Any references for these claims?Tommy Cookers wrote: ↑07 Dec 2023, 20:54let's try this one more time .....
hydrogen fueling of traditional ICE engines gives poor efficiency because these ICEs have poor efficiency at low% power
so yes hydrogen fuel cells are 'twice as efficient' for road use
but in hydrogen-fueled F1 its 'heat dilution'-type ICE would be 50% efficient (or 55% efficient with MGU-H)
(hydrogen could even be run adiabatically - ie so lean that no heat dump via coolant is needed)
AFAIK F1 only reached 50% because of heat recovery. I somehow have doubts tha hydrogen can do much better.
Even so fuel cells can be more efficient than that. Plus there's no reason not recover energy from otherwise waste heat, increasing the efficiency even further.
But a good question we need to ask is: what's the point in using hydrogen in the first place?
And it's not even a real fuel. It's a really crappy energy storage medium. An economic nightmare. Won't be of much use in the real world.
And if we burn it, it won't even move us away from ICE tech. Which is limited in performance characteristics, edficiency, is mechanically complex, and inherently pollutes, even with hydrogen.