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Posted by: HyperDog on 2008-09-11, 17:44:12
Use the plastic wrap and balsa wood to make the "housing " for a solar oven. This will trap warm air and prevent air movement which would pull heat away from the water in the aluminum can. The aluminum foil can be shaped into a parabola (one axis, at least), placed inside the oven where it will be used to focus the Sun onto the back and sides of the aluminum can, which I assume you know should be painted black. Also, any other surface exposed to the Sun inside the oven should also be painted black (floor, back wall, etc). If you use multiple layers of plastic wrap with a little space separating them, it will lessen the heat loss (just like double-paned windows). |