Bill Haynes wrote:Well...
Stirling engines larger than tabletop models are not available and actively discouraged from being marketed, in the USA, so you need to be a machinist to bring this to fruition.
But the idea is sound. Added efficiency could be found by putting the cold end in a heat sink, (pond) or having a water source cascade over it, sort of creating a vacuum engine.
Another scenario is using hot glycol in a boiler configuration and having a Sterling engine as the first heat sink, then running it through a domestic water heat exchanger, as a second, and finally through a radiator in a green house, or as a glycol to air heat exchanger in a forced air furnace, or into a concrete flooring, set the flow so it scrubs heat from 200 Fahrenheit to 80 at the end of the process, and then cycle the cooler fluid across the cool end.
Twenty five years ago there was a five hp unit marketed out of Kennewick WA. but they would not sell it here and for info on it they referred you to a chinese firm.
Do they sell them in Russia? or anywhere else for that matter?.....All I find on the net is fractional hp units
Eric Hanson wrote:Myron,
Sterling engines can be quite effective but at higher temperatures and pressures. There was a Sterling engine built in the US in the 60s? That was designed for undeveloped countries lacking infrastructure. Essentially, the idea was that they could be plopped on a fire and generate electricity. The idea was sound but failed due to a number of technical difficulties.
It is an interesting idea though.
I suggest the TEGs because of their lack of moving parts and ease of installation and operation. Your overall concept can be achieved using TEGs. You can buy TEGs for reasonable prices at a website I found called Tegmart.com (I am sure there are other sources as well).
TEGs do not have the same inherent efficacy of a Sterling engine, but their ease of setup can sometimes make up the difference. Also, TEGs are presently commercially available as opposed to Sterling engines. However, if you the ability to make a Sterling engine, you might be able to do some interesting stuff.
This is an interesting thread and I would love to hear how your plans develop. Please keep us informed.