Category Archives: Stirling Engines

An engine that uses Heat and Cool to create motion

Solar Powered Stirling Engine

Robert Stirling was a Scottish minister who invented the first practical example of a closed cycle air engine in 1816, and it was suggested by Fleeming Jenkin as early as 1884 that all such engines should therefore generically be called Stirling engines. An important consequence of this ideal cycle is that it does not predict Carnot efficiency. Particular details of the receiver are not important insofar as general principles of the present invention are concerned since the receiver is essentially conventional. On top of that you need a low torque alternator-generator with cogging effect at minimum or zero.


He called this cycle the ‘pseudo-Stirling cycle’ or ‘ideal adiabatic Stirling cycle’. Rider’s, Robinson’s, or Heinrici’s (hot) air engine.

The usual tendency to stirling engine design has been to use high temperatures and pressures in order to pursue performance and specific power competitive with conventional systems. This approach results in problems of special materials and advanced technologies. The reflective mirrors are formed into a parabolic shape using stamped sheet metal similar to the hood of a car.  A Stirling engine can function in reverse as a heat pump for heating or cooling. Additionally, the advent of transistor radios and their much lower power requirements meant that the original rationale for the set was disappearing. The revised design also has fewer mirrors — 40 instead of 80. When the working gas contacts the cold side, its pressure drops below atmospheric pressure and the atmosphere pushes on the piston providing more energy to the generator.

Available power is 52 kW a shutter is available to adjust power
Available power is 52 kW a shutter is available to adjust power

Free Energy Nitinol Heat Machines

2D view of nitinol’s crystalline structure during cooling/heating cycle

Invented in the early 1959, Nitinol alloys exhibit two closely related and unique properties: shape memory and super-elasticity. Shape memory is the ability of Nitinol to undergo deformation at one temperature, then recover its original, undeformed shape upon heating above its “transformation temperature”. Superelasticity occurs at a narrow temperature range just above its transformation temperature; in this case, no heating is necessary to cause the undeformed shape to recover, and the material exhibits enormous elasticity, some 10-30 times that of ordinary metal.

An Alternative-Energy Machine that can run on virtually any type of Fuel

Dean Kamen doesn’t think small. He’s known to most of the world as the inventor of the Segway, but his idea to revolutionize deka-research-stirling-engine transportation is peanuts compared to his other successes in the medical devices field, science and engineering education, and water purification technology. And if that sounds eclectic, it’s only the beginning of Kamen’s far-reaching and ambitious list of projects. The latest is an energy generator that promises cleaner, more flexible and always-available electricity. Kamen already has a prototype version, and he wants to work with the telecommunications industry to make it commercially viable.

So what is Kamen’s great new invention? It doesn’t have a name yet, but Kamen refers to it as a Stirling engine. Stirling engines were introduced in the 19th century, but have had limited practical application since then, largely because of cost issues.


Six Candle power Stirling Engine

six-candle-power-stirlingAdded PDFs at bottom of post.

Thanks approtechie For posting this to YouTube this is a 6 candle Power Stirling Engine. As in an earlier post I explained that a Stirling Engine takes a heat source and a cold source and converts that into mechanical energy. Ideally you would want to use hydrogen or helium as the gas that fills the engine, because of their ability to absorb and conduct heat but most Stirling engines use the air we breath as the gas medium. The air is heated and it expands then a displacement piston moves the hot air to the cold surface and it contracts causing a vacuum. This moves the displacement piston the other direction and the process starts all over again.

Here is a PDF on Air Engine’s , Plans for small Stirling Engine.

The build

Energy Conversion Conundrum

I  Started this blog to help get the word out about Energy Conversion. It has always bothered me that they teach us that “You Can’t Get more energy Out than You Put in” . Well Alpha_StirlingMy response  to that is “Then Ex-plane the Sun, Nuclear Weapons, and Refrigerator Magnets”.   They can’t  using the laws they have created. Its really a Lot easier than they make it sound. The Secret is Quite Simple 90 ° (90 degrees), take for instance the Stirling Engine the one here has the pistons at a 90° angle. It takes a heat Source and a Cold Source and turns it into mechanical energy to run Quite a few things, in the early 1800’s an engine built by Stirling was employed pumping water in a Quarry. That was almost 200 years ago. Now we have solar Stirling engine’s that are 80% more efficient than Solar panels