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la-tsla-fan

09/25/22 1:10 PM

#69795 RE: 20stockman20 #69790

ABSOLUTELY NOT. The reason is that hydrogen whether gaseous at normal conditions or liquid at extremely low temperatures has an extremely low density. Therefore a kg of hydrogen occupies about 12 liters of volume at normal conditions and just over 14 liters as a liquid. (I realize these numbers sound counter-intuitive; please google 'hydrogen density' to reassure yourself). The liquid requires a temperature of -253 degrees Celsius.

The solution is to compress hydrogen. Typical pressures used are 350 bars which is approximately 5,000 psia (psi absolute, as opposed to psig (psi gauge which is relative to atmospheric pressure) ). Even higher pressures (up to 700 bars) are used in passenger cars. Even at the higher pressures, hydrogen density reaches only 42 kg/m3, which is just over 5% of diesel density. Therefore, even at the horrendously high pressures, tank volumes of 10 times those in conventional diesel trucks are required. Typical hydrogen trucks use 7 high-pressure tanks:

"Each hydrogen truck features a 190 kilowatt fuel cell comprised of seven high-pressure tanks holding around 35kg of hydrogen. This provides a long distance range of about 400km before refuelling (sic, British spelling?) ) is required, which far surpasses the capabilities of vehicles powered by electric.”

This is taken from

https://www.luxfercylinders.com/news/hydrogen-trucks

Another factor that weighs against HFCVs is energy efficiency:

'HFCV’s offer less than 1/3 the efficiency of BEV’s.'

This quote is taken from

https://carsalesbase.com/electric-vehicles-vs-hydrogen-fuel-cell-vehicles/