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STIRLING ENGINE. HISTORY. Inventor = Robert Stirling (1790 - 1878) Sought to replace the steam turbines of his days due to frequent explosion caused by unsustainable high pressure killing and injuring workers

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Presentation Transcript
history
HISTORY
  • Inventor = Robert Stirling (1790 - 1878)
  • Sought to replace the steam turbines of his days due to frequent explosion caused by unsustainable high pressure killing and injuring workers
  • Invented Stirling engine in 1816 which could not explode and produce more power then th steam engine used.
what is stirling engine
WHAT IS STIRLING ENGINE ?
  • Device that converts heat energy to mechanical power by alternately compressing and expanding a fixed quantity of working fluid at different temperatures.
  • Regeneration as alternative.
why stirling engine
WHY STIRLING ENGINE?
  • Best teaching and learning for any engineering students device especially in the field of thermodynamics.
  • Unique technology.
  • An innovation with hundreds of application.
  • An innovation with a mission to save the earth.
  • Fuel independency.
main components
MAIN COMPONENTS
  • Power piston – small tightly sealed piston that moves up when the gas inside the engine expands
  • Displacer – larger piston and it is very loose in its cylinder so air can move easily between the heated cooled sections of the engine as the displacer moves up and down
  • These piston move by the action of compression and expansion.
  • Difference in pressure causes the piston to move and produce power.
working principle
WORKING PRINCIPLE
  • One side of the engine is continuously heated while the other side is continuously cooled.
  • First, the air moves to the hot side, where it is heated and it expands pushing up on a piston.
  • Then the air moves through the regenerator to the cold side, where it cools off and contracts pulling down on the piston.
  • Temperature change inside the engine produces the pressure change needed to push on the piston and make the engine run.
efficiency
EFFICIENCY
  • Theoretically
  • Stirling engine efficiency = Carnot efficiency
  • Unfortunately working fluid or gas is not ideal this causes the efficiency to be lower than Carnot efficiency.
  • In fact, Stirling engine efficiency depends on
  • Temperature ratio (proportionally)
  • Pressure ratio (inversely proportional)
  • Specific heat ratio (inversely proportional)
advantages
ADVANTAGES
  • Various heat sources (solar, geothermal, nuclear energy, waste heat, biological)
  • Environmental friendly
  • Heat is external and the burning of a fuel-air mixture can be more accurately controlled.
  • Operates at relatively low pressure and thus are much safer than typical steam turbines
  • Less manpower needed to operate any type of commercial Stirling engine.
applications
APPLICATIONS
  • Water pump stations
  • Combined heat and power plant
  • Solar power generation
  • Stirling cyrocoolers
  • Heat pump
  • Marine engines
  • Nuclear power
  • Aircraft engines
  • Micro CHP
application
APPLICATION
  • WATER PUMP STATION
  • A Stirling engine used for pumping water can be configured so that the water cools the compression space. This is most effective when pumping cold water.
application13
APPLICATION
  • STIRLING CYROCOOLERS
  • Any Stirling engine will also work in reverse as a heat pump. When a motion is applied to the shaft, a temperature difference appears between the reservoirs.
  • NUCLEAR POWER
  • Replacing the steam turbines of the nuclear power plant with Stirling engine might simplify the plant, yield greater efficiency, and reduce the radioactivity by products.
conclusion
CONCLUSION
  • Unlimited source of heat source
  • Political awareness of green heat and power production.
  • Large market experiencing rapid growth.
  • Many different possible applications.
  • Time to change.
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