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The Stirling Cycle

The Stirling Cycle. Kyle Spengler. The Stirling Cycle. Process 1-2: Isothermal expansion 2-3: Constant-volume cooling 3-4: Isothermal compression 4-1: Constant-volume heating. http://en.wikipedia.org/wiki/Stirling_engine#The_Stirling_cycle. The Stirling Cycle.

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The Stirling Cycle

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  1. The Stirling Cycle Kyle Spengler

  2. The Stirling Cycle • Process 1-2: Isothermal expansion • 2-3: Constant-volume cooling • 3-4: Isothermal compression • 4-1: Constant-volume heating http://en.wikipedia.org/wiki/Stirling_engine#The_Stirling_cycle

  3. The Stirling Cycle • Closed Cycle – the working fluid never leaves the system • Reversible • External heat source – any heat source is valid, as long as it produces enough heat to expand the fluid • Uses a “regenerator” to conserve internal energy and increase thermal efficiency. http://en.wikipedia.org/wiki/Stirling_engine#The_Stirling_cycle

  4. The Stirling Engine • First developed in 1816 by Reverend Dr. Robert Stirling • After development, had little use until the mid 1900’s, when it became more common • Used today in many applications, primarily green energy, since the heat source can be anything (geothermal, solar, etc.) http://en.wikipedia.org/wiki/Stirling_engine#The_Stirling_cycle

  5. The Stirling Engine • Main application of the Stirling cycle • Uses pistons and cylinders to rotate a crankshaft • Two types/configurations – Alpha and Beta • Alpha Stirling engines use two cylinders and two pistons • Beta Stirling engines use one cylinder, one piston and a “displacer” http://en.wikipedia.org/wiki/Stirling_engine#The_Stirling_cycle

  6. Pros • Mechanically very simple in comparison to internal combustion engines • Lightweight, compact • Not limited by fuel or heat source • Aside from a longer warm-up time, reliable in cold weather (unlike some engines) http://en.wikipedia.org/wiki/Stirling_engine#The_Stirling_cycle

  7. Cons • Low torque • In order to be more efficient, it requires metals with very high thermal conductivity, which can be expensive • Rotation is not always smooth – the fluid sometimes heats up faster than it cools off http://en.wikipedia.org/wiki/Stirling_engine#The_Stirling_cycle

  8. Alpha Stirling Engine http://en.wikipedia.org/wiki/Stirling_engine#The_Stirling_cycle

  9. Beta Stirling Engine http://en.wikipedia.org/wiki/Stirling_engine#The_Stirling_cycle

  10. Cool Stuff • This one runs off of body heat • Probably no real application, just cool http://en.wikipedia.org/wiki/Stirling_engine

  11. Cool Stuff • Solar Stirling engine • Uses reflected sun rays as heat source • Green energy • Could power a house http://www.researchdata.us/Images/Stirlingdish2.jpg

  12. Cool Stuff • Very large solar Stirling engine • Could probably power a small city http://www.tommccarty.com/blog/wp-content/uploads/2008/08/brightsource-solar-mojave2.jpg

  13. Cool Stuff • Theoretical solar Stirling engine • Uses residual heat produced from a solar panel sitting in the sun as heat source • Converts the unused heat into electrical energy that can be used http://www.peacekeeper.com/freeideas/ow.asp?p=PersonalStirlingEngine&a=print

  14. Works Cited • http://en.wikipedia.org/wiki/Stirling_engine#The_Stirling_cycle • http://www.tommccarty.com/blog/wp-content/uploads/2008/08/brightsource-solar-mojave2.jpg • http://www.peacekeeper.com/freeideas/ow.asp?p=PersonalStirlingEngine&a=print • http://www.researchdata.us/Images/Stirlingdish2.jpg

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