Posted by adm on January 19, 2007, 10:01 am
>>
>> Looking at your picture, I'd say your turbine is way too close to roof
>> height to get decent output. See if you can get it 5m
>> higher up so it's well out of turbulence from the roof line, then see how
>> the power output is.
> You are correct in what you say but I don't think I can do that.
> First of all the neighbours would probably raise hell at the intrusion
> into their view.
> Secondly the wall isn't strong enough to hold the stress produced by
> another five meters of height. The greater the height of the
> pole, the more stress on the mounting points.
> I agree that it is too close to the roof level but I can't change that,
> this is why I was thinking of a bigger turbine.
> Do you have a turbine?
Not right now as we've just moved into a new house and I am in the process
of gaining Planning Permission for a 15m tower that will carry a 3kW turbine
(we live in the country with no close neighbours) . I'm an importer and
installer of PV solar panels and am thinking of also supplying and fitting
wind turbines (although not urban roof mounted ones) so have been doing a
fair bit of research into them lately.
I'd recommend that you go here:
http://www.scoraigwind.com/rooftop.html
and read what Hugh Piggott has to say on urban wind turbines - he's well
respected in the field and has his head screwed on right.
Unfortunately, I think you are correct in what you say about your neighbours
and the structural stregth of the building. My opinion is that to make small
wind systems viable, they need to be mounted well clear of all obstructions
and in a good clean airflow. Realistically, this means on a tower in most
cases, which makes them unsuitable for many town and city dwellers.
Personally, I don't think using a bigger turbine will give you much
benefit - you will still have the same wind resource and it seems that
there's not enough to give you the maximum benefit of the turbine you
already have.
>
Posted by tg on January 19, 2007, 11:45 am
> Not right now as we've just moved into a new house and I am in the process of
gaining Planning Permission for a 15m tower that
> will carry a 3kW turbine
that sounds good. Any chance of seeing some pics when it's up and running?
Posted by adm on January 20, 2007, 4:10 pm
>> Not right now as we've just moved into a new house and I am in the
>> process of gaining Planning Permission for a 15m tower that will carry a
>> 3kW turbine
> that sounds good. Any chance of seeing some pics when it's up and running?
For sure.
Posted by tg on January 20, 2007, 6:08 pm
>>
>>
>>> Not right now as we've just moved into a new house and I am in the process
of gaining Planning Permission for a 15m tower that
>>> will carry a 3kW turbine
>>
>> that sounds good. Any chance of seeing some pics when it's up and running?
> For sure.
okay, make a note of my email addy: tonj at freeuk dot com. Please let me know
when you've got pics. Thanks.
Posted by wmbjk on January 19, 2007, 6:41 pm
>Personally, I don't think using a bigger turbine will give you much
>benefit - you will still have the same wind resource and it seems that
>there's not enough to give you the maximum benefit of the turbine you
>already have.
I disagree. If he doubles the swept area, he can reasonably expect
about double the output, no matter the location. If it were me, I
think I'd also add a telescoping section to the pole, and raise the
turbine incrementally to either the structural limit, or until
somebody complains. ;-)
Wayne
>> Looking at your picture, I'd say your turbine is way too close to roof
>> height to get decent output. See if you can get it 5m
>> higher up so it's well out of turbulence from the roof line, then see how
>> the power output is.
> You are correct in what you say but I don't think I can do that.
> First of all the neighbours would probably raise hell at the intrusion
> into their view.
> Secondly the wall isn't strong enough to hold the stress produced by
> another five meters of height. The greater the height of the
> pole, the more stress on the mounting points.
> I agree that it is too close to the roof level but I can't change that,
> this is why I was thinking of a bigger turbine.
> Do you have a turbine?