Dr. Siaka Toure, Professor, Felix Houphouet-Boigny University, Abidjan Cocody , Côte d'Ivoire.

Speech Title: Design, realisation and experimentation of a solar cooker fitted with an ellipsoidal concentrator: preliminary results of cooking tests

Abstract: This article is about the realization and experimentation of an elliptical solar cooker. This prototype has a single focus and a reflective surface made of galvanized sheet. Its opening diameter is 120 cm and focal length is 60 cm. In a first step, Cooking Tests of six eggs in 0.5 L of water were carried out by fixing the maximum cooking time to 2 hours. The first results showed that the cooking of the eggs was partial. Despite adequate illumination, the temperature 82 o C, at which starts the cooking of certain foods according to «International Solar Cooker", could not be reached. Thus, a glass cubic box was built that served as an envelope for the pan. In 60 minutes with this new configuration, a temperature of 88.23 o C was reached, which is widely more than the 82 °C required. After 80 minutes of cooking, a temperature of 92.12 ° C was reached. Finally, after 80 minutes of cooking, all six eggs were completely cooked. . In the second step, the reflective surface was coated with mirror. In such configuration, seven eggs were perfectly cooked after 40 minutes of cooking in 0.5 litres of water. 250 grams of rice were also cooked after 80 minutes of cooking, in 0.50 litres of water. Experiments were made simultaneously with a parabolic concentrator solar cooker. Efficiency calculations showed that the ellipsoidal concentrator solar cooker and the parabolic concentrator solar cooker have almost the same efficiency, with a slight advantage for the ellipsoidal concentrator solar cooker.