7 ms·
How is that efficiency calculated, respectively?
by filmor 1y ago
How is that efficiency calculated, respectively?
- philjohn 1y agohttps://www.sciencedirect.com/topics/engineering/fuel-cell-efficiency https://www.sciencedirect.com/topics/engineering/fuel-cell-e... I believe all Hydrogen vehicles are using proton exchange membranes still, which have roughly 40-50% efficiency. And that's before you take into account that even the most cutting edge hydrogen refining processes are around 70% efficient. So 1kWh of energy input (electricity) will net you 3X the motive power when used directly in a BEV than first being coverted to hydrogen, and then converted back into electricity.[1] [1] 0.5*0.7 = 0.35.
- fluidcruft 1y agoBEVs aren't 100% efficient though so it's closer to 2x rather than 3x.
- philjohn 1y agoI’ve also gone for the max efficiency figures for the Hydrogen car. And that’s before we get to the fuel costs - £90 to go 400 miles in a Mirai, versus £5.50 to go 300 in an EV6.
- marcosdumay 1y agoI don't think any hydrogen vehicle in actual use has a fuel cell (and if there's any, it's an incredibly rare exception). They are all internal combustion engines. Proton exchange membranes are very unreliable and expensive. They are also not power-dense, one that powers a bus will be very large.
- ch_sm 1y agoIt‘s actually the opposite: some hydrogen cars that use combustion exist, but they are really, really rare. Almost all hydrogen cars that are road legal use a fuel cell in combination with BEV parts to smooth out/extend power delivery.
- pipodeclown 1y agoThat is completely incorrect, it is the opposite.