Re: "Nuclear energy 'not the solution to global warming"

On Mar 30, 11:30 am, dave.walt...@xxxxxxxxxxx wrote:
On Mar 30, 8:12 am, "bill" <ford_prefec...@xxxxxxxxxxx> wrote:



On Mar 30, 10:25 am, dave.walt...@xxxxxxxxxxx wrote:

Just on geothermal. Bill, having magma/lava/heat close to the surface
does not make it usable. There has to be steam too. This is the single
biggest problem. You can't just lower boiler tubes into the earth's
crust and get usable steam out. It doesn't work like that. All
geothermal that I'm aware of, has *pre-existing* steam packs...sort of
ready-to-go energy. This is why there is only one small geothermal
unit in Hawaii, even though the magma is closer to the surface there
than even in the Geysers area of California.
This is why there is so little *potential* for geotherm in the world
today. I'm 100% for exploiting this free power...it's even cheaper
than hydro because the capital costs are about 1/100th of that of
hydro. But it's not practical since there is no guarantee that water
one injects into the magma can be captured as steam.
David.

Okay. I'll accept your word on this for now, however, I'd like a
cite if possible to explain why pumping water in wouldn't work. It
would seem as though the steam would have very few alternate escape
paths of lower resistance than through your turbine. Not debating,
just asking for reading material.

Yeah, I'd like to know too. PG&E pumps the water back in (after it's
been treated no less!) and THEY don't have an explanation. I suspect
these areas are not closed like a boiler, but have lots of seapage
areas, which is why steam is always rising from the ground like in
Iceland and the Geysers.

The good news is that they can measure the volume, so-to-peak of
what's down there so as to ascertain the energy potential and for how
long it will last.

David


ah! Okay, I have a theory. Possibly the presence or absence of
the existing steam is indicitive of the localized geology? Basically
such that if there are sufficient relief paths to have bled off the
existing steam, then more water pumped in will simply bleed off
throught the same paths?
Any thoughts on hot dry rock geothermal?
http://www.ees4.lanl.gov/hdr/
Still in the demonstrator phase, and probably limited by sites,
but there's potential there :)

.

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