Re:BHP says battery electric cheaper than hydrogen as it dum...
by _hypx on Tuesday August 01, 2023 @03:08PM
(#36960966)
You'd likely send via pipelines or tanker trucks instead.
Re:BHP says battery electric cheaper than hydrogen as it dum...
by c_o_n_v_e_x on Wednesday August 02, 2023 @03:23AM
(#36968015)
Hydrogen doesn't make sense to transport. You contend with cryogenics / boil-off for tanker trucks or ships. Pipelines you're dealing with poor volumetric energy levels (you use comparatively more units of energy to move one unit of h2).
Re:BHP says battery electric cheaper than hydrogen as it dum...
by _hypx on Wednesday August 02, 2023 @05:13AM
(#36968684)
Boiloff is not that big of a deal if you are using the fuel right away. It is the same story as with LNG.
Re:BHP says battery electric cheaper than hydrogen as it dum...
by c_o_n_v_e_x on Wednesday August 02, 2023 @08:37PM
(#36979846)
I replied to your comment that was talking about transportation... i.e. not using it right away.
H2 has a daily boil off 5 times greater than LNG. https://www.sciencedirect.com/science/article/pii/S277265682...
Not only that, liquid H2 has worse energy density than LNG. So again, you're spending more units of energy to comparatively more less units of energy.
Re:BHP says battery electric cheaper than hydrogen as it dum...
by _hypx on Wednesday August 02, 2023 @09:16PM
(#36980127)
You can liquefy hydrogen on the spot. You don't need to move LH₂ around. If that does become necessary, the solution is improved insulation. Modern materials can reduce boil-off to that of LNG's. In fact, LNG was once seen as impossible because of its boil-off concerns at one point.
You will need bigger tanks but the fuel is much lighter. It is a solvable problem.
Re:BHP says battery electric cheaper than hydrogen as it dum...
by c_o_n_v_e_x on Thursday August 03, 2023 @08:29PM
(#36993915)
>Boiloff is not that big of a deal if you are using the fuel right away.
>You can liquefy hydrogen on the spot. You don't need to move LH₂ around.
Why are you liquefying H2 if you are using it right away and or not transporting it? Liquefaction is to optimize for storage. You're all over the shop.
Will point out takes a decade now to produce a blue print aircraft. So if we started designing one now it would be flying when 2033? China rolled out a high speed rail network in ten years. You could do that in the US and other places.
Notable point. The complaints I hear about high speed rail in Europe is tickets cost more than airplane tickets and the trains are always full. The explanation is the ergonomics and logistics of passenger aircraft sucks.