USE A CARDBOARD BOX!!
(thick type used for covering school books)
insulation with styrofoam with covered aluminium
With the knife, cut the cardboard box as shown in the diagram below. Remember to make the back about twice the height of the front, so that the lid will be at an angle to the sun. Don't cut the front too short either, as the rays need to reflect off the inside front of the box as well.
Now cover the inside (sides and
base) of the box with a few layers of newspaper. This will act as an insulator.
Then cover this again with a layer of tinfoil.* If you wish, you
can cut styrofoam to fit the inside box. (You can buy covered styrofoam
with foil or just cover it yourself.) Make sure that the foil overlaps
all the edges of the box, and tape the excess to the outside of the box.
Paint the "outside" of the box with
the black paint
Cut a double layer of the plastic,
big enough to OVERLAP all the edges of the box. Tape these 2 layers together,
and then fasten one edge to the back of the box with the tape. To ensure
that this 'lid' does not blow off, either thread a dowel stick (about 1cm
in diameter) or a row of curtain lead weights, through the end of the plastic
that will hang in front of the box.
Your solar cooker is now ready to be used!
Easy wasn't it?
Hitney Solar Products
P.O. Box 365
The Solar Lady: