On 15/08/2019 11:12, John Rumm wrote:
On 15/08/2019 09:36, The Natural Philosopher wrote:
On 14/08/2019 22:12, Steve Walker wrote:
Â*From the charts I have just looked at, petrol is about 3.4 times
better than Hydrogen - however, a Hydrogen fuel cell and electric
motors are about 2.6 times as efficient as a petrol engine ... so the
difference is not huge.

ok, si9nce a IC engine tehse days is about 40% efficvient a fuel cell
and motir must be..

TADA!

100% effiucient.

Oh dear.

You seem to be confusing engine efficiency with complete fuel cycle
efficiency.

Petrol efficiency when you look at the whole oil extraction, refining,
distribution cycle, in addition to the engine efficiency is around only
15%, and hydrogen full cycle efficiency is ~25%.

You seem to be confusing engine efficiency with complete fuel cycle
efficiency.

hydrogen *production* efficeiency is down in the 25% mnark

fuels cells are at senevbile p;ower levels very inefficient.


Of course that misses the key point that efficiency does not actually
matter anyway - objectively, both are crap, but it has never hindered
use of petrol.

To real people, what matters is the whole ownership experience. They are
used to a world where you stop at a petrol station, spend 5 mins
refuelling and get another 300 miles of range or better. That is an
experience that fuel cell systems could match with appropriate
infrastructure.

At 5 times the cost.







--
To ban Christmas, simply give turkeys the vote.