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Polytech Unveils Flexible, Easy-to-Install Leading Edge Protection Solution

Thorbjørn Rasmussen and Michael Drachmann Haag of Polytech discuss the company’s new onshore leading edge protection (LEP) product, designed to be more flexible and easier to install than their previous offshore version. Get an inside look at the technical details and customer-focused approach behind Polytech’s latest wind industry innovation. Visit https://www.polytech.com/ for more!

Sign up now for Uptime Tech News, our weekly email update on all things wind technology. This episode is sponsored by Weather Guard Lightning Tech. Learn more about Weather Guard’s StrikeTape Wind Turbine LPS retrofit. Follow the show on Facebook, YouTube, Twitter, Linkedin and visit Weather Guard on the web. And subscribe to Rosemary Barnes’ YouTube channel here. Have a question we can answer on the show? Email us!

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Joel Saxum: Okay, guys, we’re recording here. We’re live right now at blades USA 24. We’re sitting in the area where there’s some coffee and some conversations, ISPs, asset owners, some blade design engineers, and of course, a lot of solution providers. I’m here with Polytech came over from Denmark on a world tour.

You’re heading back to Denmark. You’re going to OMS in San Diego, so we’ll be over there. Okay. So I’ve got Thorbjørn Rasmussen, chief commercial officer over at Polytech and also Michael Drakmann Haag. I got it, right? Yeah. Perfect. Perfect. So chief technical officer. So we have two of the great minds from the Polytech team here right now.

Polytech, while they do a lot of different solutions they have some lightning protection things, they sell to OEMs, sell to asset owners, all the above, out of Denmark. They’re really known for the L shells. L shells is a product that if you’re dealing in wind turbine maintenance at all, you know that the leading edge is a problem and the L shells were developed for offshore use originally, correct?

And they have been installed some onshore turbines, some high erosion areas, or even people that are like, you know what? I think this is the solution. I don’t have to touch my leading edges for 10, 15, 20 years. I’m putting the big stuff in. So you guys have been behind the scenes, behind the curtain, working on another kind of version of that, but adjusted specifically for onshore.

Yes, tell us about that.

Michael Drachmann Haag: Yeah, so we’ve taken all of the great learnings that we’ve had on the yellow onshore, offshore products, and then we’ve taken and built. On those innovations. And then we designed a product that then is easier to install comes at a lower price point as well. And really sets aside from the more, you could say more complicated stuff that you get out in the industry.

But while still having the the great performance and also then we don’t need the material to cure at site, which we often see with coatings and other products. So I think we really try to say that. All of the good things we have from the offshore, we build in that, that into an offshore product.

And yeah.

Joel Saxum: So I would say, as you thought, so driving this market, primary market research, as we call it, of course, in the commercial world, did you have asset owners come to you and say, hey, this is great, but we’d like this?

Thorbjørn Rasmussen: Absolutely. We have been cooperating a lot with the ISP out there, getting feedback for installation method and and what was actually difficult or less easy for the, let’s say the premium version.

And then asset owners is when they, Take the decision very shortly sometimes they want to run a campaign So it should be easy accessible and so forth and all that feedback has gone back to Michael and the department and try to make sure that was incorporated in the solution And we can elaborate more on this one.

Joel Saxum: Yeah. Yeah, but I would say that it’s feedback from the last five years from the field all over the world. Yeah, the best kind of feedback. X. What’s happening. Empirical data from the field is what we want to change things on. Exactly. We could test in a lab all day, and that’s great. We need to do that.

But when we get results back from the field, that’s what we want. So let’s talk a little bit about the differences between the new Onshore product and what the L looks like. Offshore product was or is still, of course it’s still offered.

Michael Drachmann Haag: I think that the primary part that really sets it aside is the thickness of the material itself.

So the thickness of the material on the offshore product is thicker and thereby also having high performance, but it also entails that we need to tailor make that product into the specific blade. So it really provides a high performance, the highest performance in the industry. But it had to be tailor made to a specific blades.

Now we set aside with a thinner product that is more flexible and can be installed faster and can actually also be installed. Let’s say it’s a more, it’s not going to be tailor made to the specific blade, meaning it can be installed on all blades directly out of the box.

Joel Saxum: Oh, that’s fantastic.

Michael Drachmann Haag: And that’s, I think that’s really is one of the things that sets aside.

What we then took as innovations as well is that we have the split liner on LA offshore. And we took that great innovation and then we transferred that to a lawn show for ease of installation as well. That’s huge.

Joel Saxum: I want to touch back on the point of being able to install on different parts of a fleet.

So in the United States, of course, we have large wind farms. That’s a hallmark of kind of the market over here. And in those large wind farms, you’ll see sometimes, we deal with it at WeatherGuard quite often, you’ll see sometimes, four different manufacturers of blades and two or three different subtypes of blades in a specific wind farm.

And we just dealt with this one in an on one product. So if you have say let’s take an example of GE, the new GE generation turbines, the two Xs, right? Two five, two eight twos. They’re regularly come with 116 meter blades and 100 or 116 meter rotors, not blades, sorry, and 127. And Within those two sub models, you also have TPI can make your blades, LM can make your blades.

There’s a bunch of different manufacturers and there is little discrepancies between them. So if you had to have a custom made solution such as the L shells, the or the offshore shells, it would be a little bit more difficult. Now with the onshore version, you’re saying, Hey guys, you want to do a capital campaign?

You want to install on a hundred turbines? Here’s the product. It’ll work on every one of them. Yeah.

Michael Drachmann Haag: You just need to order the number of meters you need. And then the final adjustment right at the tip where there’s a big curvature on the blade. Yeah. That’s the point where you do a small modification, but that modification can be done on site.

Perfect. So perfect. That really either blade make or turbine model. It really just can be fixed on anything.

Joel Saxum: So let’s talk a little bit more about the technical details of leading edge protection. From an expert’s standpoint, we regularly hear, you should put on four meters, you should put on six meters, you should put on 10 meters.

You could do two meters of shells or three meters of shells and this much of a tape or this much of a coating. If you were, if you had a wind farm, and I know every one of them is different, say I’m going to put you in the middle of Texas. How many meters of this new product do you think you’d put on?

Michael Drachmann Haag: It really depends on your specific turbine, right? So the bigger turbines will also require more, a bigger length, a longer length of protection. But what we typically do, and we can do that for any site in the world, we can offer a calculation, a specific calculation for that specific site, that specific turbine, that allows you to exactly predict What do you need?

And we will then be able to sell you exactly what you need. No more, no less. Then there might be some some campaigns where you fix it, fix the number to installing 10 meters, because that fits within a day of working day. And then it might be that is the right option for that specific site. It really depends based on the customer.

But I think we try to deliver the calculations behind, but also the product that can then fulfill that.

Joel Saxum: So if an asset owner or an ISP or an asset owner and ISP in conjunction, contact Polytech to say, Hey, we’re looking at your leading edge protection solutions. You guys can also offer the customer success first support part of that too.

Hey guys, we believe through calculation that this is how much you need. So when you’re contacting you guys, you’re contacting experts in LEP.

Michael Drachmann Haag: Yes. They’ll get a report that then says what is the expected length you need, but also what is the expected repairance was. If there are any repair intervals.

So that means that they can already now plan the predicted maintenance. Yeah. So when do you need to go and look at the blade again?

Joel Saxum: Yeah.

Michael Drachmann Haag: And when do you then need to maybe plan for repair?

Thorbjørn Rasmussen: Okay.

Michael Drachmann Haag: Again, depending on site conditions and terminal conditions.

Thorbjørn Rasmussen: Just a little caveat to this calculator. It’s based upon two heavy input.

The one is 20 years of weather data from NASA. Simply put into a database. And then correlate it with many hours in the wind erosion tester, sorry, the rain erosion tester. And then combining, of course, with verification on let’s do this. And according to the new standard and then having feedback from certain areas of the world saying we calculate this on this coordinate, how does it actually look after seven years?

Joel Saxum: Ground truthing it. Yes.

Thorbjørn Rasmussen: And then the service department or OEMs, the asset owner has then feedback to us and then correlate it together with us. Yes, it actually matches what we’re seeing out there. A little bit less or a little bit more, but more or less matches. We are pretty sure this tool is is the right one for the acetone.

And the great thing is there’s no price tag to it because we offer it for free. Everybody likes free.

Joel Saxum: It’s where they get you at the end on the LEP prog. Okay. Okay, so let’s go back to this LEP prog, the new one. You guys have of course been through the rain erosion testing. You’ve done your due diligence in the design phase and in the testing phase.

But you’ve deployed it already as well, too.

Michael Drachmann Haag: Yeah, so we have already installed it in a site in Denmark. That was our first installation. And then later last year, we also installed it in Denmark. I would say challenging conditions in Canada as well, really to get the winter season across, so the cold temperatures.

So we’re going to go and inspect those turbines here in the coming the coming months as well.

Joel Saxum: So another thing I want to touch on here, and we talked about a little bit off air, but we’re all in the wind industry, and when you talk about aftermarket upgrades, if you’re talking about, it doesn’t really matter.

VG panels, our strike tape product, the polytech shells, any kind of LEP, any addition or add on to a blade. They operate in a crazy environmental conditions. If you’re listening to a podcast, you know this. It’s in rain, it’s in dust, it’s in bugs, it’s 300 km an hour tip speeds, it’s all these things. So unless those products are installed correctly, right?

When someone gives you a set of instructions please, this is begging the industry and all the technicians out there, please do it per the instructions. There’s a lot of work that has gone into those instructions to make it so that the products last on the blade. What have you guys done with the new product to make it easier to install in the field to we guarantee that durability, longevity, efficacy of the product out there?

Michael Drachmann Haag: So the split liner is really one of the things where we aid the operator in installing it correctly. What we also do is that we we allow the product to apply with a water film. So you can squeeze out any air that might be there. I think that’s a really benefit for product like this.

And then what we’ve done is that we’ve also selected materials that are robust against these different conditions that might be there. Low temperatures, high humidity. And then one of the other elements that we also found as being challenging is the edge sealant that is being performed on typical mini products that we’ve removed from this product also too.

Make it a fast installation. One less step. Yeah, exactly. And you don’t have this liquid chemical on site that needs to, that needs secure. . So it complicates or removes a bit of complication. In the product and in this, the installation. So less steps, less complicated, easier to work with.

Yeah. Risk of failures.

Joel Saxum: So of course we don’t want to give away your secret sauce, but if you were to give me like. The quick 5 steps. What does it look like to install and how does the product come?

Michael Drachmann Haag: So if we take the product That is right there. Perfect. The product here is that’s the product, that’s the material that we have.

So it comes as a flexible film.

Joel Saxum: Okay.

Michael Drachmann Haag: About 300 millimeters wide and it fits the blade perfectly. Okay. The curvature of the blade. When we look at the the adhesion method, then we have the split liner. Okay. Okay. So it comes here with a split liner that the first parts in the in the sensor is removed and then it’s installed in the center.

And then you have fixed it fixated the products right to the blade. And then you install the sides afterwards. And that can, what we’ve done so far in, in our sort of application environment that we have at Polytech in Bramming is that we’ve installed it in a continuous length as well.

Joel Saxum: So if you’re putting on six meters, eight meters, 10 meters.

You’re getting a roll of this, basically.

Michael Drachmann Haag: You’re getting a roll of that, and then you install it in one piece. Of course, if you’re hanging from a rope, it might be a bit more difficult to do. But but from a basket, we’ve succeeded in installing it in a continuous length.

Joel Saxum: Okay. Like a traditional LEP product, you’re making sure, you can’t have cat two, cat three, bad damages in the leading edge.

Those need to be cleaned up by a technician. Blade preps, we’ll do a little sanding, do a little alcohol cleaning, make sure the thing looks beautiful. Okay. Then from there on, do you need to, is it a spray bottle of water to put on there so you can squeegee it out?

Michael Drachmann Haag: Yeah, typically spray water on the blade, but also on the product.

Joel Saxum: Okay.

Michael Drachmann Haag: Because then you don’t have that immediate tack.

Joel Saxum: Yeah.

Michael Drachmann Haag: And then you, this allows you to squeegee out any air bubbles that might be. It’s like putting window tint on. Exactly.

Joel Saxum: Right? I think Americans are good at that as well. Perfect. Yeah. Especially in Texas, everybody has tint on their windows because it’s too dang bright down here.

Okay so the product itself very interesting different than what you feel in the rest of the market, right? I’ve never put my hands on an LEP product that felt like that. But you can feel that it would almost, so I’m talking rain erosion testing, that it would almost cushion against rain droplets rather than take a hard impact.

Michael Drachmann Haag: Yeah. And definitely that’s where we’re combining the the thickness of that absorption power of the material, but also ease of installation. Yeah. So if it becomes too thick, the installation becomes a bit more difficult to do. So we are finding the right balance between that thickness and then the, also the, let’s say the performance in the rain version tester.

Joel Saxum: All right. Is it available now?

Michael Drachmann Haag: Not for serial delivery. Not today. Okay. But it will shortly be at least.

Joel Saxum: Okay.

Michael Drachmann Haag: All right. We are working hard in our facilities and bombing really to to make the product ready.

Joel Saxum: Perfect. Okay. So let’s so we’ve got the product. We’re also gonna shift gears here.

We’re gonna talk Polytech for a little bit. So Thorbjørn you were telling me that you guys are making some moves.

Thorbjørn Rasmussen: Yeah. But just to confirm that in a short while is in a few months. In June, we are absolutely sure that we can deliver to the market. So that’s why we’re bringing it to the market now.

So people can feel in touch and get an idea. And then of course, maybe plan for late season. We have been Working from Europe to towards U. S. with travel, visit, and so forth. And we will continue doing that, and our normal staff is still available. We have strengthened a little bit. But we actually had a sleeping company in U. S. And we’re probably going to reactivate that in order to create also a warehouse situation that we can deliver with short notice out of, Out of the U. S. Oh, fantastic. Yeah. And simply also, some of the feedback we’ve gotten is that ease the installation, ease the access, and have a decentralized warehouse situation in the U. S. And we try to listen. And so within within this year we are planning to activate that as well. Yeah.

Joel Saxum: From a customer success standpoint, it’s fantastic to have someone. Denmark and the U. S., you’re six, five, six, seven, eight hours apart, right? So it’s nice to have someone here to help the customers have that warm, fuzzy feeling that probably takes right down the road.

Exactly. Fantastic. Okay, guys, so we’re nearing towards the end of what we want to chat about here, but I want to make sure that anybody that wants to see the product can get their hands on it. So we’re at Blades right now. In two days, we’re going to OMS. You guys will be in OMS. Yes. OMS. And then we’ve got global shows coming up.

We’ve got Wind Europe Bilbao, you guys will be there. Hamburg is of course the big one this fall, it’ll be there for sure. By then we’ll probably see some more installations. Yes. Anywhere else that you guys are going to be that people can visit?

Thorbjørn Rasmussen: Yeah next week we will be in Tokyo. With the Japan Expo then we will also have a couple of smaller areas in Europe and in and of course in October the annual fair in China.

Yeah. We also exhibiting there. And of course we will concentrate this year on this product launch, but of course you can always come by and hear about all our other solutions.

Joel Saxum: So we’ve got, if we want to reach Polytech, of course. That’s an easy one. If you’ve got a technical question, are we giving out your LinkedIn?

Michael Drachmann Haag: I think it’s best getting through the commercial guys first. He likes to talk, right? We need to focus on the product. That’s right. You’ve got stuff to do.

Joel Saxum: So what’s the best way to get a hold of Polytech if you need to?

Thorbjørn Rasmussen: It’s simply to contact me or one of my business development sales team.

The Mark Folley, or the Thomas Nilsson, and so forth. And but if you go to our website, you can find names and address numbers, email address etc. That’s probably the easiest way, and you’ll find me and my colleagues there.

Joel Saxum: Fantastic. Polytech. com, if you’ve got questions about the new LEP product they’re putting out, the existing LEP products they have in the market, or any other solutions.

Fellas thanks for coming on the podcast.

Thorbjørn Rasmussen: Thanks for having us. We’ll chat soon. Yes. Thank you.

https://weatherguardwind.com/polytech-flexible-leading-edge-protection/

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Omterra Rebrand, Goldwind Warns on Turbine Size

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Omterra Rebrand, Goldwind Warns on Turbine Size

Siemens Gamesa rebrands as Omterra, Goldwind questions ever-bigger turbines, and MIT revisits the century-old Betz limit.

Sign up now for Uptime Tech News, our weekly newsletter on all things wind technology. This episode is sponsored by Weather Guard Lightning Tech. Learn more about Weather Guard’s StrikeTape Wind Turbine LPS retrofit. Follow the show on YouTubeLinkedin and visit Weather Guard on the web. And subscribe to Rosemary’s “Engineering with Rosie” YouTube channel here. Have a question we can answer on the show? Email us!

The Uptime Wind Energy podcast, brought to you by StrikeTape. Protecting thousands of wind turbines from lightning damage worldwide. Visit striketape.com. And now your hosts

Allen Hall: Welcome to the Uptime Wind Energy Podcast. I’m your host, Allen Hall, and I’m here with Rosemary Barnes, who is recovering from a very serious illness, Matthew Stead, who has been healthy pretty much all the Australian winter, and Yolanda Padron in sunny, hot Austin, Texas. Welcome, Rosemary

Rosemary Barnes: Thank you. I am recovering from man flu, and I say man flu because it’s just a cold, but I’m complaining a lot about it.

Allen Hall: there’s gonna be a new name for Siemens Gamesa. So it was Siemens and then Gamesa’s a separate company. They merged. Siemens Energy, uh, broke off from Siemens AG. So [00:01:00] that’s a very well-known name, Siemens. It’s– Everybody knows Siemens at this point around the world.

And the, the one family had, as a company, had s- label on everything, right? So it’s, uh, Werner von Siemens started it 150 years ago. It’s been a long time since Siemens was started, but it’s everywhere. It’s on turbines, transformers, and power plants around the world, and now they’re changing their name, right?

So when Siemens Energy broke off from Siemens AG, they, they had a limited time they could use that name, so they have rebranding themselves or are about to rebrand themselves, and I wanna pronounce this right, Omterra. O-M-T-E-R-R-A. Now, we did a little research on this, and I think it’s Latin for all of the world.

It’s kind of a conjoined, uh, set of words, Latin words, kind of a, a schmear in a sense. So, uh, so the company that, you [00:02:00] know, that spun off in w- roughly 2020, if I remember this right, Matthew, does that sound right? It was roughly 2020 when Siemens Energy was established on its own. Uh, they’re gonna be changing their name to Omterra.

So instead of seeing, seeing Siemens Gamesa publications or Siemens Gamesa wind turbines, I guess they’re gonna have this new name, Omterra. What do we all think?

Matthew Stead: I think it’s great. I think, and if you go back to, you know, GE Vernova, um, I, I thought Vernova was a bit weird for a while, but now it just rolls off the tongue and easy. It just makes so much sense. Um, so I’m, I’m, I’m for it. I, I like it. I’ve already… You know, can already say it. It took a lot longer to say Vernova than it’s taking to say

Terra.

Rosemary Barnes: I think that it– But it’s not Vernova, it’s GE Vernova, right? So everyone knows what it is. Whereas my understanding is it’s not Siemens Omtera, it’s just Omtera, which makes it sound like a new budget kind of [00:03:00] brandless, history-less, uh, company. So that’s… Yeah, I’m no

branding expert, but I think that, uh, like they, they must have not been able to use the word Siemens at all, um, because otherwise you surely would, because it has a very…

Outside of, you know, their blade issues and bearing issues of a couple of years ago, they do have a, like a solid engineering reputation across many fields, so you wouldn’t probably intentionally divorce yourself entirely from that. So, um, yeah, I, I think it will take some getting used to for me

Matthew Stead: but everyone remembers. I mean, it’s not like– The people in the wind industry know their heritage, they know their history, so I don’t think it matters. I mean, you know, you know, they, they purchase the Senvion, you know, technologies or, you know, licenses in Europe. You know, y- y- you don’t forget these things, so I don’t think it matters.

I think it’s just a, it’s a color, it’s a, it’s a label

Yolanda Padron: I think it’ll be fine. I just think that there will be a little [00:04:00] bit of confusion down the line as with everything, right? Like I’ve, I’ve been on the side of conversations where I have to explain like Siemens versus like SGRE on paper and it’s like, oh, it’s– this is why th- there was that paper trail, uh, because people would think it was an absolutely different thing.

Um, so I, I can totally see those conversations coming, coming to play in the future where someone thinks that Ontier is a completely different entity that maybe they changed OEMs or something, um, for a site. But nothing a little history lesson won’t fix, I guess.

Matthew Stead: You just want people talking about you

Rosemary Barnes: Name change every year

Allen Hall: Change your name every year. Well, that’s, that’s one way to approach it. I w- always wonder what the boardroom looks like and sounds like when this discussion is going on, because Siemens, Siemens Energy is a big company, and there had to be outsourcing of this to probably several marketing firms, mostly [00:05:00] in Germany, I’m guessing.

And they came back with a bunch of pitches, and eventually they picked one. But boardrooms are probably not the place to pick a name. And I always think like, “Oh, you just had such a opportunity to do something really cool or really impressive.”

Allen Hall: Well, we’ll see how it goes with Omterra. The, it’s gonna be, I’m sure, a huge marketing effort, and you’ll probably see commercials for it during the Super Bowl.

Developers are [00:06:00] eyeing Britain’s next big renewables auction and have been waiting to learn the rules and most importantly, the price. Well, this week the UK government delivered both. It confirmed a package of changes to the CFD scheme ahead of allocation round eight, aimed at simplifying the process and keeping good projects from being tripped up by some paperwork.

So AR7 was super successful, and they’re hopefully gonna have a, a great allocation round eight. Uh, unchanged from last round, here are some pieces to it. AR7 brought in 15 gigawatts of, of new capacity, uh, well below the ceilings, and the government is betting that that’s stability from AR7’s gonna exist for AR8, so they’re keeping the pricing limits the same.

And let me give you some of the numbers here. So everything’s in 2024 prices, just so we have a baseline here. It, 113 pounds per megawatt hour [00:07:00] for fixed bottom offshore wind, 271 pounds for floating offshore wind. That’s, uh, pounds per megawatt. And then 92 pounds per megawatt for onshore wind, and s- 75 pounds per megawatt for solar. So 271 pounds per megawatt hour in 2044 dollars is, you know, you’re probably talking, what, 290 pounds per megawatt hour. That’s a really good strike price or ceiling to allow, uh, some more floating wind into the UK waters

Rosemary Barnes: Yeah. Well, the UK have this newly signed agreement with Japan, right, to, to progress development of that technology. I feel like I, I haven’t looked up any numbers to back this up, but I feel like the gap between fixed bottom and floating is narrowing. It’s barely more than double now, which, um, yeah, I think is not that bad considering how little development there has been for floating offshore wind compared to fixed bottom.

So [00:08:00] yeah, I think that it is an interesting technology to develop. I, I know with the, um, auction rounds and ’cause it’s a government thing, it’s easy to think, “Oh, why are you spending any money on anything other than the cheapest one?” Because y- you know, like, it, it feels weird that the government would play, you know, when they’re purchasing power for their grid, that they would do any more than trying to just get, you know, bulk power at the cheapest price possible whilst ensuring, you know, reliability.

Um, but in the previous or the previous, the one– last one or the one before that, they had quite a few tidal projects announced that certainly, you know, an expensive and not mature technology. But I think that you can’t say the same thing about floating offshore wind. I think that it is on a, like a good, a good development trajectory, and there are certainly places on Earth where floating offshore is one of the most appealing technologies.

You know, if you think of through to 2030s, 2040s, there’s plenty of places where, um, you know, slightly higher [00:09:00] price paid for floating offshore wind will still be worth it because they have so few other options available. So it makes sense as an industry to in- invest in capabilities there.

Matthew Stead: think it’s a really interesting method. It seems to be really successful, the contract for di-difference approach. So, um, I’m, I’m surprised that it’s not adopted more widely, um, in other locations,

Rosemary Barnes: it is around a bit.

I would like to see it, like, in, in Australia, we are, we are developing some new wind projects, but not as fast as we need to, to, you know, hit our upcoming targets. And I think, like, while the government is doing some things to help move or help incentivize developers, it’s not working that well, and maybe CFD would be a, you know, a bit of a better way to, like, just actually guarantee that these projects are gonna go ahead.

Allen Hall: Australia has a shipping problem. there’s been a concern at state-owned transport hubs are becoming less supportive of [00:10:00] wind energy projects with ACEN Renewables saying that they will now have to truck a large transformer from a wind project or for a wind project in northern New South Wales from the Port of Adelaide.

That’s not necessarily close. And h- they also said that the Port of Brisbane has refused to accept passage of some big transformers for a solar farm. also there’s some, uh, something about blades not being able to be accepted in certain ports. Like some of the, uh, Australian state-managed or state-owned ports are not accepting renewables.

Rosemary Barnes: I think

also that blades in Queensland can only be transported to site like one per day with a full police escort or something. It’s wild to

me ’cause, you know, like I lived in, in Denmark for so long and there were blades going up and down just the normal highway every single day, multiple like, uh, and three– they would go in sets of threes for obvious reasons.

Um, yeah, but the, the, the [00:11:00] Queensland government changed like a, a year ago or, or so, and it changed to a very anti-renewables government and they just threw all of the state’s renewable plans in the bin,

Allen Hall: such a recent change that when they, at least the news articles I’ve seen about it, I’ve only seen a handful, that they have, um, like last year some big transformers, like really difficult to move items have come through those ports and they’re just not letting them through now. How does that work?

If you have a, a, a legal right to build a wind farm or a solar farm or, or substation or whatever’s going on there, how do they reconcile not allowing those components to come through a port? In what world does that make sense?

Matthew Stead: I mean, most of the ports are– yeah, most of the ports are privatized, so it’s up to the individual commercial entity that’s running the port, I would, I would imagine. So it’s beyond the control of the government, would be my first guess.

Yolanda Padron: it seems like it’s an, a federal sort of thing that would give permits.

Matthew Stead: No, I mean, I’ve done a bit of work in the Port of Melbourne and, [00:12:00] um, it’s facilitated by the government, uh, state government, not federal, and but the ports are largely privatized.

Rosemary Barnes: I just pulled up an article and it says that it’s state-owned transport hubs are becoming

less supportive of wind energy projects. Um, yeah, and that’s the reason for why they’ll have to get that transformer in northern New South Wales, so very close to Queensland. They have to go from Adelaide, where you live, Matt, all the way through South Australia, maybe Victoria, New South Wales, and then, yeah, up to nearly the border.

Allen Hall: Is that just a temporary blip that the next election cycle it’ll revert back or is this something that’s more long term?

Rosemary Barnes: uh, it’s not obvious that it’s gonna flip straight back, that’s for sure

Allen Hall: [00:13:00] for years, the race in wind has run mostly in one direction: bigger and bigger blades, bigger towers, bigger machines.

And now a chief engineer f- at one of China’s largest turbine makers says it’s time to pump the brakes. Bo Juul Petersen, uh, Goldwind’s chief engineer in Denmark, argues that scaling turbines up no longer makes economic sense. So it’s not an engineering question, it’s an economic question. His reasoning rests on a simple rule of geometry, the square cube r- law, which says that as a turbine grows, its materials and costs climb faster than the rotor area that earns the revenue.

Past a certain point, he says, bigger simply costs more than it makes. Have we crossed that threshold yet? Is 20 megawatts that, [00:14:00] uh, pivot point where it doesn’t make any more sense to make a larger turbine?

Matthew Stead: didn’t we have problems when we went from three to six?

Allen Hall: One to two.

Matthew Stead: I, I, I think, uh, I think it’s good that someone’s actually coming out and saying this

Yolanda Padron: Whoa, whoa, whoa. Rosie’s on the podcast.

Rosemary Barnes: yeah, ex-excuse me, this is one of my topics of obsession that I constantly carry on about. I made a whole, a whole video about it with, um, equations to back up my opinions about scaling, um, and a very nifty tug of war metaphor between economic factors that favor big wind turbines and economic fav- factors that favor small ones.

And I think that we’re always a little bit ahead of, of what the right, the right balance is between those. So, you know, the benefits from having bigger turbines are that, um, you have fewer electrical connections, for offshore especially, that means less subsea cables and, um, yeah, just like much faster Faster construction of all that, you [00:15:00] know, less, uh, substructures and less, less of everything to install, less of everything to maintain as well.

You know, it doesn’t take so much longer to get up and do your annual maintenance checks of a big turbine compared to a small one. Like, it takes longer, but not, not that much longer. Um, but then all of the structural factors favor smaller turbines over bigger ones. blades especially, as they get longer, you get so many more problems in O&M, but they don’t show up on the developer’s spreadsheet, you know. The spreadsheet that you’re using to decide, um, your f- your final investment decision, it, it doesn’t, it doesn’t know that you’re gonna have a whole bunch of blade issues.

It doesn’t wanna know and so I think that that’s one factor that has pushed us past the economic point of where wind turbine size should be. And I think the other thing is prestige. I know that when I worked at LM, you know, we had the longest blade in the world.

It was 88 meters, was our first, um, world record that we set while I was working there. They’d had many before that. We had– They [00:16:00] had a, like, one-to-one scale printout of it that they took to WindEurope or WindHamburg, um, that everyone stood in front of, and then they lost it to somebody, and then they got it back again with the blade for the Halieade-X.

And we all know how well that went to, you know, have the world’s longest blade. Y- you know, it wasn’t so easy to make it, turned out. It’s very easy to announce and not so easy to make, um, with reliable quality. And now we’ve got all these Chinese companies, especially MingYang, is constantly announcing the world’s biggest something.

Um, don’t sell so many of them, but it’s not the point, isn’t to sell them, it’s to have the prestige of making the world’s biggest something.

Allen Hall: Yeah, what would be the technology breakthrough that would allow it to be more stable at a 20 or 25 megawatt? Because right now I’m, I’m seeing 1% improvement here and there, not 5%, 10%.

Rosemary Barnes: Yeah, I mean, 1% improvement will eventually add up to what, what you need. Maybe it’s in

20 years’ time, not 10 years’ time. But y- you know, like you can imagine anything. maybe [00:17:00] they start somehow, like aero and automotive manufacturing technologies get cheap enough that we can start making wind turbine blades with all prepregs instead of y- you know, um, you know, dry fabric and infusion.

For example, maybe 3D printing gets cheap enough that you can make your whole, whole blade from an additive process. Like a- anything like that. But it can also be other things like maybe the cost of subsea cables in- increases like a whole lot, and then if, you know, like things on one side getting more expensive can make it more worthwhile to save hard problems somewhere else. So that’s why I say it’s like a, it’s a, a ve- it’s a multivariable optimization problem that changes every time you have a…

Like for every project to project from year to year, it’s always gonna be slightly different. So I don’t think it’s wise to definitively say 20 megawatts is the threshold that we should never cross. Like I, I don’t agree with that.

Allen Hall: It’s one of those arguments, I think, about [00:18:00] any sort of technology about where the endpoint is. There’s too many variables to predict it. I always point to aviation in which older airplanes will hang around and hang around and hang around until the fuel price goes up enough where it doesn’t make sense to operate them.

So they will fly an airplane un-until they can no longer structurally do it. But if the price of oil shoots up and the price of aviation fuel bumps up, those airplanes get parked, and then they’re buying the new airplane with a more efficient engine. It’s a similar thing, I think. There’s just– You can’t tell where the technology’s gonna go or what the economic impacts of any part of that business will force you to do something different.

So it’s gonna be higher than 20 megawatts, guarantee you that.

Yolanda Padron: Well, it’s one of those things too, right? Where if we’re repeating the, the same blade type and we’re getting smarter about operating that same blade type, then the economic cost goes down, [00:19:00] right? Like, eventually. ‘Cause then you’re not just experimenting on every new thing or having to take all of the, the funding into tr- specializing techs or getting very specialized techs onto your site and finding a new– kind of the wheel every so often. [00:20:00] So speaking of larger wind turbines, evidently we’ve been doing this all wrong, that we’ve had the calculations for the, uh, Betz limit has been off, and, uh, a group of MIT engineers, I guess, uh, have, have made a breakthrough.

Allen Hall: So basically every wind turbine that is spinning today is based on some fundamentals, uh, math, empirical data in, in some level, but on formulas that have led us to design the wind turbines and that core formula called the momentum theory. And if you hear blade designers who hang around blade designers, which I don’t necessarily recommend, but if you do hang around blade designers, they, they’ll say the momentum theory, momentum theory, like, “Yeah, yeah, yeah, yeah, I got it.”

It, it, the– MIT is saying it breaks down exactly at the operating point where modern turbines try to live. Um, so for a century the fix [00:21:00] was a patchwork of corrections and useful, but with no real theory behind them. Now, a team at MIT said it has rebuilt the math from first principles, creating what they call a unified momentum model. It even nudges at the famous Betz limit, the century-old ceiling on how much energy a rotor can capture, and it bumps it up by a few percentage points, and that would be the first uptick to the Betz limit in over 100 years. All right, Rosemary, as our official Betz limit expert, does this make any sense?

Have the MIT folk something new?

Rosemary Barnes: a wind turbine blade, its aerodynamics are just the same aerodynamics as what keeps an airplane in the sky, right? It’s, it’s all the… It’s just an airfoil. It’s just facing a wind speed, um, you know, a local wind speed. It’s complicated by the fact that [00:22:00] a wind turbine blade is also rotating, so the wind speed is different along the whole span, and that’s, uh– and so is the flow angle, and that’s why blades are twisted and tapered.

Um, but you know, essentially when you wanna figure out how much energy, uh, a wind turbine is gonna generate or you wanna design the blade so that it optimizes that amount, you’re just slicing it up into a whole bunch of little bits of 2D flow, exactly the same as an, an airplane. So if it doesn’t work for wind turbines, then it shouldn’t work for airplanes either.

So that’s one fundamental thing. And also at Betz limit, it’s not like it’s not driving design. It’s more like if you, if your design exceeds the Betz limit for a, um, a horizontal axis wind turbine, then you– it’s like a sanity check that you’ve done something wrong. Uh, that’s, that’s what I would say you would mostly use it for.

Um, but what I don’t understand, and maybe Alan, presumably you did read the, read the research or at least the press [00:23:00] release. Are they arguing that y- um, like the tips of a wind turbine blade are rotating, are moving fast enough that it’s approaching transonic flow? ‘

Allen Hall: Yeah, it’s a rental number thing.

Rosemary Barnes: there’s different types of aerodynamic equations depending on how fast the, airfoil’s moving.

And my understanding is transonic is like 0.8 Mach, um, 0.8, which is 274 meters a second, which is more than double what, um, the fastest tip speeds are currently. So I would think that you’re not quite approaching that yet. They’re– It’s not like a cutoff that, you know, all of a sudden at that exact, exact speed the air behaves totally differently.

But, um, y- yeah, like it seems far enough away that it’s not that relevant. But is that what they’re getting

at or, or is it something different?

Allen Hall: I like doing sanity checks when I read things from MIT. So what blade [00:24:00] manufacturers and/or wind turbine OEM has designed a set of blades and go, “Oh my gosh, we’re getting more energy than what we calculated,” and not thought to themselves, “Huh, maybe we should look into that”? It’s, it’s, it’s hilarious almost that all the engineers working in wind for 100 years wouldn’t have stumbled across this, where the turbine produces more power than the Betz limit would say it would.

Y-

Rosemary Barnes: yeah, as many people have commented on, you know, any one of my YouTube videos about wind turbine aerodynamics, if they would just put more blades in there, then, you know, less wind would just fly through without ever being, um, y- without ever hitting a blade.

So, you know, like obviously wind turbine, uh, blade aerodynamics people are stupid because if they weren’t, then they would see that you just put more blades in and you get more, twice as many blades, twice as much energy and w- What about three times as many blades? Three times as much energy.

And I [00:25:00] didn’t even go to MIT and that’s just, you know, like just

brilliant

Allen Hall: Obvious

Rosemary Barnes: off the top of my head here.

Allen Hall: it’s sort of ludicrous, honestly, and I see these things in wind occasionally. I see it more often in other areas, particularly aerospace, where, where you just have to go, “What are we spending time on?

Really? We’re working on this? On a fraction of a percentage point that we may have a slight error in?” Like, it does not matter. What are you gonna do with that?

Rosemary Barnes: there’s two issues. One is that the person writing up the press release is not the person that did the research, and they will always blow it up to be much more groundbreaking than the engineers who actually worked on it probably think it is.

So, the, like, I think you have to, like, reserve your criticism of the work and try and criticize the press release. And then the second error that I commonly see is that people don’t have an un- good understanding of a status quo. So they think that they have smashed the status quo, but really it’s more to do with them not understanding the status quo than it is through [00:26:00] some legitimate, like, massive im- improvement.

So it could well be that this is all very good and correct work, just with limited practical implication. That would be my most expected, um, from this.

Allen Hall: Rosemary, how many times a month do you get queries about wind turbine improvements that are just physically impossible?

Rosemary Barnes: Oh, I mean, if I read all of the comments on my YouTube channel, then probably quite, quite frequently. But, um, yeah, the most common one is just people thinking you can just add more blades and get a proportional increase in, um, in energy, you won’t get more power from adding more blades if that’s the only thing that you do, because in a well-designed wind turbine, which modern ones are, every, e- every air molecule that goes through the rotor disc is gonna interact with the, um, with, with a blade.

That’s how it’s, it’s designed. The blades are moving really fast, and so every molecule doesn’t get hit, but, you know, every, every molecule is affected and has some energy extracted from it. Um, then the other thing is people [00:27:00]who think if you reduce drag, like if you can come up with a lower drag airfoil or a higher lift airfoil, then you think, they think that that relates to more energy proportionally.

So they’re like, “Oh, this airfoil has twice as much lift, so it’s gonna be twice as much power.” It’s like, actually, you know, wind turbine designers are aware of the full range of, you know, airfoils that are available, including high lift ones, and they’re not using it because, you know, the same reason the airplane wings aren’t just, you know, like the highest, highest lift airfoil.

Y- you know, it’s more of a lift to drag ratio type thing, and that’s true for wind turbine blades as well, but also there’s structural considerations probably more so in a wind turbine blade than there are in, um, in airplane wings. So, you know, there’s some sacrifices made for that. Um, yeah, but those are the two, two main families of, of mistakes that I’d say people make.

Allen Hall: So

Rosemary Barnes: Matt

Allen Hall: up to his hand up for

to MIT media representatives

Matthew Stead: uh,

I had a couple of sort of quick and simple points. The first of all, uh, I’m actually a graduate of [00:28:00] MIT. I’ve graduated from, uh, from a course at MIT. Um, so that’s the first thing. Um, not in engineering. Um, the next one is like, so what? I mean, we can’t even reliably measure, um, you know, AEP the other one is all models are wrong.

Yolanda Padron: But not just wind

Matthew Stead: the world is not perfect. All models are wrong, so trying to improve something that’s wrong, you know, might help a little bit, but does it really matter?

Rosemary Barnes: But it is also the job of academics to improve these models. So there’s nothing wrong with MIT spending a lot of energy to, um, you know, improve on an incorrect model with another incorrect model. Uh, if it’s more useful, that’s great, and even if it’s not, like isn’t that the job of

Matthew Stead: yeah.

Matthew Stead: you should add to where it has the most impact on humanity. You should actually put the effort into areas that have a greater impact on pushing the boundary. You know, pushing small boundaries does not help the world

Allen Hall: Matthew is an MIT graduate, [00:29:00] the one thing that Matthew brings to the table is real-world experience. And that if you shelter yourself inside a laboratory at MIT, and I understand why you would do that, because I’m sure it’s a very pleasant place to work, and there’s a lot of benefits to that.

However, the way that MIT used to work back in the day, and not everything was roses then, but oh, okay, y- that people had industry experience. They had a knowledge of what was going on on the ground, and they were engineers, and they realized that formulas and reality don’t always align. And maybe we lost that somewhere in the ’80s and, or ’90s, but it does continue to be a problem, where back to Matthew’s point, if you’re going to use that amount of brain energy, put it to something that can help the world.

This isn’t necessarily helping the world That wraps up another episode of the Uptime: Wind Energy podcast. If today’s discussion sparked any questions or ideas, and I’m sure that it will, we’d love to hear from [00:30:00] you. Reach out to us on LinkedIn, and don’t forget to subscribe so you never miss an episode.

So for Yolonda, Rosemary, and Matthew, I’m Allen Hall, and we’ll see you here next week on the Uptime: Wind Energy podcast.

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Now that it has actually happened, we say that removing Trump from office and sending him to prison is the very best outcome possible.

That’s why 70% of Americans and close to 100% of others in the developed world will rejoice the moment that Trump is no longer a figure in world events.

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