yes fuel cell 60% thermally efficient but using fuel that takes up more space, I get that.
I cant find a comparison with my question directly which is the answer we need.
All the data is skewed to whoever is writing it or the baseline they use is so far out like ICE 25% efficient etc.
Slow speed diesel and some turbines are at 50%.
Yet another with a forklift comparison says fuel cell doesnt beat battery or lpg via ice unless it also uses a battery hinting that there is an optimum output that a fuel cell needs to be at?
But they are measuring total power in ( including making the fuel) to forklift consumption.
Some data on the Toyota Kenworth project, using hydrogen truck does 200miles on a fill and the drive train weighs the same as the the original? does that mean its same weight as 200miles diesel fill up?
But for road vehicles they all seem to have a battery as well. For a ship its all uphill so no downhill regen parts.
Found a US gov doc from GM, hydrogen fuel cell 2kg/kw at 2.5ltr volume/kw, 24,000ltr in 40’ container so almost 10Mw per 40 box, so maybe same space as main engine but 10 40’ boxes on 22,000teu ship easy to lose.
ABB built a 135.000hp electric motor for NASA wind tunnel
Excluding its coolers and other accessories,
the motor occupies a space 3.65 meters long,
6.1 meters wide and 7 meters high.
Still got room for twice the fuel if lpg but what is power density for lpg fuel cell?
Certainly going to work for all the OSV’s in the new field in Ozzie where the Prelude can refuel them but they will be ICE I imagine.