Wesley Bruce wrote:
thomas malloy wrote:
Robin van Spaandonk wrote:
In reply to Terry Blanton's message of Wed, 2 May 2007 20:29:15 -0400:
http://www.zenncars.com/home/EEStor%20equity%20investment%20April%2030%202007%20FINAL%202.pdf
[snip]
Inc. The negotiated investment terms also grant ZENN an additional
investment option of up to US $5 million on the same terms,
It isn't permittivity that's the likely problem, it's the breakdown
voltage.
I Searched under EEstor and found an interesting discussion of the
technology. The proposed capacitor would store several KW hrs worth
of energy, it would be stored at 3.5 KV. Someone calculated that the
energy in the charged capacitor would be equivalent to 100 sticks of
dynamite. The BaTi dielectric is brittle, and it was noted that this
sort of device does not fail gracefully, which is a euphemism for
destructive failure.
Given the energies involved, and the mechanical forces which I would
assume would be generated in charging the capacitor, I would assume
it would be a matter of time before it rapidly disassembles itself,
and the car.
But the structure is vitrified ceramic not the dielectric. Its a very
hard brick with no voids, the dielectrics break down does not matter.
Its also in a solid box that negates any easy penetration. I've
corresponded with Dick Weir the principle of EEstor. Its wrapped up
very well and the switching means that if one cap goes its isolated to
that cap.
Let's do a thought experiment here and we'll see. It would seem to me
that the mechanical stresses would eventually weaken the dielectric.
If a fuel tank has the same energy does they mean its as dangerous as
dynamite?
IMHO, this is a nonsequetor. The energy in a Mars bar or a gas tank is
potential, it lacks the other half, O2, and the flame front of a fuel O2
reaction is slow.
No because the reaction has other variables: flame speed and oxygen
supply in the case of fuels. In the case of EEstor caps its the
fracture resistance of the ceramic, the percentage of the caps broken
in a breach and whether there is a earth available and the temperature
of any arc relative to thermal properties of adjacent materials.
It would seem to me that the entire structure would degrade over time
with the mechanical stresses of charging - discharging and road
vibration. When a spot breaks down there will be a big stress on the
surrounding structure. The big factor, IMHO, is the instantaneous
release of electrical energy. 3.5 KV is some potent stuff. IMHO, It
depends on whether the rest of the energy is a package will flow into
this fault.
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