Re: Remember "Bit-Slice" Chips ?

On 12/9/24 4:49 AM, D wrote:

  On Sun, 8 Dec 2024, Rich wrote:
 

D <nospam@example.net> wrote:

>
What about storing it as water, and producing it close to where cars need
to be fueled up? I assume it would be very inefficient and probably
difficult, or else someone would already have done it. But I do not know
any specifics, so just genuinely curious.

>
Hydrogen can be stored very safely as water.  The earth's covered in a
significant amount of "water stored hydrogen". :)
>
The tricky part is you have to put in a rather significant amount of
energy to convince it (the hydrogen) to let go of it's grip with the
oxygen atoms that make up the water.
>
And once you create it, and pump it into the car's pressure tank
(you'll need a pressure vessel unless the car has a cryo-cooler on
board, and the energy expended by the cryo-cooler would dwarf the
energy needed to propel the car), you are right back to the
'embrittlement' problem again.
>
And consider the explosive force stored in a 350-700 bar (your
AI's number) pressure vessel that becomes brittle enough to go "bang".
That's one hell of a bang, even without the hydrogen itself explosively
combusting as part of the pressure release.
>
Plus, the walls of the pressure vessel quite effectively become a
'fragmentation grenade' in the process of going bang.

 But how is this solved in existing hydrogen cars? Hydrogen cars exist, so surely they must have some way to at least mitigate this problem?

   "It" is NOT solved, not at all. They're bombs.
   We keep hearing of exotic compounds that will absorb
   a lot of H2 at relatively low Ts & Ps ... but they do
   not seem to pan out for industrial-scale production
   (kinda like all the 'improved' lithium cells). What
   seem great in a square MM lab test chamber, well .....

As for converting hydrogen "on site" I can imagine two limiting factors.
 1. The speed of conversion. Can you convert hydrogen on site, fast enough, to fill up a car in 5-10 minutes?

   No.
   And a LARGE amount of energy is lost (and heat produced)
   during the conversion. The catalyst people MAY make this
   a bit better, but STILL .....
   And also, from WHERE comes the ENERGY to create the
   electricity to create the hydrogen ? Probably coal/oil.
   Generated H2 from 'intermittent' sources like PVs or
   windmills or whatever ... there ARE uses for it, but
   in INDUSTRIAL settings, not on I-10. Take yer carbon
   advantage THERE and be happy.

and
 2. The cost of converting water to hydrogen in a smaller setup, vs doing it somewhere central and shipping it.

   There's no real INFRASTRUCTURE for dealing with hydrogen.
   It's NOT just the same as NG/propane.
   Hydrogen basically goes into those 4-foot steel cylinders.
   That's IT. Oh, pressure-cycle those 100+ times and somewhere
   in there there'll be a BIG Badda Boom.
   Hydrogen is a drug-induced Greenie hallucination.
   Gotta do MUCH better. It's gotta be REAL.
   OK ... nasty POLITICS ... the further left wants to vastly
   RESTRICT travel. Makes it much easier to CONTROL people, even
   limit their experience of what happens 'elsewhere' so the
   Ministry Of Truth (John Kerry in charge, of course) can create
   entire new realities.
   As such, CRAP/expensive/impractical vehicles SERVE that
   purpose. They want your entire existence/experience to
   be within 'bicycle range'.
   Yes, evil-minded people DO exist - and too many of them
   go into Government.