Questions tagged [wind-power]
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31
questions
0
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1answer
19 views
number of electric vehicles that can be charged with specific amount of energy
I used minutely sampled wind speed data for one year to calculate the yield power from specific wind turbines to be used in electric vehicles charging station.
I am supposed to calculate the number ...
-1
votes
2answers
31 views
What is and how do you calculate the wind velocity design for wind turbines?
I am finding it difficult to get consensus on the definition of design wind speed for aeolic turbines.
I thought it was the velocity that corresponds to the maximum power output, but I have already ...
0
votes
1answer
26 views
small gearbox for experimental wind mill
The gear box will have little torque as I am only using a 12 by 18" wing which rotates. The two shafts I am using are 1/4 ", one form the wing and the other going the to pivot for the wing to circle, ...
1
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0answers
34 views
Conceiving a wind turbine as a thermodynamic machine
Traditionally, and continuing till the present day, wind turbines are conceived/presented as power plants which harvest the (macroscopic) kinetic energy carried by an externally available airflow, ...
1
vote
1answer
31 views
How to estimate wind generation using power curve?
I am trying to verify windfarmer generation estimates manually. To do so I am trying to manually calculate the estimated energy production (kWh) of a wind turbine. The information I have available is ...
2
votes
4answers
118 views
Wind turbines with down tower power units. Why aren't they more common?
Concerning the big megawatt wind turbines, if there is such a big trouble with gearbox bearings failing much earlier than expected and costly maintanence or replacement of huge gearboxes, what is ...
4
votes
2answers
118 views
Do 3 blade wind turbines generate more power than a 9 blade, all else being equal?
After doing some research, I have come to the realization that 3 blade design horizontal turbines have the greatest maximum coefficient of performance. Most sources seem to agree a Cp of ~0.45 at TSR=...
2
votes
1answer
56 views
In horizontal axis wind turbines, why does axial component of absolute velocity stay constant (wake rotation theory)
I am having hard time understanding how does the axial component stay constant through the rotor. Every resource i look just says it is due to mass conservation but never gives the actual conservation ...
1
vote
2answers
65 views
Can a bridge's towers be used as wind turbines?
I come from a fairly remote island where we need a 150 min ferry ride to reach the mainland.
While the island has few resources that would encourage a government to investigate the possibility of a ...
0
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2answers
91 views
Why vertical wind turbine don't be half covered
I think it would be more efficient for a vertical wind turbine to have a covered funnel about half of it
Something like this figure
It would protected the turbine from opposite wind and also ...
1
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0answers
24 views
Hybrid Energy Monitoring Systems
I have been doing research on renewable energy systems and I must admit that I am a newbie in this specific area. I have noticed that stand-alone systems have their own specific monitoring system ...
0
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2answers
57 views
Is it possible to generate energy from indoor draft by opening windows on opposite sides of the building?
Wind flow always generates naturally when I opening windows on the opposite sides of the building.
Is it possible to put turbine on the way and generate electricity from that?
It could be optimising ...
-2
votes
1answer
32 views
How is the Ampyx Power plain generating energy? [closed]
This is what I'm talking about:
Wikipedia
Youtube video 1
Youtube video 2
Official site
Can you please explain me on how this plane is generating energy? Reeling back the aircraft should consume the ...
0
votes
2answers
615 views
what is 1P frequency in rotor (wind turbine)?
In wind turbine, Is the number of revolution taken in 1s is called 1P frequency? If not, is it possible to find the 1P rpm from rpm measured for 1 hour (that is, I have 60 rpm data points from ...
0
votes
3answers
55 views
What determines the cost of the wind turbines?
If there is an 11kW wind turbine, and a 15kW wind turbine. Why is the 15 kw wind turbine more expensive?
I know it seems like a basic question, but what exactly makes it more expensive? Is it only ...
0
votes
3answers
237 views
Wind measure with strain gauge
I'm trying to build my own weatherstation for my home, I want to measure temperature humidity and wind strenght and direction. For the wind I have a question. I want to measure the wind with a ball on ...
1
vote
1answer
51 views
Is it possible to determine tip-speed ratio from rotor geometry?
Let's say I have the geometry of the rotor: the number of blades, the airfoils that make up each blade, their position, chord length and their twist angle. Would it be possible to use this information ...
3
votes
3answers
441 views
Why not design a Wind Turbine like an Anemometer?
Anemometer measures wind speed. It's shaped with little cups---hollow half-spheres. That looks very logical as the cups grab the wind and the other side is rather streamligned to cut through the air ...
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vote
5answers
294 views
Why isn't it possible to build a car moved by wind power?
So, first of all, I am a High School student and I wanted you to explain me something (in a more "concrete" way, if you know what I mean): I had an idea the other day to make a car with a wind turbine ...
5
votes
2answers
2k views
Advantages/Disadvantages of two-bladed windmill?
The vast majority of wind turbines I have ever seen feature 3 blades, as shown here:
Recently while driving through western new York state, however, I passed by several turbines featuring only two ...
0
votes
1answer
211 views
Why did my result show “more blades on turbine = more RPM”?
I placed a normal cooling fan 45cm away from a small turbine generator. i had 3 turbines, one with 4 blades, 8 blades, and 12 blades.
The one with 12 blades always rotated the fastest, even after ...
4
votes
1answer
280 views
Why does my model of a wind turbine show high RPM with low power output?
I am designing a wind turbine to generate 1300 W.
I modeled the output voltage of an AC generator using the following specifics:
Number coil turns = 300.
Copper wire gauge = 1.02 mm.
Knowing the ...
11
votes
1answer
1k views
How to calculate Power of motor when used as a generator?
How can you calculate how much power can be generated by a motor when used as a generator (like a motor used in a wind turbine)?
Does the power depend on how fast the magnet is rotated? If so, is ...
9
votes
2answers
619 views
Why don't we just build a giant wind turbine?
The power generated by a wind turbine is given by:
$$\mathrm{Power} = \frac{1}{2}C\rho AV^3$$
Where:
$\rho = \text{Air density}$
$C = \text{Coefficient of performance}$
$A = \text{Frontal area}$
$V ...
-2
votes
1answer
116 views
What theoretical efficiencies can wind / hydro turbines achieve? [closed]
The high water has some energy E = mgh. In the basic school, we were told that hydropower plants extract the energy of "falling water". Now, that banned principle says that if your water falls upon ...
4
votes
2answers
3k views
Relationship between wind velocity, turbine rotor diameter, and power output
I'm trying to understand and identify the equations to use in defining the relationship between wind velocity, turbine rotor diameter, and power output for a wind turbine.
To simplify my question, ...
3
votes
1answer
152 views
What is the power and max flow rate required to rotate a 300 W wind turbine?
I have purchased a wind turbine with a power of 300 W, the start up wind speed is 2.5 m/s, rated wind speed is 11 m/s, and the survival wind speed is 45 m/s, and what I'm going to do is to make an ...
4
votes
2answers
514 views
Efficient 3D mesh topology for CFD simulation of turbine blade
I´m developing a tool to generate an openFoam wind tunnel case of a wind turbine. I already have the blade geometry constructed, but I'm really new to CFD and parametric meshing. I found some ...
6
votes
1answer
82 views
To what degree are wind and water turbines exchangeable?
Assuming maximum efficiency is not the primary concern (but net positive efficiency is), to what extent could a wind turbine operate in water and vice versa?
How do the different turbine types fare ...
5
votes
2answers
278 views
Identifying category of wind turbine
I recently saw a wind turbine that I'm trying to identify the type or category of.
Basically, the turbine looks like two squirrel cage fans mounted side by side on a fairly tall ~40' pole.
The ...
13
votes
2answers
256 views
How to correctly size the blades for a small educational wind turbine?
I want to design a small wind turbine that can be easily carried out of the classroom into the sports field in relatively low-wind conditions (5-15km/h) that can power a small ultra-bright 5V LED - ...
