Another maffs thing I don't unnerstand

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Re: Another maffs thing I don't unnerstand

Post by JimC » Sat Jun 16, 2018 8:45 am

Blade design is of course vital, but if you have 2 blades with the same design, but one is twice the length of the other, then under the same wind speed, at the same elevation, the longer one will generate 4 times the power.
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Re: Another maffs thing I don't unnerstand

Post by Scot Dutchy » Sat Jun 16, 2018 8:48 am

JimC wrote:
Sat Jun 16, 2018 8:45 am
Blade design is of course vital, but if you have 2 blades with the same design, but one is twice the length of the other, then under the same wind speed, at the same elevation, the longer one will generate 4 times the power.
But the two blades would not be designed the same. That is totally hypothetical .
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Re: Another maffs thing I don't unnerstand

Post by Rum » Sat Jun 16, 2018 8:58 am

The OP was hypothetical. I was struck by the mathematical relationship between blade length, area swept by the blades and the squaring of the energy output when the length is doubled. It was about the maths involved not the practicalities of wind power.

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Re: Another maffs thing I don't unnerstand

Post by Hermit » Sat Jun 16, 2018 9:08 am

JimC wrote:
Sat Jun 16, 2018 8:45 am
Blade design is of course vital, but if you have 2 blades with the same design, but one is twice the length of the other, then under the same wind speed, at the same elevation, the longer one will generate 4 times the power.
Although friction, turbulence and whatnot make the increase in electricity output rather less than the increase of the swept area squared, it is not going to be linear.

Here's a real world comparison:

Image

If the increase were linear, a swept area with a radius of 100 metres would produce 1.5 MW, given that a wind turbine with a swept area with a radius of 10 metres produces 0.15 MW. The actual output is more than twice as much.

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Re: Another maffs thing I don't unnerstand

Post by Brian Peacock » Sat Jun 16, 2018 9:20 am

pErvinalia wrote:You know, you are becoming a real pain in the arse. And you know how I treat people like that. Is this really where you want to go?
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Clinton Huxley » 21 Jun 2012 » 14:10:36 GMT
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Re: Another maffs thing I don't unnerstand

Post by JimC » Sat Jun 16, 2018 9:26 am

In the diagram above, let's compare the 1.5 MW turbine with a swept area of approximately 3420 square metres, with the 2.5 MW turbine with a swept area of approximately 5674 square metres. The power produced is almost exactly proportional to the swept area, as I have consistently asserted...
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Re: Another maffs thing I don't unnerstand

Post by Brian Peacock » Sat Jun 16, 2018 9:30 am

Rum wrote:
Scot Dutchy wrote:
Sat Jun 16, 2018 8:12 am
Rum wrote:
Sat Jun 16, 2018 8:04 am
I'm sure that is a factor but the OP was about the relationship between blade length and energy production and for me at any rate the odd thing that it is so proportional.
Blade length is not the story but design is.

Wind Turbine Blade Design, Flat or Curved

Wind turbine design: Building a better blade
No. The story is blade length. That is what the OP says.
Yeah, some are confusing the design and engineering practicalities of turbine manufacture with the mathematical relationship between blade length and potential energy.

Hopefully I will be strictly punished for this remark! :evil:
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Clinton Huxley » 21 Jun 2012 » 14:10:36 GMT
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Re: Another maffs thing I don't unnerstand

Post by pErvinalia » Sat Jun 16, 2018 9:37 am

Stop being a drama queen.
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Re: Another maffs thing I don't unnerstand

Post by Brian Peacock » Sat Jun 16, 2018 9:45 am

Bite me.
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"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."

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

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Re: Another maffs thing I don't unnerstand

Post by Rum » Sat Jun 16, 2018 10:47 am

OK you guys. This is my thread so knock it off..or it will be detention! :prof:

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Re: Another maffs thing I don't unnerstand

Post by Brian Peacock » Sat Jun 16, 2018 1:27 pm

Awww, aren't I going to get a spanking then? :sulk:
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"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
.

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Re: Another maffs thing I don't unnerstand

Post by Tero » Sat Jun 16, 2018 2:17 pm

This topic has been a breeze. What else have you got?
http://karireport.blogspot.com/ (:_funny_:)
http://esapolitics.blogspot.com/
Guns? Guns: https://farm5.staticflickr.com/4714/264 ... 9c76_z.jpg
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1 Republicans cut tax, let everything run down to barely working...8 years
2 Democrats fix public spending to normal...8 years
Rinse, repeat.

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Re: Another maffs thing I don't unnerstand

Post by Rum » Sat Jun 16, 2018 4:43 pm

Round, like a circle in a spiral,
Like a wheel within a wheel,
Never ending nor beginning...

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Re: Another maffs thing I don't unnerstand

Post by JimC » Sat Jun 16, 2018 9:56 pm

So quixotic, this thread - so much tilting at windmills... :tea:
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Re: Another maffs thing I don't unnerstand

Post by Hermit » Sat Jun 16, 2018 10:47 pm

Tero wrote:
Sat Jun 16, 2018 2:17 pm
This topic has been a breeze. What else have you got?
Nothing.

Time to wind this discussion up, methinks.

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