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That sounded interesting - until I saw in the paper that: 1 litre of LOHC => 2 kWh Cool? Except: 1 litre of Petrol => 9.7 kWh (according to this: https://gr
by cr0sh 7y ago
That sounded interesting - until I saw in the paper that:
1 litre of LOHC => 2 kWh
Cool? Except:
1 litre of Petrol => 9.7 kWh
(according to this: https://greennav.wordpress.com/2008/03/03/how-much-energy-in%E2%80%A6-cars/ https://greennav.wordpress.com/2008/03/03/how-much-energy-in...)
I don't know about the accuracy of it, but I found this:
https://afdc.energy.gov/fuels/fuel_comparison_chart.pdf https://afdc.energy.gov/fuels/fuel_comparison_chart.pdf
...and it says that 33.70 kWh of electricity is the equivalent of 1 gallon of gasoline; since 1 litre is about 0.26 gallons - that's close to the other number (off somewhat though; 8.76 kWh instead of 9.7 kWh).
Regardless - it all seems to point to that either the tanks in a car would need to be 4-6 times larger - or the engines have to change in some manner to deliver the same level of performance with less energy - or something like that. Probably a combination of both.
I'm making the assumption that the LOHC would be carried on-board the vehicle, as that seems (?) like it would be safer and easier than carrying around compressed hydrogen (embrittlement issues, migration issues, consumer aversion perhaps). I don't know, though, if LOHC is more or less dangerous for consumers to handle like gasoline, or if the dehydrogenation process can be done on-board a vehicle; the paper doesn't go into such detail. It does safe it is safe to store and transport via normal methods, so it sounds like it might be ok in that regard for consumers.
- LifeLiverTransp 7y agoThank you for the reasonable discussion contribution, a rare thing around the fourth. https://core.ac.uk/download/pdf/19496773.pdf https://core.ac.uk/download/pdf/19496773.pdf Well according to this paper lohc still has a better energy density then batterys and we would loose the recharge waits. Also existing infrastructure could be reused and it allows the indefinite storage and transport of renewables, if created at source with no additinal conversion loss. As far as i know there are several varieties in research - with one condensend form (which isnt liquid- sorry im not really a expert on this) - beeing a factor 10 energy denser. https://www.sciencedirect.com/science/article/abs/pii/S0926860X05000189?via%3Dihub https://www.sciencedirect.com/science/article/abs/pii/S09268... I think this one is the paper.. I can not say how serious these technologies are driven. The trad car companies have a lot to loose when the car is reduced to 4 engines and a steering wheel. I still think lithium ion batterys have some use- as birthing help to alternatives, who would otherwise be stuck in development hell.
- spronkey 7y agoRemember that the thermal efficiency of an ICE is far lower than that of an electric motor, plus electric cars can use kinetic energy recovery so get even higher efficiencies.