Novel Offshore Deep Water Platforms | 21 comments (21 topical, editorial, 0 hidden)

Re: Novel Offshore Deep Water Platforms (none / 0)

adding, there are some sound engineering/cost reasons to go with a tripod foundation, but most of the research says to put the turbines in the middle. i have not investigated these pictured at all.

"Life shrinks or expands in proportion to one's courage." - Anaïs Nin

by Crazy Horse on Sat Feb 21st, 2009 at 07:42:26 AM EST
[ Parent ]

Re: Novel Offshore Deep Water Platforms (none / 0)

I'd guess and say that the foundation rotates to face the wind, because it seems like it would be easier for an active ballast system to work if each leg of the tripod was normally in roughly the same orientation to the wind.

In the picture, each of the turbines are oriented to face the other two legs of the tripod, but whether that is the design or it just happens to be illustrated with the wind coming in from that direction is not clear.

I've been accused of being a Marxist, yet while Harpo's my favourite, it's Groucho I'm always quoting. Odd, that.

by BruceMcF (agila61 at netscape dot net) on Sat Feb 21st, 2009 at 01:32:04 PM EST
[ Parent ]

Re: Novel Offshore Deep Water Platforms (none / 0)

Most of the modern floating structures are catenary to some degree, so they can't really orient to the wind freely. Check the NREL studies, they're all public on the net.

"Life shrinks or expands in proportion to one's courage." - Anaïs Nin

by Crazy Horse on Sat Feb 21st, 2009 at 01:50:44 PM EST
[ Parent ]

catenary? huh? (none / 0)

catenary - the curve theoretically assumed by a perfectly flexible and inextensible cord of uniform density and cross section hanging freely from two fixed points

I've been accused of being a Marxist, yet while Harpo's my favourite, it's Groucho I'm always quoting. Odd, that.

by BruceMcF (agila61 at netscape dot net) on Sat Feb 21st, 2009 at 02:26:57 PM EST
[ Parent ]

Re: catenary? huh? (none / 1)

Nope.

"Life shrinks or expands in proportion to one's courage." - Anaïs Nin

by Crazy Horse on Sat Feb 21st, 2009 at 04:04:43 PM EST
[ Parent ]

Re: catenary? huh? (none / 1)

Or rather,

"Life shrinks or expands in proportion to one's courage." - Anaïs Nin

by Crazy Horse on Sat Feb 21st, 2009 at 04:07:15 PM EST
[ Parent ]

So maybe the point of the picture is to ... (none / 0)

... stress that they don't fall over even when the wind is coming from the direction where it would seem most likely to tip over.

I've been accused of being a Marxist, yet while Harpo's my favourite, it's Groucho I'm always quoting. Odd, that.

by BruceMcF (agila61 at netscape dot net) on Sat Feb 21st, 2009 at 04:51:15 PM EST
[ Parent ]

Tip Over? (none / 1)

In projects i've worked on, we came up with a maximum laydown angle of 17 degrees, meaning from the normal vertical, in 120 kph winds. beyond that, we detuned the turbines to keep the angle upright (no greater than 17 degrees). We have no real world data on whether that was the correct decision, but even if wrong, we don't lose much energy if we have to derate sooner.

"Life shrinks or expands in proportion to one's courage." - Anaïs Nin

by Crazy Horse on Sat Feb 21st, 2009 at 05:16:17 PM EST
[ Parent ]

We're talking here about marketing ... (none / 0)

... not about engineering, when talking about the details in an "artists impression" drawing.

I've been accused of being a Marxist, yet while Harpo's my favourite, it's Groucho I'm always quoting. Odd, that.

by BruceMcF (agila61 at netscape dot net) on Sat Feb 21st, 2009 at 06:55:20 PM EST
[ Parent ]

Novel Offshore Deep Water Platforms | 21 comments (21 topical, 0 editorial, 0 hidden)

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