Another maffs thing I don't unnerstand

User avatar
Rum
Absent Minded Processor
Posts: 35241
Joined: Wed Mar 11, 2009 9:25 pm
Location: South of the border..though not down Mexico way..
Contact:

Another maffs thing I don't unnerstand

Post by Rum » Fri Jun 15, 2018 12:21 pm

I am interested in all things alternative energy and was watching a Youtube thing about wind turbines.

Turns out that for every doubling of the length of a wind turbine blade/vane it squares the amount of energy produced.

That seems incredibly neat and tidy to me and I can't begin to understand why.

Help stoopid Rum please.

User avatar
cronus
Black Market Analyst
Posts: 18025
Joined: Thu Oct 11, 2012 7:09 pm
About me: Illis quos amo deserviam
Location: United Kingdom
Contact:

Re: Another maffs thing I don't unnerstand

Post by cronus » Fri Jun 15, 2018 1:10 pm

Rum wrote:
Fri Jun 15, 2018 12:21 pm
I am interested in all things alternative energy and was watching a Youtube thing about wind turbines.

Turns out that for every doubling of the length of a wind turbine blade/vane it squares the amount of energy produced.

That seems incredibly neat and tidy to me and I can't begin to understand why.

Help stoopid Rum please.
It'll sweep four times the area. Might be something to do with it? Inverse square law or some such? Usually a equation involved. :roll:
What will the world be like after its ruler is removed?

User avatar
pErvinalia
Off his meds
Posts: 46824
Joined: Tue Feb 23, 2010 11:08 pm
About me: Spelling 'were' 'where'
Location: dystopia
Contact:

Re: Another maffs thing I don't unnerstand

Post by pErvinalia » Fri Jun 15, 2018 1:21 pm

Rum wrote:
Fri Jun 15, 2018 12:21 pm
I am interested in all things alternative energy and was watching a Youtube thing about wind turbines.

Turns out that for every doubling of the length of a wind turbine blade/vane it squares the amount of energy produced.

That seems incredibly neat and tidy to me and I can't begin to understand why.
God.
Sent from my penis using wankertalk.
"The Western world is fucking awesome because of mostly white men" - DaveDodo007.
"Socialized medicine is just exactly as morally defensible as gassing and cooking Jews" - Seth. Yes, he really did say that..
"Seth you are a boon to this community" - Cunt.
"You know you blokes didn't criticize Obama. You're lying. - Forty Two. Umm - http://rationalia.com/forum/viewtopic.php?f=22&t=42144

User avatar
Svartalf
Offensive Grail Keeper
Posts: 32295
Joined: Wed Feb 24, 2010 12:42 pm
Location: Paris France
Contact:

Re: Another maffs thing I don't unnerstand

Post by Svartalf » Fri Jun 15, 2018 1:43 pm

I'm not sure about the youtume being so right, sure, a longer vane also has a larger area, but it also has more weight to move and more inertia before it moves... still, Cronus seems to be on track.
Embrace the Darkness, it needs a hug

PC stands for "Patronizing Cocksucker" Randy Ping

User avatar
pErvinalia
Off his meds
Posts: 46824
Joined: Tue Feb 23, 2010 11:08 pm
About me: Spelling 'were' 'where'
Location: dystopia
Contact:

Re: Another maffs thing I don't unnerstand

Post by pErvinalia » Fri Jun 15, 2018 1:46 pm

I was thinking the same as you, Svarty. It doesn't make much sense. Energy return increasing exponentially? Don't think so.
Sent from my penis using wankertalk.
"The Western world is fucking awesome because of mostly white men" - DaveDodo007.
"Socialized medicine is just exactly as morally defensible as gassing and cooking Jews" - Seth. Yes, he really did say that..
"Seth you are a boon to this community" - Cunt.
"You know you blokes didn't criticize Obama. You're lying. - Forty Two. Umm - http://rationalia.com/forum/viewtopic.php?f=22&t=42144

User avatar
cronus
Black Market Analyst
Posts: 18025
Joined: Thu Oct 11, 2012 7:09 pm
About me: Illis quos amo deserviam
Location: United Kingdom
Contact:

Re: Another maffs thing I don't unnerstand

Post by cronus » Fri Jun 15, 2018 1:46 pm

Thing is hollow inside. Not made of solid wood.
What will the world be like after its ruler is removed?

User avatar
Svartalf
Offensive Grail Keeper
Posts: 32295
Joined: Wed Feb 24, 2010 12:42 pm
Location: Paris France
Contact:

Re: Another maffs thing I don't unnerstand

Post by Svartalf » Fri Jun 15, 2018 2:47 pm

it's not even made of wood.... I don't know if it's metal or plastic, but the ecological costs to manufacture it are nonnegligible.
Embrace the Darkness, it needs a hug

PC stands for "Patronizing Cocksucker" Randy Ping

User avatar
Scot Dutchy
Posts: 9108
Joined: Tue Feb 23, 2010 2:07 pm
About me: Dijk beschermer
Location: 's-Gravenhage, Nederland
Contact:

Re: Another maffs thing I don't unnerstand

Post by Scot Dutchy » Fri Jun 15, 2018 3:02 pm

All I remember is the longer the blade the higher starting speed but higher top speed. So it depends where it is being placed. The massive turbines are only suitable for sea use. Land based massive turbines often have to be started by powering the turbine until the wind can take over. Vertical turbines are good in light winds but useless in gales.
Image
"Wat is het een gezellig boel hier".

User avatar
cronus
Black Market Analyst
Posts: 18025
Joined: Thu Oct 11, 2012 7:09 pm
About me: Illis quos amo deserviam
Location: United Kingdom
Contact:

Re: Another maffs thing I don't unnerstand

Post by cronus » Fri Jun 15, 2018 3:32 pm

From my engineering degree I recall dynamics was harder than statics. Centripetal forces and all that jazz. Thing is spinning with the wind. Got four times the wind twice as far out. Weight is not in it since it is the spinning with the wind not as a result of the momentum of the propeller. I had a book on helicopter aerodynamics one time. Headache or what. At least there's no dead mans curve.
What will the world be like after its ruler is removed?

User avatar
laklak
Posts: 15610
Joined: Tue Feb 23, 2010 1:07 pm
About me: My preferred pronoun is "Massah"
Location: Tannhauser Gate
Contact:

Re: Another maffs thing I don't unnerstand

Post by laklak » Fri Jun 15, 2018 3:37 pm

Yeah well that's just, like, your opinion, man.

User avatar
cronus
Black Market Analyst
Posts: 18025
Joined: Thu Oct 11, 2012 7:09 pm
About me: Illis quos amo deserviam
Location: United Kingdom
Contact:

Re: Another maffs thing I don't unnerstand

Post by cronus » Fri Jun 15, 2018 4:43 pm

What will the world be like after its ruler is removed?

User avatar
Brian Peacock
Tipping cows since 1946
Posts: 20639
Joined: Thu Mar 05, 2009 11:44 am
About me: Ablate me:
Location: Location: Location:
Contact:

Re: Another maffs thing I don't unnerstand

Post by Brian Peacock » Fri Jun 15, 2018 8:52 pm

The effective area of a wind turbine is the circle described by the radius of it's blades.
  • Area of a circle = πr2
    10m radius: A = 314.16m2
    20m radius: A = 1256.64m2
The effective area of the 20m turbine is 1256.64/314.16 = 4 times greater than that of the 10m turbine.
.

"It isn't necessary to imagine the world ending in fire or ice.
There are two other possibilities: one is paperwork, and the other is nostalgia."

Frank Zappa

"This is how humanity ends; bickering over the irrelevant."
Clinton Huxley » 21 Jun 2012 » 14:10:36 GMT
.

User avatar
Rum
Absent Minded Processor
Posts: 35241
Joined: Wed Mar 11, 2009 9:25 pm
Location: South of the border..though not down Mexico way..
Contact:

Re: Another maffs thing I don't unnerstand

Post by Rum » Fri Jun 15, 2018 9:04 pm

Brian Peacock wrote:
Fri Jun 15, 2018 8:52 pm
The effective area of a wind turbine is the circle described by the radius of it's blades.
  • Area of a circle = πr2
    10m radius: A = 314.16m2
    20m radius: A = 1256.64m2
The effective area of the 20m turbine is 1256.64/314.16 = 4 times greater than that of the 10m turbine.
Basic geometry from Form 3. Of course I knew that..but kind of forgot it...*cough* :mrgreen:

User avatar
JimC
The sentimental bloke
Posts: 58945
Joined: Thu Feb 26, 2009 7:58 am
About me: To be serious about gin requires years of dedicated research.
Location: Melbourne, Australia
Contact:

Re: Another maffs thing I don't unnerstand

Post by JimC » Fri Jun 15, 2018 10:25 pm

Rum wrote:
Fri Jun 15, 2018 12:21 pm
I am interested in all things alternative energy and was watching a Youtube thing about wind turbines.

Turns out that for every doubling of the length of a wind turbine blade/vane it squares the amount of energy produced.

That seems incredibly neat and tidy to me and I can't begin to understand why.

Help stoopid Rum please.
It's actually quite straightforward. The energy that can be captured per time unit depends on the total volume of air passing through the swept area per time unit. Airspeed is one factor, the other is the swept area. This is a circle, whose radius is the length of the blades. Since the area of a circle is proportional to the square of the radius, so the power generated is proportional to the square of the blade length.
Nurse, where the fuck's my cardigan?
And my gin!

User avatar
Tero
Just saying
Posts: 24627
Joined: Sun Jul 04, 2010 9:50 pm
About me: Something something birds
Location: USA
Contact:

Re: Another maffs thing I don't unnerstand

Post by Tero » Fri Jun 15, 2018 11:01 pm

Yeah I love (hate) those youtube videos on science that tell you a whole bunch and leave the last bit out, cause it’s too complicated.
http://karireport.blogspot.com/ (:_funny_:)
http://esapolitics.blogspot.com/
Dominus vo-bisque'em Et cum spear a tu-tu, oh!

Post Reply

Who is online

Users browsing this forum: No registered users and 6 guests