Micro wind turbines, wind energy

[bham]

the smallest unit is 8 turbines and costs 160 Euro (without transport).
otherwise the second is 20 turbines and costs 280 Euro (st).
you can order directly on the site at:
http://store.motorwavegroup.com

The price is tempting but what can we expect to cover electrical needs, of a unit of 20 turbines for example?
-Can we make an equivalent on the surface of photovoltaic panels?
-20 turbines, that equates to how many m2?
-This requires a set of batteries behind?
-To reinject on the EDF network, must it be installed?
-If we install this on the roof ridge, won't vibrations or noises spread through the frame?
-What is the difference with or without an aluminum chassis? I see that we have 125w and without we have 170w in 10m / s wind

[Gambarota]

Hello

20 turbines = 1 m2 on the surface = 15 W for 5m / s or 42 W for 7m / s or 125 W for 10m / s.
the power of a turbine is exponential (wind speed).
if the wind speed doubles the power generated is multiplied by 8.

the wind industry always gives the capacities for winds of 10 or 12 or even 15 m / s so so that the comparisons can be done I also give the power for 10 m / s (knowing that it is extremely rare).

20 turbines produce per day for 5m / s around 0.35 kWh.
according to the consumption of each one just divide it by 0.35 to calculate the number of necessary turbines.
0.35 kWh corresponds to recharging a 12V 35 Amph car battery.
with 0.35kWh you can light 16 fluorescent tubes for 1 hour. or 1 fluorescent tube for 16 hours.

0.35 kWh corresponds to 160 g of CO2 per day.

the micro turbines are always in pairs because they rotate in the opposite direction eliminating the vibrations.

I refuse to connect the micro turbines on the network because the goal is not to relieve the local EDF but that each begins
to reduce its consumption and by managing its daily production of electricity one tends to extinguish the non useful lights and not to put the heating or conditioned air if it is not necessary.
those who want to connect can do so by
purchasing a modulator approved by local EDFs.

there are several types of framework depending on the geographic location. by the sea you need stainless steel elsewhere aluminum is sufficient (the performance does not change and the difference you found is an error on our part, sorry for that).

In France you are not too affected by pollution but here in Hong Kong we spend 1.5 billion Euros per year just in medical costs and therefore it is a necessity to do something.
performance or cost becomes secondary.

despite this today micro turbines are by far the most economical system.
it is considered to cost around 20 to 30 Euro per W for solar panels.
around 10 to 15 Euro for classic wind turbines
around 1 to 3 euro for micro turbines.
without forgetting that the installation costs are also different.

in terms of philosophy you have to consider this.
1 kg of oil if burned will generate 4.5 kWh of electricity (one time + 2.5 kg of CO2).
1 kg of oil if it is transformed into plastic will produce a turbine.
a turbine can produce 1 kWh in 4.5 month.
a turbine can be recycled and will generate 1000 times more energy during its lifetime by never releasing CO2.

Regards

[Obelix]

Hello,

I pushed my investigations a little further on the microturbines!
Good it is a mechanical coupling between the various turbines and at the end of the chain a generator!
This should generate noise and lower the output!
the pod of 8 turbines is given for 50W at 10m / s of wind!
Bof is not terrible barely 10% of output (a tri-blade is in the 35% with equal swept surface)
Then modularity: it is in rows of 8 or 20 turbines it is not ideal either !!

The idea is very good, the realization much less!
For me the ideal would be a single microturbine with its built-in generator, like a PC fan mounted in a generator.
Cheap considering the price of pc fans! Improved performance! Parallel mounting to reach the desired power .....

Obelix

[Gambarota]

Hi wise guy.

??????????????
the yield is 44.25% in tunnel and 26% in live situation because of the structure of the unstable wind.
just at the limit of betz law and the efficiency of a generator.
efficiency being the energy collected / the kinetic energy available.
already elected after 37 weeks the XNUMXth best technology
by Peswiki.

a three blade has only 20% efficiency in most wind farms (efficiency being in this case the actual production / theoretical production). Here in Hong Kong the only three blade has an efficiency of 13.5%.
the efficiency of micro turbines is more than 90%.

without wanting to give you advice try to get 15 watts from the square meter with winds of 5 m / sa 1 or 2 Euros and at an industrial level of course.
you can start tinkering.

[Obelix]

Hi wise guy.

??????????????
the yield is 44.25% in tunnel and 26% in live situation because of the structure of the unstable wind.
just at the limit of betz law and the efficiency of a generator.
efficiency being the energy collected / the kinetic energy available.
already elected after 37 weeks the XNUMXth best technology
by Peswiki.

a three blade has only 20% efficiency in most wind farms (efficiency being in this case the actual production / theoretical production). Here in Hong Kong the only three blade has an efficiency of 13.5%.
the efficiency of micro turbines is more than 90%.

without wanting to give you advice try to get 15 watts from the square meter with winds of 5 m / sa 1 or 2 Euros and at an industrial level of course.
you can start tinkering.

Hello,

We should not talk about the same thing !!
On your site the pod of 8 turbines is given for 50 Watts!
.25m diameter turbine
Area = PI x diam x diam / 4 = 3.14159 * 0.25 * 0.25 / 4 = 0.049 M²
8 turbines = 0.396 M²
Wind 10 m / s kinetic energy available: E = 0.5 xmx S x V x V x V
with m air mass, S swept area, V Wind speed in M ​​/ s
E = 0.5 * 1.225 * 0.396 * 10 * 10 * 10 = 242.55 Joules / second or 242.55 Watts
Energy available according to your site 50W or a return of 50 / 242.55 = 0.206 or very close to 20%

Sorry but I don't see where the difference is gone !!

Obelix

[Gambarota]

you have already doubled the power. it is already better. a little rigor does not hurt. it is the beauty of the internet nothing goes unnoticed.

in the lab we measured a very beautiful exponential
P = 1/2 x 1 (air density in dry tunnel) x 0.4 m2 xv ^ 3 x 0.4425.
the power being measured with a variable "load" until the best result is found.
betz gives us 59% max x 75% efficiency for a generator that gives: 44.25%. = almost perfect system.


in real users will not be able to constantly search for the best scenario and by recharging a battery we are limited to multiples of 12 volts which is why I am announcing an efficiency of 26% to avoid possible arguments. it's that simple.

I would also like to correct you: the wind turbine manufacturers almost all advertise an efficiency of 44% and not 35%.
one can also wonder about the veracity of this figure since there is no tunnel capable of testing a turbine of 50 meters or 100 meters in diameter.

from a point of view of principle you make a mistake of appreciation
(which by the way everyone does) thinking that because of the gear there is friction and therefore loss.
Unlike a gearbox where each pinion only transfers the energy from the first pinion to another and where there is about 5% loss, each micro turbine has its own energy and in fact increases the rotational speed of the assembly.
there is naturally a limit that is why I limited the number of turbines to 20.
the turbines placed in lines is explained by the fact that the system can be installed very low on a roof and therefore with a very low resistance on the structure and more the wind arrives in horizontal layers and not vertical.

I spent 3 months in Lab to establish and verify the theory.
There is even a thesis that is being written on the subject.
having done all the steps myself from conception to manufacturing, I am inexhaustible on the subject.

Regards

[Obelix]

Hello,

And thank you!
It's still good to chat with someone who "knows".
Indeed the concept is very interesting especially for integration into the site!
The yield is acceptable in view of the integration facilities, in any case better than with a machine several meters in diameter!
Thank you for all these details and encourage you to continue on this path !!

Obelix

[toto65]

I had a question / suggestion.
Instead of normal gears,
could you use magnetic gears?

It was just an idea like that.

[nofy]

Good evening Gambarota,

Too bad your site is not in French.

We have a project for Madagascar, with a daily consumption of 20000 w.
Can you in MP contact me?

Nofy (dream)

[gaeldk]

Mr. Gambarota,

What a pleasant surprise tonight to read all the answers about me and especially your answers!

I live in Denmark where there is a lot of wind and I want to power, a (or 2) 100W lamp for 6 to 8 hours a day. So a consumption of 0,6 to 0,8 kWh / day.

What setup do you recommend?
Can you ship from the EEC because if you order on your site the material comes from HK and have to pay an import and customs tax?