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big_trike t1_iy9zoxw wrote

Reply to comment by Hoosierguy2 in Rolls-Royce successfully tests hydrogen-powered jet engine | Britain's Rolls-Royce said it has successfully run an aircraft engine on hydrogen, a world aviation first that marks a major step towards proving the gas could be key to decarbonising air travel. by yourSAS

>Problem was they couldn't figure out how to store enough cryogenic hydrogen and keep it cryogenic to make it work.

That's still an unsolved problem. Liquid hydrogen only has 1/4 the energy density of gasoline, although it is significantly lighter per joule of energy. Some more research is also needed to figure out a way to efficiently split water, IIRC current methods lose a significant amount of energy to heat. Long term, I think battery technology will be the best bet for cars and airplanes and we might see hydrogen in use for grid balancing.

If I had to guess, I'd think the majority of hydrogen research funding comes from fossil fuel companies as they'll be entirely obsolete if the planet shifts away from liquid fuel.

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Anaxamenes t1_iya5zyz wrote

I was just looking at the Google server building here in my area and it’s really too bad we can’t build something next to it to take advantage of the heat it generates to cool the servers. The same would be useful for hydrogen, if we could just put a useful business next door that needs the heat, we could start being more efficient.

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Reveal101 t1_iya9lre wrote

I used to build smart homes with automation etc. I once ducted the waste heat from the server racks into the elevator shaft in the middle of the house to capture some heat in the winter with a vent to switch the exhaust outside in the summer (this was in Canada)

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Anaxamenes t1_iyaf838 wrote

A home with a server rack? Sounds expensive. Pretty good idea though. I was thinking about our dryer vent and how to capture that wasted heat in the colder months.

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Reveal101 t1_iyag2gd wrote

The clientele I worked for typically spent anywhere from 2-20 million dollars on their homes with our contracts ranging anywhere from $50000 to a million for all the A/V, lighting control, security, surveillance, and full systems integration with HVAC and gates, garage doors, hot tubs, self playing pianos, etc. Whatever they wanted. This was the high end of home automation, mind you.

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