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Um... why not both? No reason, just my experience that maybe 1% of these grand ideas actually amount to anything being built, much less working, so keeping it simple and focused on practicalities is good. But, this is a Stirling engine forum, so if this person is driven to build a heat engine for p...

Um... why not both? The heating/cooling loops would only need a trickle of water to be effective. Take the normal streams and do the micro hydro, and pull off the heating/cooling trickles to create the proof of concept (and make yourself famous)! I would love to hear the opinions of those on this si...

Howdy All! I love this David! This is exactly what I posted this for! Please keep us up to date! I'm the idea guy, but not the expert. I'd suggest making any Stirling engine (even a model engine) run with this temperature different as a proof of concept. Also, here's a potential way to increase the ...

I'm glad that I'm not the only one who's trying to tap energy from a compost heap with a Stirling engine. Me too! Go get 'em! The goal is NOT making compost a major power source of electricity, but to turn it into an efficient heat source for household heating while producing fertilizers Brilliant ...

^^ To my knowledge the project is at a complete stand still. Not a good sign. Good to know, but that's unfortunate. Much better energie options available, hemp and alcohol only two of them. Dont get much greener than hemp, sugar cane or fruit trees. I respectfully disagree burning anything is green...

If the company no longer exists, are the designs and/or patents public domain? How would we check that? But the reality is the company how made the SunPulse SP-500 no longer exists and as far as I know the claimed power was never independent verified. The engine has a diameter of 1300mm (51 inches) ...

A system of the sort proposed here is apparently in production in Sweden. With a capacity of "23,000 Stirling engines anually on the current production line." https://youtu.be/LsTYALSu56E These appear to be Alpha type engines, heated with a heat transport fluid (liquid sodium) circulated ...

While this has become a great discussion of low temp differential Stirling Engines, I feel it's kind of strayed off the original topic, which is adding a cooling loop and heating loop to a Stirling Engine to maintain the cold and hot temperatures of each respectively. While the P-19 is an innovativ...

While this has become a great discussion of low temp differential Stirling Engines, I feel it's kind of strayed off the original topic, which is adding a cooling loop and heating loop to a Stirling Engine to maintain the cold and hot temperatures of each respectively. While the P-19 is an innovative...

Fair enough! :)

I'd probably put a copper coil of pipe to form a chimney up the center of the pile. horse-manure-a-renewable-resource-swinker-29-728.jpg Image source: slideshare.net/heyboerg/horse-manure-a-renewable-resource-swinker I used to use a length of perforated sewer pipe just to vent the pile. Hm... I won...

A rather long, detailed study on heat from compost as an energy source can be found here: https://www.hindawi.com/journals/ijce/2010/627930/ At the end it concludes: "It can therefore be concluded that collecting the waste heat of compost through a heat exchanger is a realistic solution to con...

That's the strength I see of this - the ∆T comes from two theoretically inexhaustible sources - the mountain stream, and the well tended compost heap. Whoa! The stream is a great source of cooling, but the compost heap not so much, nowhere near to inexhaustible in fact! The point is that you need t...

The point of using tarmac is the heat retention of the tarmac. Think of it as an equivalent to "cold retention" of a running stream of water. If you had pipes snaking through or under the < insert thing that gets hot but releases heat slowly here >, you could use water or some other coolan...

What would be good sources of heat then? I'm thinking a large basalt slab painted black - or a stretch of road that stays in the sunlight most of the day.