Solar Stirling Engine

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Solar Stirling Engine

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tahir

Joined: 28 Oct 2004
Posts: 45668
Location: Essex

Posted: Mon Jun 06, 05 9:06 am Post subject: Solar Stirling Engine
Anybody seen this before? https://www.sunmachine.de/english/main.html

Blue Peter

Joined: 21 Mar 2005
Posts: 2400
Location: Milton Keynes

Posted: Mon Jun 06, 05 12:52 pm Post subject:

Tahir,

It looks interesting, but as we've found with the rooftop wind turbines, it's really necessary to get some hard data to see if the numbers actually stack up. After all if you need 6 units (@ $5000 + 30% installation costs? or is that for all 6 units?) plus photovoltaics to equal a condensing boiler, then that's quite an outlay, even if it does require less maintenance.

That they're also developing what looks like a wood-pellet CHP unit (I think) is also interesting,

Peter.

tahir

Joined: 28 Oct 2004
Posts: 45668
Location: Essex

Posted: Mon Jun 06, 05 12:59 pm Post subject:

That's the problem with most of these technologies, there's too many grey areas, I reckon it'll be another couple of years before any of these technologies are mature enough for all but the most adventurous to try out.

From alll the discussions that I've had in recent weeks the biggest contribution any household can make to reducing energy consumption is insulation, triple glazing, super insulated roofs, insulated walls and floors, etc.

Blue Peter

Joined: 21 Mar 2005
Posts: 2400
Location: Milton Keynes

Posted: Mon Jun 06, 05 1:10 pm Post subject:
I think that you're right - trouble is, rockwool or cellulose (which are you going for?) isn't quite as sexy as a solar-powered stirling engine with a wood log top up mechanism Peter.

tahir

Joined: 28 Oct 2004
Posts: 45668
Location: Essex

Posted: Mon Jun 06, 05 1:24 pm Post subject:

Blue Peter wrote:

rockwool or cellulose (which are you going for?)

Not that far down the road yet, but it'd be nice to use cellulose or wool

Blacksmith

Joined: 25 Jan 2005
Posts: 5025
Location: Berkshire

Posted: Mon Jun 06, 05 10:46 pm Post subject:
I made a "hot air "engine many years ago, very low power output, saw one at the model engieer exhibition once that would run powered by a bright light shone on to a parabolic reflector Dave

Blue Peter

Joined: 21 Mar 2005
Posts: 2400
Location: Milton Keynes

Posted: Tue Jun 07, 05 10:42 am Post subject:
As far as I can see, that indeed is what this sun machine is. Did your version use a stirling engine? Peter.

Blacksmith

Joined: 25 Jan 2005
Posts: 5025
Location: Berkshire

Posted: Tue Jun 07, 05 12:04 pm Post subject:
It was from a set of drawings in the "Model Engineer" magazine. Opposed crank displacer cylinder one side power cylinder the other side, flywheel was about 4" dia. Powered by a small meths flame. Have seen a larger one at (I think) Kew bridge engines. Dave

judyofthewoods

Joined: 29 Jan 2005
Posts: 804
Location: Pembrokeshire

Posted: Tue Jun 07, 05 9:25 pm Post subject:

I haven't built a sterling engine yet, but tried out two types of parabolic reflectors, one a trough shape, the other a dish. Just held a thermometer inside a black pipe inside a glas tube, no sealing, no water, and I had to pull away the thermometer after a couple of minutes, as the temperature was rising so high, that it was going off scale, which was 110 degrees C, especailly fast in the focal point of the dish. A good way of quickly heating water for a cupa. perhaps a way to save on Camping Gaz when backpacking is to have a Mylar sheet and a way to stretch it over your saucepan and extract the air from the pan with a Vacuvin pump (drill a small hole near the top of the pan, stick a little membrane valve over the hole, attach a ring of innertube to the base of the vacuvin to make close contact). Then hang your kettle on a stick in front of the focal point. A very light way of transporting an additional stove for when the sun is shining. The vacuvin pump and the Mylar sheet would just be a few grams, a lot less than carrying extra fuel, and would last indefinately. Sorry, went off on a tangent there, the idea came to me as I was writing it.

Blacksmith

Joined: 25 Jan 2005
Posts: 5025
Location: Berkshire

Posted: Wed Jun 08, 05 12:10 pm Post subject:
Opposite of a solar still.....sort of.

judyofthewoods

Joined: 29 Jan 2005
Posts: 804
Location: Pembrokeshire

Posted: Tue Jun 14, 05 12:52 am Post subject:
Just found this site https://www.staev.com.sg/stm-engine.asp There is also an interesting page on Ultra capacitors, up to 5000F

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