Washer to Global Sun Oven story revised
(Charlotte, North Carolina)
Washer to Global Sun Oven
For my Global Sun Oven I constructed the bottom box from metal from a washer that was going to be recycled for metal parts. Thus, this global sun oven is an exterior metal box and within it is a smaller metal box. I utilized measuring tape to measure all my box measurements and an angle grinder with a 4 and ½ inch metal grinding wheel to cut the metal from the washer. The exterior box measurement for the front side is 12 inches in height by 27 inches long. The exterior box measurement for both sides is 16 inches tapered to 12 inches in height by 21 inches long. The exterior box measurement for the rear side is 16 inches in height by 27 inches long. The exterior box measurement for the top is 21 inches length by 27 inches wide. The exterior box measurement for the top inner portion that opens on one side is 16 ½ inches in length by 18 inches wide. Within the top inner portion that opens on one side I cut the metal (17 ½ inches length by 13 ½ inches width) such that a piece of glass (18 inches length by 14 inches wide) could be placed on it to allow the sun to come into the global sun oven. The exterior box measurement for the bottom is 21 inches in length and 27 inches wide. The inner box measurement is 18 inches in length on the sides and 23 inches length on the front and rear panels. Along the sides they are tapered going from 15 14/16 inches to 11 14/16 inches for the height. The insulation used between the inside and exterior metal box was a Durablanket S (perfect insulation up to temperatures of 2100 degrees Fahrenheit) purchased from Jim Wiles with Southern Services Company. When I installed the Durablanket material I had to use a mask since the dust from the Durablanket S was not acceptable to inhale at any levels. I used metal screws to adhere all of the sides together in the inner and exterior metal boxes. Then, I sealed the inner and exterior box with JB Weld cold since this product can withstand temperatures up to 600 degrees Fahrenheit. I painted all the metal surfaces black with High temperature Barbeque spray paint. The upper reflectors are constructed from fiberboard and then covered with 2 mil Mylar reflective film on the inside that reflects the sun rays inside the global sun oven. The upper reflectors are all 21 inches tall and the two sides measured 13 inches on the bottom by 21 inches on the top. The upper reflectors along the front and rear measured at 17 ½ inches on the bottom by 24 inches on the top. I attached the Mylar with tape to the fiberboard and the sides were attached together using hinges on the upper and lower side of the fiberboard for a total of eight hinges used. On the front side of the metal box is a handle in the center to lift up the global sun oven and at the back of the global sun oven in the middle is a mobilizing device (16 inch cabinet drawer slider used for cabinets drawers to slide in and out which can handle 35 pounds of lifting capacity) which is able to lift the global sun oven to an angle necessary to deliver the best sun based on the time of day. To attach the upper reflectors to the box I had to install on the front and rear side a metal piece that has a hole in it at the bottom section. I then took one metal spring and attached it to the handle and the hole in the metal piece on the reflector. I took the other metal spring and attached it to the middle mobilizing device and then to the metal piece on the reflector so it does not move. I placed the global sun oven in the sun and the global sun oven temperature went to 275 degrees Fahrenheit.
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