Date post: | 18-Dec-2015 |
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What you need…
An old tyre, a glass square big enough to cover it,
a black pot, silver foil, newspaper, tape, cardboard,
something to weigh the glass down… and some sun!
Cardboard
Place the cardboard on the ground, making sure that
it is flat.
This acts as extra insulation for the oven.
Tyre
Put the tyre onto the cardboard. Check that there
are no gaps between them.
The tyre absorbs heat from the sun.
Newspaper
Add newspaper all around the inside and the base of
the tyre.
The newspaper traps air and adds more insulation.
Silver foil lining
Add a long length of silver foil all around the sides
and inside of the tyre.
This acts as your main solar reflector (like a mirror).
Glass square
Tape the edges of the square of glass* to avoid
accidents. A circular piece of glass will be even
safer.
* the glass we used was 64 x 64 cm
Black pot
Place a black pot into the middle of the tyre; using a
black lid is even better.
Try a stew* without much water content at first.
* we cooked a pumpkin and rice stew
Add the glass
Put the glass on top of the tyre, ensuring there are
no gaps. Add some weights to avoid heat leaking
out of the oven.
Leave in the sun
Make sure that your oven is in full sun with no
shadows. Leave it for about 4-5 hours, depending
on the strength of the sun and what you are cooking.
How it works
Solar radiation enters through the glass and UV light is trapped inside the oven.
Light reflects off the silver foil and warms the heatabsorbent black pot.
Heat is kept in the oven by the newspaper andcardboard insulation.
The black tyre absorbs heat, helping to heatthe whole oven, and it adds extra insulation.
Taste!
Check your food to see if it is cooked. Try not to
let too much heat escape – be careful, it may be
very hot. Then taste it!
Please send pictures of your Solar Tyre Oven to: [email protected]
Find more resources at:
sendacow.org.uk/lessonsfromafrica
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