RE: Hydrogen nothing more than a bubble it seems...17 Oct 2022 19:27
SatellitePro, the only counter-arguments I have left are in relation to 1) battery lorries and 2) excess energy storage.
1) Liebriech et al. suggest that battery lorries will work because you only need 4 hours battery life (120-160miles) and drivers will recharge during legally-required breaks and delivery points. Those will both be high-speed chargers. Each time that case is made there is never an explanation of what's involved. and I suggest that what's involved is non-trivial. Each lorry requires 400-600kWh batteries for the proposed minimum battery life. A 20 minute delivery slot requires a 500kW charger (50 miles) installed at company expense. I'm not convinced that such power and expense will be provided by many companies receiving deliveries. Multiple banks of 500kWh chargers at truck-stops the length and breadth of Britain also seems like a tall order, but I'd like to see a legitimate proposal by the proponents.
2) Excess energy from a wind turbine is a power limited, not energy limited. Whereas a solar panel is energy limited (8-10 hours of sunlight) and can therefore be matched to a battery for storage, the same is not true for a wind turbine. The wind may blow continuously for 10 days delivering continuous power. A battery would fill with energy in a finite time rendering it useless thereafter. Alternatively a constant stream of power into an electrolyser simply keeps generating hydrogen as long as the blades keep turning. Offloading the hydrogen generated into storage tanks or pumped away through a pipe is a trivial hurdle. Batteries are limited stores of energy, electrolysers are limitless converters of power.
Remember, power and energy are not the same thing.