Energy self-sufficiency - Offers

Yes, the loss is greater, but it is usually feasible in every residential area. With such a classic wind turbine, the neighbor climbs up on the roof along with the installer.

And what is technically possible or what loads are involved probably depends heavily on the individual conditions on site. I could imagine simply placing something like that decoupled on the flat roof, without a mast.

Whether it is worth it... as always, a calculation exercise.

I think I read about half a year ago that a wind turbine for power generation is not allowed on a roof. At the time, I found the idea very interesting. As far as I know, it must be stand-alone. If it is allowed on the roof after all, you definitely have to plan for reinforced anchoring so that the wind turbine doesn't tear off half the house during a storm.

Hi,

to be honest: I do not know exactly. In Wuppertal, in the model house park, there is, as mentioned, a house with such a wind turbine. The latest technologies are installed there, all with photovoltaics, houses networked with each other, and so on.

Although one should actually say it is a wind spiral, not a real wind turbine. It looks more like a "huge candle lamp consisting of helical blades." The device is mounted on the roof.

As far as I know, these houses – model park or not – are built according to regulations.

Since this topic still bothers me (with_or_without_money ;)), I have wanted to drive to the model house park again for a long time and talk to the people from this house about the subject. Due to my accident in January, I neither had the time nor the inclination. As soon as I learn details (type, kind, performance, costs, statics, lifespan, approval procedures), I will post them here in the forum.

Best regards
Thorsten

Sounds a lot like those aforementioned vertical rotors. With this "spiral," they probably installed the least powerful element (as I have read).
From my point of view, it would be interesting to know to what extent the roof/rafters had to be reinforced and how the fixation within the house was carried out. For example, does a concrete ceiling for the upper floor need to be planned? Is installation/fixation possible on the "usual" wooden floors/wooden ceilings? How are vibrations and potentially increased pressure caused by wind absorbed?

Take the questions with you in case you manage to get to the model house park after all. ;)

Hi f-pNo!

Such a thing doesn’t produce much power - I suspect: P_Max = 1kW.

Here with me in this kite-flying wind corridor it would make a difference, as I said, I suspect I would have a solid yield with it. Because little things add up to a lot in the long run.....

I *suspect* that with this vertical/spiral design the horizontal forces and vibrations occurring would be noticeably lower compared to a conventional wind turbine. And I think that such a toy doesn’t need any significant reinforcements. The wind loads on a wall and the roof are definitely much higher than the forces such a spiral generates. The loads on the chimney are probably huge in comparison. And also the satellite dish..... the tugging from the thermal collectors and the photovoltaic as well....

I make a note of your questions and take them with me. Maybe I’ll manage to get to the model house park next week during the bridge day, I have planned it.

Of course, you will get information from me as soon as I find something out. I am really curious myself what I find out, how it will turn out.

Best regards
Thorsten

I *suspect* that in this vertical/spiral construction the occurring horizontal forces and vibrations are likely to be noticeably lower compared to a conventional wind turbine. And I think that no significant reinforcements are needed for such a toy. The wind loads on a wall and on the roof are definitely much higher than the forces generated by such a spiral. The loads on the chimney are probably huge in comparison. And also the satellite dish... the strain from the thermal collectors and the photovoltaics as well....

According to a homepage dealing with small wind turbines (Google), the disadvantages compared to a horizontal system are: Lower efficiency A significant disadvantage of vertical small wind turbines lies in the lower efficiency. While horizontal systems have achieved a so-called specific power output of up to 50%, the value for vertical rotors is at a maximum of 40%. Horizontal systems often produce significantly more electricity than vertical systems. Lower economic efficiency From the lower efficiency and low electricity yields, the most serious disadvantage can be derived: The costs per kilowatt-hour of electricity produced by wind energy are generally considerably higher for vertical wind turbines than for horizontal wind turbines. High vibrations and loads Vertical systems can cause strong resonances. Low construction height Due to disadvantageous vibrations, the rotors are located near the ground. Horizontal wind turbines can reach higher air layers by means of a mast or tower.

However, I would not necessarily consider the mentioned disadvantage "low construction height" to be a disadvantage within a residential area.

Who needs more than 1kWp anyway?

If such a system constantly runs at 1/3 of the capacity, it covers the entire demand of our base load, and we are not economical when it comes to standby, refrigerator, and continuous consumers.