This was a very clear explanation of wind physics. Thank you for putting it out here as a public resource!

Being a mechanical engineering,I understood the fundamental formula and found the best of best video till date,,I have watched more than 200 videos, but none was able to provide me the fundamental details,, You cleared all my doubts in this single video,and helped me save my money because I was seriously considering to install few small vertical axis turbine on my factory building,, as an substitute to solar panels,,but my place is not so suitable for proper functioning,, So, thanks a lot for such a great video,, I have subscribed your channel,,👍👍👍👍

Very well done, congratulations and thank you. We need far more University scientific wind courses like this! from RH Henkle large wind energy professional.

Thank you for very interesting thoughts and discussions, very helpful for my PhD studies in foundation engineering

Fantastic info mate. Exactly what I was looking for

THAT, was well done. You included issues that other wind turbine vids haven't even touched on.

Excellent lecture! Clear and easy to understand!

Excellent video, very well explained. Thank you for making it.

Straightforward explanation, thank you !

great, giving practical examples of good and bad selections

What if you redirected man made wind to impact only the tip of the blade extensions perpendicularly and those blades were riding in a vortex? I am seeking a formula for efficiency in a prototype design where Betz's limit does not apply.

What is the up to date take on wind turbine tail feather ? Buy the way thank you for the informative post , Where I now live is to become wind farm central , with 34 turbines around 200 meters blade tip height . Closest about 250 meters away but all within 9 k`s .

How about cluster of smaller turbines (for ex. 500w), will they work for let say 2-5kW use? Probably again same problem of turbulence and all that right? Is turbulence same from vertical or horizontal turbine? And some additional question, if somebody knows: is there some use of wind and solar together for more efficient energy use for home (maybe even with on-grid system)?

Thank you so much , it was a simple and clear explanation.

Can I use the same formula for a vertical axis water turbine? Is it just as simple as replacing the density of air by the density of water?

Can you estimate the diameter of a wind turbine foundation by considering its rotor diameter and tower height? I am thinking about a gravity based foundation.. I once spoke to a wind guy and he told me it is possible to calculate and then he left off.

What about the ratio between the coils and neodium magnets and blade size

This is an example of an objective and clear explanation.

Excellent explanation for basics. Thank you. I am now trying to find the extension of the energy calculations which includes losses.

Holy crap at 7:38 you became briefly possessed by Yoda

Fantastic presentation!

A very helpful video. Thanks a lot.

It's interesting to see different realities expressing one's interpretation based on one's limited frame of reference.

Very good presentation. Thanks to Nebraska.

what are the risk factor if i placed a turbine on building

THANK YOU FOR YOUR VIDEO. Can I make a few small turbines and connect them to a controller and save them into a battery. All I need is to make 1200W and how many turbines do I need and the smallest in size can accomplish it.

Can someone please explain why a house-wind-turbine looses efficiency (slows down) when energy demand is increased (ie: a microwave is used?). What is that called? Thanks.

Have agood day I have a question I hope that I find you have response your capacity as specialized in the wind turbines . If the wind power that runs the blades for example, 100 hp , or 100 Newton the number of cycles entering into gearbok and then to the generator fixed and stable the output electric current good and stable in terms of voltages , ampere .. the question here ,The amount of energy entering the gearbox and then to the generator of 100 horsepower or 100 Newton how much horsepower or newton Newton will come out net of the generator representative of electricity after calculate factor friction and heat intersection magnetic fields in the generator . I hope to answer my question with thank ..

I have a question, preceeded by some explanation of how I understand the technology. Which could be wrong... I've looked at the technical data sheets of several wind turbines, from 10kW up through 3mW. As I understand it, wind turbines (small and large) don't produce full power until the wind is about 25mph. At half speed 12.5mph they output about 1/8th power (12.5%) and at 9mph their output is zero. I called a decent sized wind farm here in the midwest and the manager was quite nice and fairly transparent. Of course their website stated the benifit of the site at 100% output, but after some prodding, the manager conceded that the output was much less, putting it at 10% to 13%. My question: I've done some back of napkin calculations on smaller turbines (which I can get prices on) and with the price of equipment, and installation, I can't see any way to make the smaller ones pay for themselves, even at the retail cost of power. Assuming the cost per kw is fairly linear for land based turbines, of which I'm unsure; I then consider the viability of commercial wind farms. Once you add in land cost, maintenance, insurance, taxes, and management costs, how is it possible for wind to be a cost effective technology? Financially, it just seems untenable. Am I off?

Where does the number of blades factor into the equation(s) ?

Interesting video. I'm building my own windturbine including the generator but I was initially planning to set it up on a roof. But I know I should'nt do that. It's also more complicated and dangerous to install it by yourself on a roof of a traditional house. Put the wind turbine on a tower is easyer to do. Thanks.

Thanks so much, really good thorough explanation.

good explanation, thanks

i liked the demontration, how to simulate the power of the wind turbine using matlab?

EXCELENTE EXPLICACION.

at 15:31 when the direction of wind changes how do you move the trubine ? do you use a motor to move this or is there a better way to do it?

Very Good Explanation.

Do the thickness and width of a blade affect in any way the efficiency of a turbine? I see that only the swept area is taken into account (height and rotor diameter). What if the blade is too thin and narrow?

Thank you, awesome

I love this video helped me on a project im working on

There is a way to make the Darieus windturbine more usefull. The vertical windturbine has a disadvantage in the southern oceaans that the Darieus can solve. Use the Darieus on its V3 with producing H2. The Darieus has the advantage of a more easy way of adding turbines, when windspeeds go up. Use the more Kg with higher windspeeds forces to pull more turbines at a equal speed, so no brakes or shud downs are needed when storm windforces arrive, you just let the Darieus spin more turbines. 1 big on vertical vs 4 to 8 smaller, depending on windforce. On the vertical windblades higher speeds will stress the material more by its centrifugal force on big turbines and using brakes or shut them down is a waste of energie. When bild well, you can use a part of the energie for electric magnetism to let it hoover so there is less fricktion, but a faillure in that system could make the whole turbine crash. I'ff you create a bigger vacuum behind the blades, will the drag increase or decrease? I mean... High pressure tent to flow to low pressure, does it not? ;0)

Excellent lecture.I would have also liked a bit of information about i) the blade shape and pitch, ii) whether a gearing is generally advantageous and iii) some mention of ideal generator - but I guess the latter two points do not fall under the scope of the title. Having said that, I think most people (myself included) tend to put too much emphasis on these topics and not enough on the wind power aspects that are very clearly laid out in the lecture. I, like others, had to learn the proportionality of power to the cube of the wind speed the hard way. I kept redesigning in the vain attempt to get more power from low wind speeds - where there simply is no significant power to be attained :-(

You said regardless the 3 the power is what it is. What if there was a 4th option? I found one.

Hello, what is unit of time of watt/m2? at 2:25? graphic shows we can get approx 900 watt at 12 m/s with 1 m2. is it in one turn or 1 minute or 1 hour or 1 year? and how many turns? thanks for your answer.

mean while a set of flat blades set on common shaft 45 degrees opposing its opposite half can and will produce infinite values

There is something wrong with Betz limit if kinetic energy in the wind is 1/2 mass then where can the Betz 0.926% come from regards Graham Flowers MEng

Thank you for informing us about wind turbans.

In wind turbine in which all areas we can design it

Who taught this video? I would like to reach out to him by email?

please post some wind energy conversion system solved problem

13:48 "Shrouded Turbines" are probably an extension of "Ducted Fans"

Nice work thanks

Thank you, very helpful video sir.

I'm working on college project. Following your formula I've work out that my wind turbine can produce 15.7 watts. Power in the wind (Watts) (p)= 1/(2 ) 𝑝A 𝑣^3 𝑝 = Density of Air = 1.2 kg/ 𝑀^3 V = Velocity = 7 m/s A = Area = 2 π X r X h = (2)(π)(1)(.3) =1.9 𝑀^3 P = (1/(2 ))(1.2)(1.9 x 2)(7) = 15.96 Watts Does that mean 15.96 watts a second ? so to work out my out my power out for the day would 15.7 x 60 x 60 x 24 / 1000 would that give me kilowatt hours seem like a very big number ?

Hej, great video. Does anybody know the name of the person talking, need that for school...

air synergy etc make more power in low winds

Greattt

Why savonious are designed vertical instead of horizontal?

perfect

Really Helpful .. Thx too much ..

But the most eficient for low wind speed you have some experince? On Highway in the midle at least in Europe when are smaller wich one of vertical tourbine is better Savonious o Darrieus? Take in mind the wind is produces only by cars when passin close to it. Max speed 120km/h of the car maybe can produce 10km/h of wind speed

I have a question about the formula: P = pAV^3 if we only look at how this formula affects horizontal axes turbines then we will only get an answer about that one type of turbine, but can't we apply this formula to turbines in general? If we do apply this formula to all turbines it would seem that the larger the Area of the turbine the greater the power generated, therefore, it seems to me that of all 3 types of turbines the Savonious has the larger swept surface area and therefore makes more potential energy. Please correct me if I am wrong. The way I see it the larger the sail on the boat the faster it will go.

very good thank you

¿Is it true that Vertical Axis Wind Turbines these Vertical Axis Wind Turbines are more stable in high speed winds than horizontal turbines and safer for animals like birds and bats?

I have a question, Why is there 1/2 in the equation ?

Betz limits ? based on wind/hydro energy losses between the blades A Phyics Law.set in in the oil promotion era 1919. Claiming all windmills are the same.! even My1986 patented Lonien windmill that has 0 gaps . Instead it pivots the flat blades to oppose its own infinately thin Blades( Infinatly Horrizontal) the facts remain uninvestigated. does this Equa and opposite design disprove Betz Limits ?.and mimic Einestines equal and Opposite reactions capable of .infinate energy values.?

This video makes people waste less money. =) Everyone experimenting with wind power should watch this first to get a good start!

Good explanation

Hi, calculated wind power is for one day or one hour?

please can you provide some more details regarding it we are making a project.

How to calculate the stresses applied (wind and gravity) to the blade/hub connection?

does it matter if we increase the number of the blades?

Thanks you a lot

excellent

How to calculate small wind produced 3 KW Please?

the wind pushes on what it touches it can't push on the gaps between the blades regards Graham Flowers

watch out: dm/dt = rho * A * v (velocity) NOT V (Volume)

The model is fully available on redslibrary website

Anybody can calculate how much watt i can get with in one hour? Blade height 6mt, blade with 1m, distance from blade to blade 12mt, total blade count 10. wind speed avg. 10 m/s and r/p/m is 60. Thanks.

Great presentation. Thanks for saving me money by investing in the wrong turbine.

5:12 what is TIP? Tips money for kelner? blade?

Yay somebody telling it like it is.

SUPERB

The conversion to mass (for KE= /2*m*v^2) from density and area needs another dimension: length to create a volume. This comes from velocity as a given mass passes thru A in unit time. However using v assumes v goes from incident v to zero as it passes the turbine. It does not, it becomes turbulent. If incident v = exit v then no reduction of KE has occurred. Application of this equation will always yield an inefficiency IF the input assumes v = 0 as it exits the turbine, which is impossible. Why doesn't anyone comment on this?

i need the pdf file

The derivation at 2:01 should use lowercase "v" for mass flow rate... it is conflated with volume which makes it confusing when it's plugged in to solve for kinetic energy,

Sir can you explain how to calculate deflection of vertical wind turbine..?

Doesn't the wing speed of turbine matter?

thanksអគុណបង

Try: GMRT Wind turbine, Gelibolu, TUBITAK

Betz law is so simple to beat I am surprised that it is a law at all regards Graham

I like your explanation but i belive in vertical wind turbine. because take less space.

I made it by myself. I used Avasva solutions for that.

super

So all those small turbines they are trying to sell, doesn't do much. The cost to install it with its own AC generator and inverter , and a battery for storage, isn't justifiable.

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15:12 how tf u get up there bro

to maxmize betz law, is simple, A×V=taetdw. todays windmills,are only like .04% efficient based on the current world record 8 mw Vesstass Vv-164 . :)

Excellent description of Air as Kinetic wind energy as Force from an actual Mass and it`s Acceleration. KE = 1/2 M x V squared. I think of it sometimes that we are fishing in a great ocean of air, catching and releasing billions of molecular fish with a large Rotor Blade Net. No bloodletting, no pain, Clean.

The size of the blades are pretty much at there max. Developers need to create turbines that can float on the ocean.