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re: frugal job skills?
25 jul 2001
george l ghio wrote:
>as i thought you have not "built" anything.
>try it from the design through to finished product.
do you make pv cells and batteries and inverters in your basement? :-)
former new jersey governor byrne used to say his press relations were
so bad that if he walked across the delaware river, the next-day's
headline would be "byrne can't swim!"
> > you might think of a square foot of greenhouse as a pv panel that
> > collects solar heat at $0.01 per peak watt :-)
we (not you, george) might approach this with pvs (and collect lots
of heat) using an optical mixer (a refractive shoebox that works like
an integrating sphere) as described in roland winston's ases 2001 paper
"nonimaging solar concentrator with uniform irradiance":
there are two principal pathways to efficient photovoltaic conversion
of solar energy to electricity; low cost cells operated at ambient
solar flux and higher cost cells operated with concentrated solar flux.
the latter application imposes a requirement on the concentrator
that is specific to photovoltaic applications; the irradiance on
the cell array needs to be quite uniform. this is because non-uniform
irradiance degrades the electrical performance thereby reducing
conversion efficiency...
the goal for the design is to achieve an irradiance uniformity on
the target (the solar cell array) of better than +/-5%... the desired
flux concentration is in the 100 to 500 times ambient insolation
range... [and] higher concentration ratios, up to about 2000x...
nick
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