Back in May I gave a presentation at Basis for a Solar Astronomy Day event.
One of the projects was to build a solar oven to make smores. I tried 3 different designs -- all were painted black with flat black enamel from Home Depot. The most successful design is pictured above.
I recycled a box of caulking (yay for never ending house projects) by cutting a large hole, then covering the hole with saran wrap which was taped to form a rough seal. After I placed the goodies in the box, I also taped it shut. After 30 minutes in the mid-day sun, I had some nice smores. The other two boxes did not have windows and they were generally 10 degrees cooler than the cellophane window box. I was a little surprised as I assumed that the closed black box would be the hottest. I guess good ole direct infrared energy is the most efficient way of delivering heat.
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