Here is my recently created solar oven which I built based on ideas from the Solar Cooking Website. It is made out of two cardboard boxes, some IBM printer paper used as insulation around the sides, and aluminum foil.
The food is in a black colored pot that is wrapped in an oven bag.
The first one I made was only able to achieve a temperature of 160 degrees Fahrenheit on a clear day. I live in Texas and it was 90 degrees Fahrenheit outside when I tried this oven.
Version 2.0 includes the following modifications:
It was suggested that I use a glass window but I do not want to spend the $10 for a piece of Lexan at Home Depot to do this and I have not found a glass shop. My goal is to make this oven out of scrap material spending as little money as possible. Spending money on a solar oven defeats its purpose.
Here is a pic after the modifications:
The modifications above resulted in a temperature of 190 degrees Fahrenheit which is an increase of 30 degrees over the first design. This is better but still not good enough. My target is 250 degrees Fahrenheit which is recommended to bake bread.
Version 3.0 includes a larger reflector and an inner box that is tilted towards the sun. I also placed a brick inside the inner box and packed in some newspaper around the inner box for insulation. It has achieved a temperature of 200 degrees:
The angle is 42 degrees (42 is always the answer to everything).
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