battery-less VAWT [RE-wrenches]

[Wilco Vercoelen]

Dear Kelly,

You are absolutely right. Rooftops in general are not recommended, because
of turbulence, vibration etc, etc. and there isn't a lot of wind at these
heights anyway, however the price per kwh produced is lower because no tower
is required reducing the overal installation costs. Producing about 55% of a
Skystream, installed at 10m, but half the price installed could still be an
interesting option for some applications. Like I said, we think it has its
own little place in the market. It will be limited and more actual field
data must be provided.
The single most important issue is the SWCC certification in place for the
small wind turbine market and get rid off all the phoney stuff.

Wilco Vercoelen
Dommelvalley Green Power
Utopia, Ontario


-----Original Message-----
From: Kelly Keilwitz [mailto:kelly at whidbeysunwind.com] 
Sent: February 4, 2008 1:21 AM
To: RE-wrenches at topica.com
Subject: Re: battery-less VAWT [RE-wrenches]


Wilco,
I wasn't aware of this outfit, thanks. Their "testing" facility in Kelowna,
BC is ~ 5 hours from us - in fact I was through there last week.

However, the first availability was stated as August, 2007 and they're
marketing it as roof-top mounted. I'd like to know that one of those 300-lb,
64 s.f. spinning objects has stayed up and operational on someone's roof (in
a windy spot) for a few years before I recommend it to a customer.

Rooftop mounting, even if the turbine stays up, and doesn't vibrate, still
is missing the main point: there just isn't much fuel there. The cost of a
tower can be justified simply by Energy ~= velocity cubed.

-Kelly
Kelly Keilwitz, P.E.
Whidbey Sun & Wind, LLC
Renewable Energy Systems
NABCEP Certified PV Installer
987 Wanamaker Rd, 
Coupeville, WA 98239
PH & FAX 360-678-7131
sunwind at whidbeysunwind.com



On 2/1/08 8:51 PM, "Wilco Vercoelen" <w.vercoelen at dommelvalley.ca> wrote:

> 
> 
> Have you guys looked at Windterra http://www.windterra.com/
> It is a fairly new Canadian 1.2kW direct grid-tie VAWT, but based on the
> specs and pricing we think it has its own place in the market. We do not
see
> it as an alternative to a horizontal wind turbine but rather as a type
that
> can be used under certain circumstances, e.g. higher rise buildings.
> We know that for example the Dutch Grid-Tie Turby (European market) is
> pretty effective and well developed, but again in its own little place in
> the market. We believe that the majority of turbines will be horizontal,
now
> and in the future, but that doesn't mean that a well-tested vertical
turbine
> with actual good field test results and certifications can be a solution
> under certain conditions. Unfortunately there aren't many out there,
yet....
> 
> Wilco Vercoelen
> Dommelvalley Green Power
> Utopia, Ontario
> 


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