Rhombic Drive Stirling Engine Part 4

[7880ivan]

That is a nice engine. I had an idea about using a refrigerant like ammonia or freon in a sterling engine, incorporating expansion valves to change the freon from a super heated liquid into a gas utilizing the refrigerants to make the engine more efficient. If the resistance in the engine is minimal enough I believe this engine would be able to pull the heat from our environment as its fuel source.

[jamesdixon206]

Hello,

How big is the engine roughly?

We are looking to design and manufacture one of our own and we are having some trouble getting the geometries to work with the gearbox!

Thanks!

[MilanKarakas]

Good! All your videos are amazing.

[PinellasPatriot]

That is an elegant machine! I'm glad to have found your channel.

[heatherroseisrflyer]

Are the power piston and displacer bore and stroke the same?

[barumman]

@heatherroseisrflyer Hi, Yes :)

[johnboy75757]

Brilliant, thanx for posting all of this!

[SWINGREGORY]

this one is soo cool that you should sell this one

king regards

[OgeronimonominoregO]

Great work! The people with the big bucks making the large solar concentrators have developed these to output 3, 10, and even 25 KW! They use helium or hydrogen, and of course a tremendous amount of solar energy is focused on them. If someone like you could develop a 2 or 3 KW unit for solar, there would be a very large market for that in the near future, I think, because it's quite simple to generate solar thermal but not so simple to convert it to electricity. It's a wide open market.

[Aliian7777]

Congratulations on such a fine looking and performing Stirling engine.

Can you explain the operation of the radiator and fan (from a photocopier or similar?). Does it operate all the time or is it triggered by a thermostat and where does it draw power?

Thanks again for all your videos, they are inspirational.

Regards, Aliian7777

[barumman]

@Aliian7777

Thanks for the comments, It isa tangental fan driven continuously

by a belt from the the engine as is the coolant pump.

There is no thermostat. :)

[007TruthSeeker]

Thanks so much for these videos.

Great job making and testing your engine.

[littellam]

i want one!!!!!!!!!!!!!!!

[amfan12]

Have you tried using higher pressure, like from a a CO2 tank?

[barumman]

@amfan12

Hi, If I used more pressure I would also have to increase the heat input, there is a piont where the heat exchangers become inefficiant so there is no gain.

Thanks for taking an interest, Cyril :)

[SWINGREGORY]

great

[lezbriddon]

what is the heat source?

[KyleWGlenn]

Barumman,

How air tight is your system? If it can respectively maintain its pressure over time, how did you seal it? Gaskets? Insanely tight tolerance metal to metal fit?

[barumman]

Sealing is mostly by O rings including the shaft seal.

[seba510]

It is very great works,send one's greetings from Poland :-)

[565Customz]

could you go into detail on how it actually works? especially the part on how you made it a refrigeration device

[KyleWGlenn]

@565Customz That question takes a monumental amount of explanation. Pick up a Thermodynamics book, it should help.

[IkkFedt]

I'm absolutely hooked on this engine, but i was wondering how you machined all the parts.

-Thpmas

[barumman]

With difficulty !  :)

[DNM35]

a true work of art!...would be excellent as a portable power source on a camp outing.

[studioLivingDead]

Your work is brilliant and truly inspiring.

200 year old technology having a rebirth.

It's time to go electric.

What is the displacer made from?

[barumman]

Thanks for the kind comments, Stainless steel displacer  :).

[Ricbordenave]

You are my first "Stirling Hero"!!! Thanks a lot!!

[hdkivela2]

Professional work!

[777strongcoffee]

Fantastic video! Thanks for walking us through your test; and especially about pressurization. I liked seeing real test results, not just something spinning free with no work being done.

[ricande]

A tip fot the future: Take the camera of the pod. Love your videos.

[mixanthony]

BEAUTIFUL, BEAUTIFUL, did I mention BEAUTIFUL? This is by far the best and most informative video on stirling engines I've ever seen. Great example of pressurizing!!!!! Good work!!!

[barumman]

Thanks for the kind comments.

[afleececooper]

Brilliant work, very very impressive,

Amazing to see just how much difference the pressure makes!

AC :)

[barumman]

Thanks

[d3adp001]

how much fuel (by wieght) did it consume per minute?

And what was the fuel.

[barumman]

Sorry have not done any fuel test, Propane

[d3adp001]

any plan on doing it?

[barumman]

Not at the moment, I seem to be lacking enthusiasm due to the poor power output. :)

[szym86]

To get more RPMs you pressurize crankshaft box and cylinder also ??

[barumman]

Yes.

[x65535x]

I don't suppose you would make a set of parts for assembly for a few bucks. That is very nice, I just don't have the machinery to fabricate the parts.

[barumman]

Sorry, no

[randommagnum]

Do you have any ballpark estimates as to how many BTUs you are putting into the system?

[barumman]

No ,sorry

[shawnplr]

It would be nice to see the result of using an old refrigerator pump to evacuate it, then pressurizing it with helium. Helium being an excellent conductor of heat second to hydrogen (yet non explosive).

[barumman]

Hi Shawn, I have run it on Helium and it was quite powerful, the problem with Helium is that due to the small atoms it is hard to get it to stay in the engine, it leaks through all the seals and joints whereas air will stay in there for days.

[shawnplr]

Thank you very much for the quick response and insight. Your videos and diligent responses have been very helpful and even inspiring. I am working on a wood gasification and a solar model.

[diymania]

Was the battery weak or is the motor/generator not strong enough to turn the engine under pressure ?

I´m gonna build a stirling engine using two 12v air compressor pistons and cylinders for power piston to compensate for their small size, then try to make the displacer and a rhombic drive, i´ve drawn a rough sketch of my idea.

[barumman]

The engine is very hard to turn over when pressurized due to the reletively high compression ratio

[jman5630]

i love this kinda stuff...it makes my day. my grades in school are gonna prohibit me from going to college to learn about this kinda thing, but maybe i can go for just the electronics part. i hope that one day i will have learned enough to be as cool and as talented as you with this sort of thing. my grandfather was a community college professor, and did close to this kinda thing all the time. i wish i could live up to you both.

thanks for the great videos!

[martinrepublic]

Instead of taking away valuable opportunities, our school systems should be providing them. It is this kind of unfair situation, where the way that the system is oriented prevents students from accomplishing great things like this, that we should be working against. But for the meantime, all we can do is overcome the obstacles in front of us no matter what form they take so that we can achieve amazing things. Follow that passion.

[ozykiss]

Charge with He @145 PSIG and you should be looking at around 2,500 RPM and 200 Watts Electrical out.

Love to see this engine going !

[conasme]

Hi, i´m a Student in Mechanics Engineering in Venezuela. I´m designing a Stirling engine for my thesis. I´m thinking about a Beta configuration with rhombic drive for the basic design. I will be very grateful if you could help me achieve this goal , since nobody here in Venezuela knows about stirling engines and there are very few books related. Once again i really appreciate if you could help me. i'll be waiting for your answer

[diymania]

I´d love to see this engine in person.

[kettrinboy]

thats a very interesting engine, when i can get my head round how a rhombic drive works i,ll stop messing around with scotch cranks, ross yokes etc and make one for myself

[Teploysila]

It ipresionante! Profisonal Great!1/11/2008

[mowerofdoom]

Yep. Best engine around and the most interesting to watch running, especially as it is producing useable power. Can't wait for the next installment!

Kind regards, Geoff.

[IronGoober]

I agree with the comments below, this has got to be the best engine on youtube. And I also want to thank you for taking the time to upload these videos. I'm always anxiously awaiting your next! I hope you get as much enjoyment making them as I get from watching them!

[electrique527]

Hi again!

Nice to see you still work on it, good work!

So electrical output is around 30 watts?

Heat input from a camping gaz burning is in the order of 1000 Watt. If so, you are at 3% overal electrical efficiency, which is not bad at all!

Efficiency of the engine alone could be around 5 to 6 %. Curious to how much you actually achieve.

Let us know, please!

Richard

[mytickets]

Cool

[mytickets]

Very nice engine,Think I could hook that to a fresnel magnifying lens to give it power.How about runing my hydrogen cell i need about 12 volt 4.5 amps to give me the power needed

.Lets build a hydrogen engine Proto type out of plactic , a tube 12 inch long, a piston 2 inch dia,water as a flash back at bottom of tube a spark ,Send the piston up to top of tube with the hydro!!?Thanks Jeff Machinist Arizona USA

[asconaracing]

Impressive, as usual.

Keep up the good work!

[4Mengineering]

Simply glorious!

[digits1000]

This is outstanding! Thank you for taking the time to do this. I look forward to more of your videos.

[joekirklin]

This is great! I'm very impressed with this project and I look forward to seeing your progress.

[kheston]

This is arguably the nicest stirling on YouTube. Really, really nice work! I'm quite envious, honestly.

You appear to producing ~27 watts. Have you compared that to your fuel expenditure yet?