stirling_engine.pdf

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PROJECTS: STIRLING ENGINE

www.makezine.com/07/stirlingengine

THE STIRLING CYCLE

Every heat engine

works on a cycle. When

heat is applied to a

working fluid, the fluid

undergoes some sort of

change — its pressure,

volume, or temperature

is increased by the

added heat — and in so

doing, the fluid does

meaningful work on

its surroundings. Work

could mean making

a piston move, or a

turbine, or some other

mechanical object. The

Stirling cycle is a four-

step process, using hot

air as its working fluid.

Four Steps of the Stirling Cycle

1

2

3

4

COOLING

Cold piston (left) moves

upward by flywheel iner-

tia, drawing hot air over

to cold side.

EXPANSION

Hot air is forced to the

left cylinder, forcing the

cold piston up. This is

the power cycle.

COMPRESSION

As air in the cold

water contracts,

the cold piston

moves down.

HEATING

With the cold piston

fully down, most air

is on hot side and

getting reheated.

92 Make: Volume 07

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