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Doubts about EVs

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Multiman:
Just to be clear my position is that there are a number of competing technologies and we don’t know which one will win yet.
I don’t know any more than the next person that EVs are THE solution but they are a solution that works for now.
There are huge challenges to the whole question of energy supply going forward, infrastructure, generation etc but anything that makes it possible for us to burn less stuff and makes the UK as a country less dependent on other countries gets my vote.

Multiman:
If the very best IC engines are only 53% efficient after over 100 year of development that’s not great.
They have to be heated up before starting or they will seize and only run for a few hundred miles before having to be rebuilt.
If fuelled by hydrogen or other green hydrocarbons they will still pollute as they produce nitrous oxides during combustion.
This can be reduced but not eliminated by catalysts but they use up precious metals that are in short supply.
Every solution has issues, the jury is out.

Oddjob:
They've started testing Hydrogen instead of natural gas in some towns, from what I've read the only produce water when burnt.

Multiman:
Unfortunately if you burn hydrogen in the presence of nitrogen (our atmosphere is 78% nitrogen) it produces nitrous oxides.
It is much cleaner than burning hydrocarbons though.
If you react hydrogen in a fuel cell there is just water as a byproduct and you generate electricity.

Athame57:

--- Quote from: Multiman on July 07, 2023, 11:47:19 AM ---'They have to be heated up before starting or they will seize and only run for a few hundred miles before having to be rebuilt.'

--- End quote ---
I don't get it. What do we do to heat our engine before we turn that key or stand on that kick start? 

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