Shobha Pardeshi writes:
First of our project is " Low Cost Solar Cooker ". For this we selected Funnel Cooker by Dr. Steven Jones While our experiments were being carried out we had found out that stacking of pots works better than placing them them side by side in funnel cooker. See these results here. Hence we considered the total size of stacked cooking pots as 6 inches dia. And 6 inches height.
We decided to improve this design. From the drawing we decided on a meeting point of Sunlight that are reflected from the rim of the cone. ( Point 'x' in figure1). The second cone of 900 was started from this level( The reference for this was taken from Prof. Mann's (1981) improvement to VITA design ). The length of 900 cone section was taken as 6.25 inches. The base was closed and made reflective, so that any sunlight passing from sides of cooking pot is reflected back. The diagram of this with sunlight reflection is shown in Fig 2. From the diagram concentration of sunlight on cooking pot is clearly seen. This cooker is useful for unattended cooking. Reflections of sunlight with respect to position of Sun for -60 minutes to +60 minutes is shown in fig 3. We had used pressure cooker cooking pots in stacked position with plastic cover. Opening diameter of this cooker is 24 inches. Basically this is a duel angle funnel cooker. We have Named it as 'Parvati Solar cooker'.