Gamma configuration stirling engine

The gamma configuration Stirling engine is a Stirling engine in which the working and displacement pistons are housed in different cylinders connected to one another .

The gamma configuration can also be seen as a modification of the beta configuration . There are different opinions when it comes to delimitation. The low-temperature Stirling engines described here are sometimes also viewed as a beta configuration.

Model engines

Low temperature Stirling engines

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Today small gamma configuration Stirling engines are commercially available, e.g. B. operated with the warmth of a palm. The engines are also called hand-warm Stirling or coffee Stirling engines . Body heat or a cup of warm coffee are sufficient sources of energy. If you put ice cubes on the upper plate, the motor also runs with ambient heat. The first authors of the studies on low temperature difference Stirling engines are Ivo Kolin and James Senft. Theoretically, the temperature difference can be just one Kelvin.

Pump design

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Stirling model engines for the desk often use the "pump design". The name comes from the fact that the rocker arm on top is reminiscent of a (hand-operated) pump.

The displacement piston and cylinder can be made of glass or metal and are oriented horizontally. The displacement piston is usually hollow to save weight.

The working piston is aligned vertically and connected to the crankshaft via a rocker arm. A flywheel is also connected to the crankshaft.

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  animation

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  Stirling engine operated with an ethanol burner

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  Stirling engine with glass displacement piston

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  Stirling engine with a hollow metal piston as a displacer

Lying Stirling engine

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In the horizontal design, the working and displacement pistons are connected via a common crankshaft. There is also a flywheel on the crankshaft.

The gas path between the working cylinder and the displacement cylinder acts as a dead volume / dead space .

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Alternative names:

• horizontal Stirling engine
• Inline runner

Other forms

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advantages

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• mechanically easier than alpha and beta type
• Different sized cylinders possible
• Theoretically more efficient due to the larger heat exchange surface.

disadvantage

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• one of the connecting rods must be sealed
• large unused volume / dead volume
• Compression ratio lower than alpha and beta type

literature

• Kongtragool, Bancha, and Somchai Wongwises. "A review of solar-powered Stirling engines and low temperature differential Stirling engines." Renewable and Sustainable energy reviews 7.2 (2003): 131-154.
• Senft, James R. An introduction to low temperature differential Stirling engines. Moriya Press, 1996.

Web links

Commons : Gamma Stirling engines  - collection of images, videos and audio files

Commons : Low enthalpy Stirling engines  - collection of pictures, videos and audio files

Individual evidence

1. ↑ http://www.stirling-fette.de/howdo.htm
2. ↑ animations
3. ↑ Archive link ( Memento of the original from December 29, 2014 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.  
4. ^ "Ever seen an engine powered by a hot cup of coffee? You have now." [1]
5. ↑ Senft, James R. An introduction to low temperature differential Stirling engines. Moriya Press, 1996.
6. ↑ Hog Stirling Motoren, see for example this photo: Commons: File: Stirlingmotor 3.jpg
7. ↑ Boem Stirling Engines
8. ↑ Archive link ( Memento of the original from December 28, 2014 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.  
9. ↑ Archive link ( Memento of the original from December 28, 2014 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.  
10. ↑ Archive link ( Memento of the original from December 28, 2014 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.  
11. ↑ http://www.okofen-e.com/de/stirlingmotor/
12. ↑ http://www.stirling-und-mehr.de/Definition_Stirlingmotor_Ridermotor.html
13. ↑ ^{a b c} Archive link ( Memento of the original from December 28, 2014 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.  
14. ↑ [2]