Re: Re: Modern Home Servers - Power Savings

[Jim Noble <yahoo-groups@xxxxxxxxxxxxxxxxxx>]

Slavo wrote:
> Did you have a look at this turbine?
> http://www.quietrevolution.co.uk/
<http://www.quietrevolution.co.uk/>
> It looks quite interesting. Completetely different concept.
>
From their website:
> Illustrative Payback Period:
> Average Wind Speed    5.9m/s
> Annual energy generated (kWh)    10,000
> Price for energy offset    9p
> Price for ROCs    4.7p
> Inflation in energy prices    5%
> Annual value generated    £2,108
> QR price    £25,000
> Installation cost    £8000
> Total cost    £33,000
> Payback period    18 years
> Assumptions:
> 5.9m/s - On medium rise building tops or exposed sites
> 10,000 - (XC02 calculations)
> 9p - Average green energy price
> 4.7p - Today's value from Platts ROC Marker
> 5% - Predicted energy price increases
> Source: DTI and UBS
> £2,108 - Energy offset & ROCs incl. forecast inflation
> £25,000 - Single 6kW turbine, 5m high x3.1m diameter
> £8,000 - Estimate only, not including mounting/foundations.

Not many places have an average windspeed of 5.9m/s (*).  Even if you
find somewhere that does, most of the time it'll be below the 4m/s
minimum wind speed for any significant generation to take place. (10,000
kWh per year would require it to produce its max output (6kw) ~20% of
the time...)

It spins much quicker than traditional wind turbines so will probably be
noisier (not that modern wind turbines are all that noisy - wlsewhere on
their website they state 56dBA at 20m, which is certainly noisier than
some...)

18 years is one hell of a payback period. Would it even still be working
by then?

(*) Maybe if you mount it 25m above ground level:
http://www.bwea.com/images/misc/noabl_c.gif

I think I'll pass :-)

Jim

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