Go Back   EcoModder Forum > Off-Topic > The Lounge
Register Now
 Register Now
 


Closed Thread  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 06-27-2017, 11:49 AM   #251 (permalink)
Master EcoModder
 
Join Date: Jun 2008
Location: Earth
Posts: 5,209
Thanks: 225
Thanked 808 Times in 592 Posts
Quote:
Originally Posted by sendler View Post
They are the ones doing the misleading by selling us on nameplate capacity versus cost.
Who exactly is "us" here? Really ignorant people?

 
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 06-27-2017, 12:39 PM   #252 (permalink)
EV convert
 
oil pan 4's Avatar
 
Join Date: Jul 2011
Location: NewMexico (USA)
Posts: 9,045

Sub - '84 Chevy Diesel Suburban C10
SUV
90 day: 19.5 mpg (US)

camaro - '85 Chevy Camaro Z28

Riot - '03 Kia Rio POS
Team Hyundai
90 day: 30.21 mpg (US)

Bug - '01 VW Beetle GLSturbo
90 day: 26.43 mpg (US)

Sub2500 - '86 GMC Suburban C2500
90 day: 11.95 mpg (US)

Snow flake - '11 Nissan Leaf SL
SUV
90 day: 141.63 mpg (US)
Thanks: 215
Thanked 2,952 Times in 2,299 Posts
Quote:
Originally Posted by redpoint5 View Post
Is there an advantage of mounting blades on the wind-leading side? Otherwise, I don't see why they haven't always been on the wind-trailing side. It seems the blades would automatically point into the wind when the blades are mounted downwind of the nacelle.
Yes.
The monopole will do something called vortex shedding.as the blades pass through this turbulent air they shutter and loose lift for a fraction of a second. This causes accelerated stress wear on the blades, blade connection plate and hub bearings.
__________________
1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
 
The Following 3 Users Say Thank You to oil pan 4 For This Useful Post:
jamesqf (06-28-2017), NeilBlanchard (06-27-2017), Xist (06-29-2017)
Old 06-27-2017, 01:29 PM   #253 (permalink)
Master EcoModder
 
NeilBlanchard's Avatar
 
Join Date: May 2008
Location: Maynard, MA Eaarth
Posts: 7,874

Mica Blue - '05 Scion xA RS 2.0
Team Toyota
90 day: 42.48 mpg (US)

Forest - '15 Nissan Leaf S
Team Nissan
90 day: 156.46 mpg (US)

Number 7 - '15 VW e-Golf SEL
TEAM VW AUDI Group
90 day: 155.81 mpg (US)
Thanks: 3,390
Thanked 2,885 Times in 1,813 Posts
Quote:
Originally Posted by redpoint5 View Post
Is there an advantage of mounting blades on the wind-leading side? Otherwise, I don't see why they haven't always been on the wind-trailing side. It seems the blades would automatically point into the wind when the blades are mounted downwind of the nacelle.
The down wind side of the tower stresses the blades when they pass out of and then back into the wind. Remember the blades are hundreds of feet long.
__________________
Sincerely, Neil

http://neilblanchard.blogspot.com/
 
Old 06-27-2017, 02:42 PM   #254 (permalink)
Master EcoModder
 
freebeard's Avatar
 
Join Date: Aug 2012
Location: northwest of normal
Posts: 18,075
Thanks: 4,948
Thanked 5,977 Times in 4,779 Posts
The story was about 'Segmented Ultralight Morphing Rotors'. The segmented part is for manufacturability and deliverability. the Morphing part is that the rotor (modeled on a Palm tree trunk) absorbs the stress of the wind shadow. If the blades are upwind they have to be stiff enough to avoid a strike on the tower.

Here's another article on the segmented blade.

https://cleantechnica.com/2011/12/09...-blade-design/

They also show a turbine with a hubcap.

Ferdinand Porsche built a trailing windmill in the 1930s. I can't find a picture of it online but one appeared in a Porsche magazine called Christopher. Maybe I'll find my copy someday.

If the wind shadow is really a problem, why don't they boat tail the tower?
 
The Following User Says Thank You to freebeard For This Useful Post:
Xist (06-29-2017)
Old 06-27-2017, 02:52 PM   #255 (permalink)
Master EcoModder
 
sendler's Avatar
 
Join Date: May 2011
Location: Syracuse, NY USA
Posts: 2,935

Honda CBR250R FI Single - '11 Honda CBR250R
90 day: 105.14 mpg (US)

2001 Honda Insight stick - '01 Honda Insight manual
90 day: 60.68 mpg (US)

2009 Honda Fit auto - '09 Honda Fit Auto
90 day: 38.51 mpg (US)

PCX153 - '13 Honda PCX150
90 day: 104.48 mpg (US)

2015 Yamaha R3 - '15 Yamaha R3
90 day: 80.94 mpg (US)

Ninja650 - '19 Kawasaki Ninja 650
90 day: 72.57 mpg (US)
Thanks: 326
Thanked 1,312 Times in 966 Posts
Quote:
Originally Posted by freebeard View Post
If the wind shadow is really a problem, why don't they boat tail the tower?
The towers are fixed. But the wind shifts. Only the top nacelle with the blades pivots to face the wind. Wind turbines always have an odd nuber of blades because the wind is much stonger at the top than it is lower down near the ground. So when one blade is straight up in the best position, there are two that are not quite in the worst position to equalize the loads as much as possible to minimize rocking forces at the hub.
 
The Following 4 Users Say Thank You to sendler For This Useful Post:
Fingie (06-27-2017), freebeard (06-27-2017), redpoint5 (06-27-2017), Xist (06-29-2017)
Old 06-27-2017, 03:15 PM   #256 (permalink)
Master EcoModder
 
freebeard's Avatar
 
Join Date: Aug 2012
Location: northwest of normal
Posts: 18,075
Thanks: 4,948
Thanked 5,977 Times in 4,779 Posts
The nacelle maintains the correct orientation. Instead of a full or truncated boat tail, maybe a Gurney flap on each side?

I don't really care, windmills should be indoors anyway.
 
Old 06-27-2017, 04:24 PM   #257 (permalink)
EV convert
 
oil pan 4's Avatar
 
Join Date: Jul 2011
Location: NewMexico (USA)
Posts: 9,045

Sub - '84 Chevy Diesel Suburban C10
SUV
90 day: 19.5 mpg (US)

camaro - '85 Chevy Camaro Z28

Riot - '03 Kia Rio POS
Team Hyundai
90 day: 30.21 mpg (US)

Bug - '01 VW Beetle GLSturbo
90 day: 26.43 mpg (US)

Sub2500 - '86 GMC Suburban C2500
90 day: 11.95 mpg (US)

Snow flake - '11 Nissan Leaf SL
SUV
90 day: 141.63 mpg (US)
Thanks: 215
Thanked 2,952 Times in 2,299 Posts
They tried it both ways, the way wind turbines are now is the best way we can currently build them.
__________________
1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.

Last edited by oil pan 4; 01-17-2020 at 03:19 AM.. Reason: Y
 
Old 06-29-2017, 02:46 PM   #258 (permalink)
Not Doug
 
Xist's Avatar
 
Join Date: Jun 2012
Location: Show Low, AZ
Posts: 10,206

Chorizo - '00 Honda Civic HX, baby! :D
90 day: 35.35 mpg (US)

Mid-Life Crisis Fighter - '99 Honda Accord LX
90 day: 30.47 mpg (US)
Thanks: 6,701
Thanked 1,928 Times in 1,465 Posts
Bizarre. I did not receive any notifications for a while and was afraid everyone stopped arguing. This is courtesy of Imgur: Converting kinetic wave power into electricity
 
Old 06-29-2017, 02:50 PM   #259 (permalink)
EcoModding Newb
 
redpoint5's Avatar
 
Join Date: Aug 2010
Location: Oregon
Posts: 8,489

Acura TSX - '06 Acura TSX
90 day: 29.14 mpg (US)

Lafawnda - '01 Honda CBR600 F4i
90 day: 47.32 mpg (US)

Big Yeller - '98 Dodge Ram 2500 base
90 day: 21.82 mpg (US)

Prius Plug-in - '12 Toyota Prius Plug-in
90 day: 57.64 mpg (US)

Mazda CX-5 - '17 Mazda CX-5 Touring
90 day: 26.55 mpg (US)
Thanks: 2,880
Thanked 3,268 Times in 2,436 Posts
I've really enjoyed this thread and have learned a lot from the comments/links others have posted. While I haven't changed my main stance that there is little that can be done to curb CO2 emissions by any individual (or individual country), it has opened my eyes to the enormous challenge to replace fossil fuel power with alternatives. Perhaps a negative GDP growth rate is inevitable in the near future.

I'm all for efficiency and conservation, but without a near 100% commitment and enforcement of a well thought out plan on a global scale, CO2 output is unlikely to be reduced any significant amount. You might say my philosophy on this is more pragmatic than idealistic.
__________________
Gas and Electric Vehicle Cost of Ownership Calculator







Give me absolute safety, or give me death!

Last edited by redpoint5; 06-29-2017 at 03:18 PM..
 
Old 06-29-2017, 09:55 PM   #260 (permalink)
Master EcoModder
 
freebeard's Avatar
 
Join Date: Aug 2012
Location: northwest of normal
Posts: 18,075
Thanks: 4,948
Thanked 5,977 Times in 4,779 Posts
Quote:
Converting kinetic wave power into electricity
At the end they have a statement about "If we could harness 0.1% of the world's tides, then...". Waves and tides aren't the same thing.

 
The Following User Says Thank You to freebeard For This Useful Post:
Xist (07-03-2017)
Closed Thread  Post New Thread


Tags
lies, opinion, reality, scam

Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com