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Posted by Joe Fischer on April 8, 2007, 10:19 pm
 
On Sun, 08 Apr 2007 21:10:42 +0100, Eeyore


           Of course, if you don't observe daylight savings time.

            All of the posts except Bill's arrive here early.

Joe Fischer


Posted by Eeyore on April 8, 2007, 7:53 am
 


Hysterical leftwing global warmers must DIE wrote:


Rubbish. Wind turbines come sizes up to 2MW these days and 5MW wind turbines are
in the pipeline.

Graham


Posted by Erdemal on April 8, 2007, 9:24 am
 Eeyore wrote:


are

2 MW at what wind speed?

I checked and found it is at 15 m/s (= 54 km/h = 33 mph).
http://www.vestas.com/vestas/global/en/Products/Wind_turbines/V80_2_0.htm

The power of wind varies as the cube of speed so:

54 km/h  >  2 MW
25 km/h  >  0.250 MW
12 km/h  >  0.030 MW   (0kW)

12 km/h is rather the average wind speed than 54 km/h!

There too, the investor part of the site is larger than the technical part.

Erdy

Posted by Eeyore on April 8, 2007, 10:53 am
 

Erdemal wrote:


turbines are

Where ?



This size of turbine is probably most suited to offshore wind farms.

Graham


Posted by Eeyore on April 8, 2007, 11:03 am
 

Erdemal wrote:


Says who ?



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

Vestas V90-3MW. Looks more like square law to me which is what I'd expect.

15 m/s  >  3MW          That's your 54 kph
10 m/s  >  1.6MW
7.5 m/s  > 750kW        27 kph
5 m/s     > 250kW  (close to the cut in speed)


Graham


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