Many friends have asked if Audi can make diesel from thin
air.
Yes Audi can make diesel from air but only with a lot of
added energy. There are no free lunches
in America and there is no free energy in the universe. The process can use solar electricity or wind
electricity to electrolyze water to produce hydrogen. Even with their claimed
steam electrolysis this will only be approximately 55% efficient. Then the reaction of CO2 with hydrogen to
yield Carbon Monoxide and water is approximately 80% efficient. Then they must react carbon monoxide with hydrogen
to make diesel and water. This is again
about 70% efficient. All in all the
process is about 35% efficient and kid of pointless. The fuel is then used in a diesel engine that
is 30% efficient and hence only about 10% of the Kwh in the electric power will
get to the wheels of the diesel Audi.
One could easily take the electrons from the solar or wind
farm and charge lithium ion batteries in a plug in car. This will be 90% efficient in getting power
to the wheels. Audi is proposing a Rube
Greenberg Scheme. The cost of this diesel
will be enormous and it simply wastes 90% of the energy in the renewable
electricity rather than using 90% of the energy in the electrons.
For surface transport, once the infrastructure is in place, yes. But liquid fuel is the sine qua non for air transport, other than ultra specialist uses such as long time on station aerial surveillance where very large and long wings support solar cells, batteries, and a camera. Regardless of 10% of the kWh in the electric power getting to the turbine wheels of the turbofan engine, a carbon neutral, fossil fuel free liquid fuel for aircraft is an essential development.
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