2 KWh LTD Stirling Engine

Discussion on Stirling or "hot air" engines (all types)
Aviator168
Posts: 308
Joined: Tue Feb 08, 2011 2:29 pm
Location: Brokeville, NY. USA

Re: 2 KWh LTD Stirling Engine

Postby Aviator168 » Thu Feb 02, 2017 7:07 am

Here is the problem Ian. WhisperGen is $20K. Their justification is that 1kW ELECTRICAL output. Most of the fuel is used to produce heat/HW and I can get an 30 gallon oil fire HW burner for less than $600, and on demand ones are much less. To me, it is a scam.

Ian S C
Posts: 1937
Joined: Thu Dec 02, 2010 5:15 am
Location: New Zealand

Re: 2 KWh LTD Stirling Engine

Postby Ian S C » Fri Feb 03, 2017 3:17 am

Fuel is much more expensive in Europe where the target market for the Whisper Gen is, so is main grid power. When it was first marketed it was cheaper to run a home in Germany or UK on the Whisper Gen, and sell the surplus to the state generator. I'm not in contact with Whisper Tech now as it is no longer in New Zealand, the earth quake of 7 years ago demolished their HQ here.
Ian S C

Aviator168
Posts: 308
Joined: Tue Feb 08, 2011 2:29 pm
Location: Brokeville, NY. USA

Re: 2 KWh LTD Stirling Engine

Postby Aviator168 » Fri Feb 03, 2017 4:15 am

That does not make sense Ian. If the real situation is what you described, should WhisperGen be more efficient in the production of electricity? As I say, its electricity generation efficiency is less than 10%. The rest is heat and you can't sell heat back to the grid.

Hutch687
Posts: 6
Joined: Thu Jan 26, 2017 10:41 am

Re: 2 KWh LTD Stirling Engine

Postby Hutch687 » Mon Mar 27, 2017 10:38 am

So I have finally discovered the inner working of the Sunpulse Stirling Engine.

https://www.youtube.com/watch?v=mpBa0nt ... ture=share

I have one new problem I discovered which is that I cannot run the "cold" pipe through my pond without it freezing in winter. So I have decided to dig a 10 foot deep trench to bury it in. How long do I need to run this pipe for so that the water cools from ~120F to ~60F by the time i am pumping it back into the Stirling Engine cooling tubes?

Could I just bury it in a large 10 foot x 20 foot rectangle and run the pipe zigzag throughout? Or would the ground get too warm over time from it running 24/7?

Ian S C
Posts: 1937
Joined: Thu Dec 02, 2010 5:15 am
Location: New Zealand

Re: 2 KWh LTD Stirling Engine

Postby Ian S C » Wed Mar 29, 2017 2:30 am

If you bury it too deep you will if you just pump it round will find that the temperature rises, pumped buried water pipes are used for house heating systems. Could you use anti freeze in the cooling system and circulate that in you pool, depending on the size of the pool, and the motor you might even get the pool temperature to rise a degree or so.
Ian S C

Hutch687
Posts: 6
Joined: Thu Jan 26, 2017 10:41 am

Re: 2 KWh LTD Stirling Engine

Postby Hutch687 » Wed Mar 29, 2017 10:18 am

actually that should work quite well. dont know why i didnt think of it. i think i just had my brain too focused on pumping water. thanks.

Aviator168
Posts: 308
Joined: Tue Feb 08, 2011 2:29 pm
Location: Brokeville, NY. USA

Re: 2 KWh LTD Stirling Engine

Postby Aviator168 » Thu Mar 30, 2017 6:29 am

Hutch687 wrote:So I have finally discovered the inner working of the Sunpulse Stirling Engine.

https://www.youtube.com/watch?v=mpBa0nt ... ture=share


No magic there. The trick to LTD stirling is to have very very large exchange area, lots of working fluid, and minimum amount of non-working fluid.

P.S. In my book. Working fluid is the amount of fluid that can actually go through the heat exchangers.

How long do I need to run this pipe for so that the water cools from ~120F to ~60F by the time i am pumping it back into the Stirling Engine cooling tubes?

You should be able to figure that out
https://www.youtube.com/watch?v=QMg3vr7KgDA&t=385s

andonrangelov
Posts: 6
Joined: Fri Apr 14, 2017 8:49 am

Re: 2 KWh LTD Stirling Engine

Postby andonrangelov » Fri Apr 14, 2017 9:29 am

Hi Hutch687,
Indeed I was thinking for the same idea of using solar evacuated tubes in combination with Stirling engine so I am very interested of your progress.
Up to now what I have in mind is to have such a setup for the solar evacuated tubes
https://www.youtube.com/watch?v=6Eh4a2nYWpg and then use the hot plate to put one large LTD Stirling engine like “Sunpulse”
Another possibility for me is to use many small LTD Stirling engines in series. What I mean is to use the following setup https://www.youtube.com/watch?v=Z5L2KK1JBCc (or this one https://www.youtube.com/watch?v=vT1VaSL_Z5M&t=0s ) but instead of one vacuum tube to use 10 ~100 and the same amount of Stirling engines in series.
Let me know the progress of your project.

Ian S C
Posts: 1937
Joined: Thu Dec 02, 2010 5:15 am
Location: New Zealand

Re: 2 KWh LTD Stirling Engine

Postby Ian S C » Sat Apr 15, 2017 3:47 am

A much higher temperature can be had by using a suitable reflector/mirror directly on the hot cap of the Stirling Engine, a large Freznel Lens will generate enough heat to etch stainless steel, only problem (in this part of the world)is to get the sun to shine at the right time.
Ian S C

zahidr1000@gmail.com
Posts: 2
Joined: Mon May 01, 2017 7:27 am

Re: 2 KWh LTD Stirling Engine

Postby zahidr1000@gmail.com » Sat May 06, 2017 11:17 am

I want to build same engine. Have you made any progress on it. Will you share it with me ?


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