Effect of Dodecagon Shape Frustum Concentrator and Internal Fins in 2 in 1 Box-Type Solar Cooker

This paper aims to combine the applications of cooking and hot air generation in single box-type solar cookers to reduce environmental pollution and to save energy, cost and space. Because of the combined effect, a 33.42% improvement in efficiency is obtained. An innovative dodecagon shape of frustum concentrator is introduced which increases efficiency by 6.3% compared to conventional mode. Different types of pan (i.e. receiver) materials like Mild steel and Aluminium are analyzed. The usage of Aluminium leads to a 4.27% increase in total efficiency compared to Mild steel pans. The effect of internal fins in Aluminium pans is studied which leads to 3.59% increment in the efficiency of cookers compared to the aluminium pan without fins. The combined 2 in 1 effect leads to a reduction of 272 kg of CO2 emission per year and the simple payback period of the cooker is 10 months.