The document summarizes the Stirling engine, a heat engine that converts heat into mechanical work. It discusses the types of Stirling engines including the alpha, beta, and gamma. The key components are described as the regenerator, power piston, displacer, crankshaft, and flywheel. Applications include electricity generation, heating and cooling, and marine propulsion. Advantages are high efficiency and ability to use various heat sources, while disadvantages include high initial costs and inability to instantly change power output. In conclusion, Stirling engines offer applications but are expensive to build and rarely used commercially for power generation.

1. STIRLING ENGINE
GUIDED BY:
Amijith A M
Lecturer
Department of Mechanical Engg.
PRESENTED BY:
SANJITH B S
Sememester - 5
Department of Mechanical Engg.

2. CONTENTS
• Introduction
• Types of stirling engine
• Components
• Working
• Alpha Stirling Engine
• Beta Stirling Engine
• Gamma Stirling Engine
• Application
• Advantages
• Disadvantages
• Conclusion
• Referances

3. Introduction
• Stirling engine is a heat engine
• Converts heat energy to mechanical work
• Developed and patened in 1816
• Inventor : Robert Stirling
• Works on any heat source
• It is vastly different from IC engines
• EC engine
• Closed working cycle
• Works on temperature difference

4. Types of stirling engine
The three major types of stirling engine are -:
1. Alpha Stirling Engine
2. Beta Stirling Engine
3. Gamma Stirling Engine

5. Components
• Regenerator
• Power Piston
• Displacer
• Crank shaft
• Flywheel
• Heat dissipation Fins

6. Working

7. Alpha Stirling Engine
Cold air
Regenerator
Heat source
Hot air Crank shaft

8. Alpha Stirling Engine
4 Strokes -:
1. Expantion
2. Transfer
3. Contraction
4. Transfer

9. Beta Stirling Engine
Hot end of
cylinder
Cold end
of cylinder
Power
Piston
Displacer
piston
Fly wheel
Cold gas or air
Hot gas or air
Fins for
cooling

10. Beta Stirling Engine

11. Gamma Stirling Engine

12. Application
• Electric generation
• Prime mover
• Micro-CHP
• Nuclear power plants
• Heat pump
• Water pump
• Cryogenic refrigerators for missile guidance (below 150 K)
• Ideal for use in domestic homes (1KW,50Hz)
• Submarines (The Gotland-class submarines of the Swedish Navy)

13. Advantages
• Can use any heat source
• More thermal efficient (approx: 40% vs modern engines 20-25%)
• Less pollution (also less noise)
• Can generate AC power
• Simple working priciple
• Simple design
• Can be a replacement for steam turbines and
steam engines
• Low power densities

14. Disadvantages
• Initial capital is high
• Change their power output levels slowly
• Heavier (and more expensive)
• A Stirling engine cannot start instantly

15. Conclusion
• Have a range of applications
• They are often expensive to build
• Have rarely been used in commercial power generating
systems.
• The Stirling engine is the interesting alternative way to
commercialize the waste heat.
• One of the ways to increase the effectiveness is to find
the optimal mechanism to gear the engine pistons and
optimize its parameters (dimensions).

16. References
• www.wikipedia.org/wiki/Stirling_engine
• www.sciencedirect.com/topics/engineering/stir
ling-engine
• www.auto.howstuffworks.com/stirling-
engine.htm
• www.seminarstopics.com/pollution-less-
engine

17. Thank you

18. Q