Stirling Engine - PowerPoint by hcj


									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
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.
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
Fuel independency.
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.
I.   One side of the engine is continuously heated
     while the other side is continuously cooled.
II. First, the air moves to the hot side, where it is
     heated and it expands pushing up on a piston.
III. Then the air moves through the regenerator to
     the cold side, where it cools off and contracts
     pulling down on the piston.
IV. Temperature change inside the engine produces
     the pressure change needed to push on the
     piston and make the engine run.
   Stirling engine efficiency = Carnot efficiency
   Unfortunately working fluid or gas is not ideal this
    causes the efficiency to be lower than Carnot

 In fact, Stirling engine efficiency depends on
   Temperature ratio (proportionally)
   Pressure ratio (inversely proportional)
   Specific heat ratio (inversely proportional)
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.
Water pump stations
Combined heat and power plant
Solar power generation
Stirling cyrocoolers
Heat pump
Marine engines
Nuclear power
Aircraft engines
Micro CHP
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.
  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.
  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.
Unlimited source of heat source
Political awareness of green heat and power
Large market experiencing rapid growth.
Many different possible applications.
Time to change.

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