It’s summer and that means dusting off those solar ovens. No need to heat up the house hotter than it is for cooking simple foods. We built our first sun oven back in the mid 90’s and have been harnessing the sun’s free energy ever since.
Solar cooking is fun, easy and better yet you can make solar ovens simply and cheaply – with free “cast offs.”
Like our friend here (shown in picture) did for a class project (he got an “A” btw!)
“This was an old plastic file cabinet on a stand. It can look straight up or usually best at a 45 degree angle as the Sun’s path changes throughout the day. I used Hardibacker concrete board for the thermal mass layer cut to fit on the inside of the plastic box, Sealed as a complete concrete board box prior to pressing it in with gaff/fabric tape.
This is all sprayed black with toxic free black paint. (Flat black is best. It has a low Albedo. High absorption, low reflectivity.) I replaced the original plastic lid (which melted on the first test) with a double paned glass & wood lid, using an old picture frame glass and hardware and an old wood TV table tray top… The new wood lid frame was cut and routed to fit tightly in the oven opening, the glass installed matching the original picture frame template glass size using the original picture frame hardware to mount the glass. Old hinges served for the new lid, but is not necessary.
You want a tight fit to keep the air trapped. This is important and pointing the oven directly at the sun is best. The reflector dish is cardboard covered with aluminum foil. If you look at thes DIY videos you’ll find the info. There are some good ones there. ”
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