Total area of land to power the world with solar energy - Page 7

 Eeyore wrote:

I say :)

Power of a moving fluid
-----------------------
        kinetic energy        m * v * v / 2
        mass per second       m = v * area * density

        P = k * v * v * v         (= cube)

        m mass, v = speed, P = power

You could argue too that average wind speed is much higher
at 60 meter height that at ground level.


http://www.vestas.com/NR/rdonlyres/662F8438-D741-4128-80A8-B0E72FAB7697/0/V90_3_UK.pdf

The fan is very probably optimized for a lower speed?

I just want to point out that the annouced power was for
a 'high' wind speed. It's true too that my approximation
was not fair :)

Erdy

  On 7 Apr, 23:07, "Hysterical leftwing global warmers must DIE"

40,000 x 5 MW x 40% = 80 GW.

That's enough electricity for 80 million people. Throw in electric
transport and heating, and you could probably do a City of 30
million.

Medium sized?

 
simple_language@yahoo.com wrote:
http://www.ez2c.de/ml/solar_land_area/

 On 7 Apr 2007 14:30:57 -0700, "simple_language@yahoo.com"


You used  PV technology for you projections. For centralized power
generation, solar thermal technology is much better : higer effiency
(more the 20%, reducing the needed area by almost a factor 3),
cheaper, using only conventionnal technology and not needing rare
materials.

 No one solution will be the answer. When the sun doesn't shine, you
have a problem. We need many duplicate systems to cut down on fossil
fuel consumption so we have it when the sun doesn't shine and the wind
doesn't blow and the hydrogen mines close down.