Mini solar cooker with heat storage

1- A solar cooker consisting of an insulated wall (11), a transparent surface (1), characterized a Fresnel lens (2) with a focal length of 250 mm, movable by means of one or two supports (3), the latter linked to an electronic mechanical system (12) to automatically track the height of the sun. During pre-heating, the focal point (10) of the lens (2) located on the small copper tank (4) containing a phase-change material (6), the latter is thermally charged by two methods:

• the concentration of radiation by the lens (2) and/or by an auxiliary resistor supplied by an alternating current (5), the heat accumulated in the small tank (4) enables the oven to be used when the sun is absent or to reduce the cooking time. During cooking, the container (8) or (16) receives heat by conduction via the small reservoir (4) already heated and/or by radiation via the focal point (9) located on its lid. The assembly is linked to an electronic mechanical system (7) to automatically follow the path of the sun.