The black surfaces on the inside of the oven captures the sun's energy focused by the reflector panels and transforms the suns rays into a wave length that cannot escape from the oven chamber.

When a The Global Sun Oven is focused directly into the sun, the interior of the oven is heated by the sun's energy. Direct and reflected sunlight enters the oven chamber through the glass door.

It then turns to heat energy when it is absorbed by the black inner-shell and levelator. This heat input causes the temperature inside the oven to rise until the heat loss of the oven is equal to the solar heat gain. The light energy absorbed by dark pots and the oven's dark interior is converted into longer wavelength heat energy. Most of this longer wavelength radiant energy can not pass back out through the glass, ensuring more efficient cooking.

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