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Encgy Sourcrr. b l u m 15. pp. 415-431 R i n d in the UK. All rights rc~srvcd.Abstract A simple, eficient solar cooker was designed and its performance in the Egyptian climate was evaluated. The cooker is of the hot box type with a plane booster mirror reflector. The performance of the cooker was measured experimentally for over 2 years under different working conditions. The test conditions include experiments with and without adjusting the cooker's position for maximum sohr radiation and the tilting angle of the booster reflector for maximum concentration. Formuhs for calculating the orientation angle of the oven and the tilt angle of the reflector were deduced. The shadow effect caused by the sides of the oven were also calculated. The solar cooker proved to be reliable, trouble-free, and eficient. All kindr of food were cooked, including meat, chicken, rice, peas, beans, potatoes, soup, eggs, and cakes. A good meal for a family of four was cooked in 3-4 h. It was established that better heat transfer occurred when the cooking pot was covered with an air-tight plastic transparent cover rather than using an ordinary metallic cover. The energy balance of the cooker from heat-transfer considerations enabled esrimates of both oven and food temperatures to be made. Calculated values agreed well with the experimental measurements.