flobert (in firstname.lastname@example.org) said:
<groups trimmed, much snippage>
| A little aside that was thrown in to one of my lectures at
| university (a few years back now) was that it takes more energy to
| create a solar cell, than that cell will produce in its lifetime.
| Admittedly, I ahven't kept pace with developments in solar cell
| manufacturing, but it is something to bear in mind. Thus, they're
| not usefull as an initial generator, but should be used instead as
| aa replacement source for end-stage power. The City police use
| solar pannels atop their mobile speedcheck unit. saves having to
| hook it up to the city power, or have huge batteries in it.
Something to consider:
1] Given a starting base of (energy expensive) photovoltaics and
suitable location, do you suppose the power generated could be used to
produce successive generations of solar cells _and_ an energy surplus?
2] Since much of the energy required for solar cell production is in
the form of heat, could we improve the silicon production cost
equation with heliostats?
An bonus aside: In the early 70's Research Fellow at IBM came up with
a process for "pulling" reasonably efficient solar cells in ribbon
form (any reasonable width and at speeds measured in m/sec) which
eliminated the requirement to pull and then slice cylinders as is
currently being done. FWIW, any patents that might have resulted from
his work should have expired by now...
If we could just pull together what we already have, I suspect we'd
discover that we already have many of the solutions we need. We just
made the rather ordinary mistake of "putting them away in a safe
place" and forgetting where that was.
DeSoto, Iowa USA
Well I thought about rounding of this thread with a summation not that I am
in any way qualified to do so.
If the photovoltaic cell is a none starter costing more to make than it can
ever generate then my whole suggestion of supplying them to the middle East
is a pipe dream.
But if there are cheap mass production methods tied up in patents then maybe
it's not a total loss.
However in terms of electrolysing water I have been waiting for someone to
bring up the anode depletion problem and as such the cost of replacements.
As far as I can remember anodes still break down with the electron flow,
just like sacrificial anodes are used in electroplating or on ships to
prevent corrosion etc.
So how do they stop this in Brown gas generators as used in this video?
Could you provide the correct spelling of his name?
Robin van Spaandonk
Competition provides the motivation,
Cooperation provides the means.