Submitted by filosoful t3_yxm3fo in Futurology
real_grown_ass_man t1_iwps4p1 wrote
Reply to comment by OptimalConcept143 in Overhyping hydrogen as a fuel risks endangering net-zero goals by filosoful
The article you quote has 10 MJ/L as HHV for liquid hydrogen. This is at 20k and 1bar. You will need to account for the cooling device to give a realistic number for volumetric energy density.
4,5 MJ is at 690 bara, which i am confident to classify as very high pressure. Lower pressures are also used, and i’d say that this is in the same ballpark as batteries (in volume). This all follows from your article.
I’d say hydrogen fuelled aircraft are a one of the niches where the high volume and safety measures might prove practical, although hydrogen might also be used to form CH4 or longer C chains from CO2 and turned into a traditional but green fuel.
For home heating or transportation I don’t think hydrogen is very practical. But who knows. I hope i am proven wrong.
OptimalConcept143 t1_iwptosi wrote
If we had the ability to create cheap hydrogen you'd probably have enough electricity to just heat homes that way. Especially when systems like heat pumps can get well over 100% efficiency.
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