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Physics Project ~. Solar Cooker. Objective:. ++Save money ﹏ the material we used were recycled one. ++Convenient ﹏ we do not need to look after it when heating the water. ++ Protect the environment ﹏
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Physics Project ~ Solar Cooker
Objective: ++Save money ﹏ the material we used were recycled one. ++Convenient ﹏ we do not need to look after it when heating the water. ++ Protect the environment ﹏ the solar cooker use solar energy which is renewable energy. It reduces the need to use coal, petroleum gas .. etc which are non-renewable energy. In so doing can reduce the amount of pollutants. ++Creative ﹏ the solar cooker is made from the ideas of the whole group.
Materials used: 。A paper box 。A paper which is black in colour 。Aluminium foil 。Cling wrap 。Cotton 。An aluminium can
Construction Skills →We used a box and painted it black. →Inside the box, we glued aluminium foil onto it. →We made two cards for reflecting light on two sides of the box. →We put the can in the middle of the box and use a convex lens to focus light onto it. →And then we cover the box with cling wrap.
Application of physics principles in the design ∠Black surface can absorb energy more efficiently. ∠Silvery surface inside the box can reflect energy onto the can. ∠Cotton was wrapped around the can to reduce the energy loss. ∠The cling wrap can have greenhouse effect to decrease the energy loss. ∠Convex lens is used to focus the energy onto the can.
Test of the solar cooker The first test: Original temperature~20oC 1st~21oC 2nd~22oC 3rd~22.5oC 4th~23oCoC 5th~23.5oC 6th~24oC 7th~25oC 8th~26oC 9th~26.5oC The second test: Original temperature~22oC 1st~23oC 2nd~25oC 3rd~27oC 4th~30oC 5th~30.5oC 6th~31oC 7th~32oC
Conclusion ∞We have leant how to apply the knowledge we had leant before and apply these to our daily lives. ∞We learned the principle of keeping thing warm. ∞We learned how to use our renewable energy-solar energy. ∞If the society makes use of solar energy, it can help reduce a lot of pollutants.
Improving ↑We should use more reflecting surfaces to reflect energy onto the can ↑We should put the can higher in the box. ↑We should use a bigger paper box. ↑The aluminium foil should be straight so as to cause regular reflection.
Group Members: ╭☆Ching Man Ka (7) ╭☆ Ho Pui Ki (10) ╭☆ Lee Cheuk Man (13) ╭☆ Yau Yuen Ching (17) ╭☆ Yeung Ka Hei (18)
Cost Paper in Black $1 Paper box free Aluminium foil $12.3 Cling wrap $15.4 Cotton free Convex lens free Can free $28.7