free piston stirling manual.pdf

Free Piston Stirling Engine Kit

IMPORTANT NOTICE !

These low temperature differential Stirling engines require

only a small difference in the bottom and top plates to

operate. DO NOT place them on a high temperature heat

source (e.g. oil/wood burning stove, candle, Arga stove). If

you do, it will melt a number of parts on the Stirling engine. It

can be placed on top of a recently boiled cup of

water/tea/coffee but nothing hotter.

Starting your engine

Once you have built your engine, place the engine on top of

a recently boiled cup of water (as shown on picture on the

left). Leave the engine for a minute in order for the cylinder

base to warm up. Then simply tap the counter weight.

Parts included with the kit

Assembling Your Stirling Engine

1. Take the power cylinder and push the

power piston/shaft through the centre. The

thread on the shaft should be protruding from

the thinnest part of the power cylinder . Make

sure the piston moves through easily. Check for

any debris in the power cylinder. Then remove

the power cylinder until later.

2. Take the displacer cylinder and add the

two ‘o’ rings as shown on the diagram. They

will be a tight fit.

3. Take the displacer cylinder and place

cylinder base at one of the ends.

4. Place them both on a solid surface and press

down hard so the cylinder base fits over the ‘o’

rings to create a good seal.

5. Take one of the lower springs and place in

the bottom of the displacer cylinder .

6. Take the power cylinder and push onto the

top of displacer cylinder .

7. Add the cylinder nut onto the thread. Make

sure there is a 3mm gap of thread below the

nut.

8. Take the power cylinder and push the

power piston/shaft through the centre. The

thread on the shaft should be protruding from

the thinnest part of the power cylinder (shown

on the left of the diagram).

9. Take the cylinder cap and screw it on to

the power cylinder. Make sure it is on tight and

the nut does not move (there should still be a

3mm gap of thread below the nut).

10. Take the upper spring ; fold it over the top

of the power piston/shaft as shown in the

diagram.

11. Screw the piston nut onto the power

piston/shaft . Make sure there is a 1mm gap of

thread below the nut.

12. Screw the counter weight onto the power

piston/shaft . Make sure there is a 1mm gap of

thread below the nut. Make sure it is on tight

and the nut does not move (there should still be

a 1mm gap of thread below the nut).

13. The end of the power piston/shaft should

just touch or be just above the lower spring . If

it is not, adjust the nuts according.

14. Take off the power cylinder and insert the

displacer piston . It SHOULD NOT be glued or

fixed in anyway. This is a free piston.

15. Put the power cylinder back on the

displacer cylinder . Prepare a cup of freshly

boiled water. Place the cup/mug cover on the

cup/mug. Then place the finished Stirling

engine onto of the cover. Wait a minute and

gently tap the counter weight .

How the Stirling Engine Works

Cooling Phase (Far left) – The displacer piston (large piston) is begins to drop.

The air in the Stirling engine is beginning to cool ready for the contraction phase.

Contraction Phase (Second from left) – The Cooling phase has just finished.

The overall temperature of the air inside the Stirling engine has dropped and

hence the internal air pressure is dropping. The power piston (small piston) is

being pulled down by this pressure drop. The displacer piston (large piston) is

now at the bottom and the cooling has reached its peek.

Heating Phase (Second from right) – The displacer piston (large piston) is has

been pushed up by the spring. The air under the displacer piston begins to heat

up.

Expansion Phase (Far right) – The overall temperature of the air inside the

Stirling engine has increased and so has the air pressure. The air is expanding

and the power piston is being pushed up. The displacer piston (large piston) is

now at the top, heating is at its peek. The cycle will repeat until the difference in

temperature between the top and bottom plates are too small.

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