takes up 40 percent of its energy. And that doesn't count the energy required to make the hydrogen from natural gas (because almost nobody is making it through electrolysis) or the losses from storage (about one percent per day). About the only thing that makes less sense than running a boat on hydrogen is running it on liquid hydrogen.
No mention of metallic Hydrogen? I guess that only for space travel.

oil pan 4 10-14-2019 12:01 AM

Diesel fuel would make way more sense.
Might lose 1% per year due to evaporation losses.
Hydrogen is dumb unless you are going into orbit.

rmay635703 10-14-2019 08:20 AM

For some reason this comes to mind.

freebeard 10-14-2019 12:36 PM


For some reason this comes to mind.
Does this happen often?

cRiPpLe_rOoStEr 10-14-2019 10:27 PM

I used to hold higher expectations regarding hydrogen as a fuel in my early teens, and now that I'm turning 30 in just a few months I don't believe it would be more economically viable than a transition to biofuels.

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