The Stirling Engine Angela Hon Jared Williams Pete Mazzarella Richard Gray ~History~ The Stirling Engine, originally known as the Economiser, was patented by Rev. Robert Stirling in Edinburgh, Scotland in 1816. The “Economiser” was originally developed as a safer alternative to steam engines; however, when steam engines were redesigned to be safer, Stirling engines became nearly obsolete. This simple engine can run on a variety of fuel sources, including flames, decaying vegetation, and even the heat of your hand. The Stirling Engine has a work output far closer to the theoretical ideal efficiency than most engines. Despite high efficiency and availability of fuel sources, the Stirling engine has always taken a back seat to more popular designs such as steam engines and internal combustion engines. The Stirling Cycle COOLING: EXPANSION: CONTRACTION: HEATING: The The left Heat right piston The is moves added piston piston up to moves in while the the gas up cooled the inside while right piston cylinder the the hot left moves (right) cylinder piston down. starts moves (left), This to down. pushes compress causing This thethe pressure forces hotgas. gas the Heat into togas the into cooled build. generated the heated Air cylinder, expands, bycylinder, this which quickly compression where forcing cools it the quickly is piston the removed gas heats toto up, the move by building the temperature down. cooling pressure, This source. of is the the at cooling part which of the source, point Stirling the lowering cycle cycle its that pressure. does repeats. the Thiswork. makes it easier to compress the gas in the next part of the cycle. Diagram taken from: http://electron9.phys. utk.edu/phys136d/modules/m3/m3ex1.htm TSE-03 from http://www.bekkoame.ne.jp Our revised model Stirling Engine OUR DESIGN CHANGES Changed design from metric to english, including bolts and holes Adjusted sizes of cylinders, pistons, heater, and holes in cylinder cover Redesigned pistons to make them solid and add o-ring groove. Changed materials for pistons and cylinders Added o-rings for sealing pistons into cylinders Resources http://www.stirlingengine.com/ Link to the American Stirling Company, manufacturers of commercial and model Stirling Engines http://www.bekkoame.ne.jp/%7Ekhirata/english/mk_t03.htm Where we got our basic design http://travel.howstuffworks.com/stirling-engine.htm Howstuffworks- an excellent resource for understanding the Stirling Cycle http://web.vtc.edu/MEC/1012/Spr04_Group_Projects/Pirates/Web%20 Pages/Group%20Webpage.html Our Web Site