In the experimental procedure, a solar cooker box-type was used. The solar cooker is integrated by
the following elements: 1. a cover with two flat glasses with a clearance between them. 2.
Reflectors placed on the cover outer of the cooker 3. Internal reflectors made in commercial
aluminium paper placed to different tilt angles, 4. Thermal insulator placed in the lateral part of the
same one, and 5. Recipient contains the product to cook. The solar cooker is locked tightly; this
allows reaching considerable temperatures in the water. In figure 1 the solar cooker is shown.