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vegplot
Joined: 19 Apr 2007
Posts: 21301
Location: Bethesda, Gwynedd
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Hairyloon
Joined: 20 Nov 2008
Posts: 15425
Location: Today I are mostly being in Yorkshire.
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Lorrainelovesplants
Joined: 13 Oct 2006
Posts: 6521
Location: Dordogne
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 Posted: Wed Oct 28, 09 3:07 pm Post subject: |
 
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I think you have to look at why you are burning so much gas, what your house insulation is like, your state of dress as you walk round the house, and what alternatives you have.
Our LPG bill was �2500 per year, and that was for hot water and CH (we have no access to mains gas).
We have reduced this now to �600 per year (same house). We still have the LPG (its for baths, really cold snaps and early morning heat only)
We installed a new woodburner with back boiler and this does our Living room heat, radiators in the 3 beds and bathroom down the hall, and gives me hot water in the evening to do the dishes (3rd tap on sink).
Our wood is nearly free.......we use 5 tons a year, this keps us toastie warm. We had cavity wall insulation in the whole house for les than �100 (grant aided), and have heavy curtains on the one draughty door, and wear jumpers and socks (as well as usual cothes)round the house.
We'll recoup the cost of the new woodburner in less than 2 years.
I'd rather spend the money on other things. |
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vegplot
Joined: 19 Apr 2007
Posts: 21301
Location: Bethesda, Gwynedd
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Behemoth
Joined: 01 Dec 2004
Posts: 19023
Location: Leeds
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Hairyloon
Joined: 20 Nov 2008
Posts: 15425
Location: Today I are mostly being in Yorkshire.
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RichardW
Joined: 24 Aug 2006
Posts: 8443
Location: Llyn Peninsular North Wales
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Hairyloon
Joined: 20 Nov 2008
Posts: 15425
Location: Today I are mostly being in Yorkshire.
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Tom Booth
Joined: 06 Jan 2025
Posts: 4
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tahir
Joined: 28 Oct 2004
Posts: 45685
Location: Essex
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Mistress Rose
Joined: 21 Jul 2011
Posts: 16027
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dpack
Joined: 02 Jul 2005
Posts: 46269
Location: yes
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Tom Booth
Joined: 06 Jan 2025
Posts: 4
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| Posted: Fri Jan 17, 25 5:09 pm Post subject: |
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| dpack wrote: |
very nicely made
it seems to have lots of wires, does it make leccy as well as turn a wheel?
maybe the wires are control sensor links, they look thin for power output? |
The bunch of thin wires are thermocouples.
| Quote: |
if it does not work it should be fairly easy to get it working as it looks "new" and un-degraded by time etc
be careful with precision engineering
it seems chunky so it might produce a decent amount of usable energy from enough low grade heat, be that solar or other source, to give the right temp at the hot side |
It's intended use was for concentrated solar, as in the video. Very high temperature concentrated solar using a large parabolic dish (about 15 foot diameter or 160 square feet). The receptor area is only about the size of a baseball, so the input heat needs to be very concentrated and VERY hot about 800 suns, (potentially up to 3600°Fahrenheit)
I originally got it thinking I might run it on the top of my wood stove but so far I haven't been able to get the hot end up to "operating temperature" (minimum about 1200°F) by any normal heating appliance. Like an electric stove top burner on high.
The problem is, It needs a water cooling system running to keep the electronics cool so a lot of heat goes into the cooling system. So, I've managed so far to make a lot of hot water, but that is about all
Maybe not really a very practical design for a CHP system, though it was tested for that by the army, but strangely, once running, the heat is converted to electricity 3000 watts, and that keeps the engine running relatively cool, so it did not produce enough hot water.
It is difficult to find any documentation, so what information I have comes from old published online news or magazine articles. This one in particular is pretty informative:
https://www.machinedesign.com/markets/energy/article/21831691/infinia-uses-stirling-cycle-for-solar-power-and-air-conditioning
The production of these was going to be funded by some government fund to help bail out the auto industry. The funding was going to pay the auto makers to build these solar Stirling engines instead of car engines.
But then, suddenly the program to bail out the auto makers was canceled and the company making the Stirling engines declared bankruptcy. The existing engines already produced were sold as scrap and the operating instructions withheld.
Now the engines are being used to run compressors to open and close valves on gas pipelines in remote locations.
The engines can run 25 years without maintenance.
https://youtu.be/2Yzeo4JrsNs
So, without the mass production that could have been provided through the established auto industry the cost of production is higher than it might have been.
The engine I have, that you see in the photo was a production model that was sent to a university in Denver Colorado, I believe, for evaluation and testing, then it went into storage and was forgotten, apparently.
From what I've been able to find out, which isn't much, all the others that were produced were destroyed, sold as scrap metal.
I'm rather astonished that with the intended high heat input, this engine only requires a rather ordinary automotive type cooling system. I have to assume, once up and running, the conversion rater, heat to electricity is very high.
The above video is just clips I took from some other much longer interviews. Links are also in the description:
https://m.youtube.com/watch?v=CoC_n-BYPJ4&t=0s
https://m.youtube.com/watch?v=y557uXBRkVg&t=0s
If the funding had not been pulled and these had gone into mass production, I imagine the cost of these engines would be way down by now. They are actually, in many ways, much much simpler than any automobile engine and can run for decades with zero maintenance.
It appears that the one I have was never used, just tested at a university. So it should have 20 years or more life left, if I can get it running
It is supposed to be self starting if it can be gotten hot enough.
I think a direct gas flame might do it, as these were originally used with propane and are now still being used on gas pipelines. |
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Tom Booth
Joined: 06 Jan 2025
Posts: 4
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Tom Booth
Joined: 06 Jan 2025
Posts: 4
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