Interactive Primary Newsletter 36 Sun and Wind (Renewable Energy Special)
Heating water & cooking with solar power In the Fig. 14 you can see a small black film can in place in the solar cookers. These were filled with water and the temperature measured regularly. This was done inside with the cookers set up on a window sill, and although the sky was somewhat hazy and the sun was passing through double glazed windows, we still achieved a noticeable rise in temperature (Fig.15). Figure 14 -  Solar cooker and film canister filled with water     Figure 15 - Library box cooker even heats water to over 40 deg.C To illustrate the cooking potential of the cooker we passed a nail through an apple and attached it to the cooker - 90 min. cooking time at Sun Mark 5! (Fig.17). As this was done inside, in Scotland, in May, it is obvious that the temperatures achievable in the cooker in sub tropical areas would be greater and cooking times would be subsequently be reduced. AVOID STARING AT SOLAR COOKERS - IT IS HARMFUL TO THE EYES
Figure 16 - Solar cooker with fresh apple.	Figure 17 - Solar cooker cooks apple in 90 minutes