LET'S BUILD A REAL EXTERNAL COMBUSTION ENGINE FROM TIN COA CANS AND GENERATE ELECTRICITY
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What is Stirling Engine?
A Stirling engine is a machine that converts the energy generated by the external heating of a closed chamber into mechanical energy. Also known as a hot air engine. As the heated air expands and compresses, the engine starts to move. It was invented in 1816 by the Scottish priest Reverent Robert Stirling. The engine was developed by his brother, James Stirling. In the time of the inventors, steam-powered machines were used and they were quite dangerous. They set out to find a more reliable alternative. What they wanted was to convert heat energy directly into motion energy.
Working Principle of Stirling Engine
A Stirling engine operates by repeated heating and cooling of an insulated amount of working gas (usually air or gases such as helium, hydrogen).
Gas exhibits behavior defined by gas laws (relative to pressure, temperature, and volume). When the gas is heated, because it is in an insulated space, its pressure rises and affects the power piston, producing a power stroke. When the gas is cooled, the pressure drops and as a result the piston uses some of the work done on its return stroke to recompress the gas.
Some Stirling engines use a splitter piston to move the working gas back and forth between cold and hot tanks.
Advantages of Stirling Engines
► Since heat is applied from outside, we can accurately control the fuel and air mixture.
► Since a continuous heat source is used to provide heat, the amount of unburned fuel is very low.
► This type of motors require less maintenance and lubrication than the motor types of their own power level.
► They have a very simple structure compared to internal combustion engines.
► They can work even at low pressure, they are safer than steam-sourced machines.
► Low pressure allows the use of lighter and more durable cylinders.
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