Stirling Engine - unique use

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Stirling Engine - unique use

#1  Postby Macdoc » Apr 14, 2018 11:53 am

Sweden beats up on the US Navy

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Re: Stirling Engine - unique use

#2  Postby laklak » Apr 14, 2018 3:23 pm

I'm fascinated by Stirling engines. If I had the money I'd try to install one in the trawler. Don't need high rpms, and cruising speed is only around 8 knots. There should be plenty of temperature differential between the surrounding water and engine heat source. Alternatively use one for power generation. I've got an 8kw diesel generator but it's too loud to run when at anchor, plus I don't like running a diesel while I'm asleep. This means no A/C when anchored, which can get a bit sticky in the summer. There are a couple of companies producing small Stirling gennys.
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Re: Stirling Engine - unique use

#3  Postby Fenrir » Apr 15, 2018 1:27 am

laklak wrote:There are a couple of companies producing small Stirling gennys.


Got names or links?
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Re: Stirling Engine - unique use

#4  Postby laklak » Apr 15, 2018 3:23 pm

There are a few on Alibaba, but no idea how good they are.

https://www.alibaba.com/showroom/stirling-engine-generator-10kw.html

Can't find a marine version.
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Re: Stirling Engine - unique use

#5  Postby Fenrir » Apr 16, 2018 10:55 am

Interesting. I've only seen the toy versions.
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Re: Stirling Engine - unique use

#6  Postby zulumoose » Apr 17, 2018 6:22 am

Those are not Stirling engines:-

"single-cylinder, vertical,4-stroke air-cooled diesel engine - Combustion System Direct Injection "

From what I understand, Stirling engines are so low power for their size, weight, and the fuel consumption required to generate the heat that they are not economically viable, and only have niche uses.

They do have unique advantages in that they can harness energy from heat differentials, however produced, and do so quietly without waste products, but usually not on a useful scale, and the heat differential would need to be already existing, as in a by-product of something else, in order for it to make sense.
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Re: Stirling Engine - unique use

#7  Postby laklak » Apr 17, 2018 1:36 pm

Well shit, I didn't read through the technical data. So they're lying asshats then. Or maybe they called their company "Stirling engine"?

Looks like I'll have to build my own. Here's a link to a company supposed to be building 1kw gennys, which isn't enough for my applications.

[url]https://sunpowerinc.com/1kw-stirling-engine/
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Re: Stirling Engine - unique use

#8  Postby zulumoose » Apr 17, 2018 2:42 pm

I didn't read through the technical data. So they're lying asshats then


Reading Chinese specs is often very frustrating, because the people who draw up the documents in English don't know what is going on, and you usually find contradictions and things that make no sense whatsoever. The responses to queries on sales sites are very often laughable.

Hard to know what you are getting unless you participate in an enthusiasts forum where people are discussing what they actually received from these companies and how they rate the performance against benchmarks.
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Re: Stirling Engine - unique use

#9  Postby Fenrir » Apr 17, 2018 8:59 pm

Yeah. Funny how there's all these people claiming all these wonderful things but nothing ever seems to eventuate.
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Re: Stirling Engine - unique use

#10  Postby The_Metatron » Apr 17, 2018 10:03 pm

From what I’ve learned bout Stirling engines, they aren’t well suited to modulating their output power. They just don’t respond quickly to throttle inputs.

They are an integral part of my proposed system of meshed electric power buffers to make possible widely distributed power generation. I’m not pleased with the inefficiencies of the system, though.


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Re: Stirling Engine - unique use

#11  Postby laklak » Apr 20, 2018 6:50 pm

The more I think about it, diesel or Stirling electric is probably the way to go, should I ever have an opportunity to build a boat. I like the idea of 100% torque at any prop speed, and near instant prop reversal at any speed. Can't do that with direct to shaft diesels, got to get the RPMs down before shifting or you'll have a big mess of metal chunks and gear teeth to deal with. Single engine/generator, two drive motors, variable pitch props, that's the ticket. Could add solar to the mix if there was enough battery storage capacity.

Good article on marine diesel/electric propulsion systems for smaller boats:

https://www.yachtingmagazine.com/diesel-electric-drive

Never gonna sound like my Detroits @ 1800, though.
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Re: Stirling Engine - unique use

#12  Postby The_Metatron » Apr 20, 2018 7:59 pm

Detroit 6.5?


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Re: Stirling Engine - unique use

#13  Postby laklak » Apr 20, 2018 8:09 pm

Two 1984 6V53 Turbos, 5.2 litre. Rated 320hp@2800, but I rarely take them over 2000. Got 2600 hours on each, should be good for another 8000 hours or so before a major rebuild.

They've got a nice rumble.
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Re: Stirling Engine - unique use

#14  Postby Macdoc » Apr 20, 2018 8:59 pm

this is the ticket

put some hydrofoils on it

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Re: Stirling Engine - unique use

#15  Postby laklak » Apr 20, 2018 9:23 pm

That looks like fun, but with a top speed of about 15 knots I doubt she'd get up on plane.
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Re: Stirling Engine - unique use

#16  Postby The_Metatron » Apr 21, 2018 12:26 am

laklak wrote:Two 1984 6V53 Turbos, 5.2 litre. Rated 320hp@2800, but I rarely take them over 2000. Got 2600 hours on each, should be good for another 8000 hours or so before a major rebuild.

They've got a nice rumble.

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Re: Stirling Engine - unique use

#17  Postby Thommo » Apr 21, 2018 12:49 am

That video in the OP is amazing. Fascinating.
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