B
BradGuth
- Jan 1, 1970
- 0
In sci.physics,BradGuth
<[email protected]>
wrote
The only problem is that those solar cells cast a shadow. Is there
anything nearby? Oh, another tower? Won't do that other tower
much good, will it?
Oops.
If one likes shade.
There's only one, numbnutz. Unless you want to claim I have multiple
personalities. (Maybe I do. Depends on my mood. You can't tell.)
How many hectares of land (1 hectare = 2.47 acres or 10000 m^2) would
it require, even assuming your 40 kW/m^2?
And how much would that land cost?
Also, the current power utilization of the US is about 4
trillion kWh/year, or 456 gigawatts. Oil consumption is
about 20.73 million bbl/day, or 1.46 terawatts (since 1
barrel of oil is about 6.1 gigaJoules).
The good you've got enough power.
The bad it'll cost.
Highly debatable, mostly because PV fab costs are relatively high.
They are, however, coming down to the point where ROI thereon
might be 5 years, if one is lucky.
Also, there's still the shadow issue. A 100 m high tower
is going to cast at least a 100 m shadow. This will more
than double the acreage requirement ... and may quadruple
it, depending on how much usable sunlight one wishes over
the course of a day.
A renewable energy farm of such tower derived clean energy may be as
few as one. Then there's offshore installations. Go figure.
A naive calculation, taking into account the shadow
problem, suggests about 400 megahectares, or 1.5 million
square miles. This is more than twice the size of the
state of Alaska.
We could all use a little extra shade. Global warming, you know.
That would be quite a facility, and be readily visible from
space.
$1e13 is about the yearly GDP of the entire US at present.
You have written your Congressperson with this proposal, right?
Obviously you have no honest intentions of polishing or otherwise
constructively contributing squat, much less pitching on our behalf.
Of course neither would the likes of your friend GW Bush, but I'd bet
Hitler would, especially if it meant winning a war, such as our war
against global warming and otherwise salvaging our badly failing
environment.
In that case, we'll just run our cars, SUVs, trucks and most
everything else under the sun that's orbiting your flat Earth on nasty
old coal and mostly N2, just the way "The Ghost In The Machine", ENRON
and the ExxonMobil swarm of denial and naysayers like it.
- Brad Guth -