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Solar cooker
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1)How can we make use of reflection to gather more solar
energy ? We use black boxes to absorb heat ene
rgy and aluminium paper to reflect solar energy onto a tin of water.
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2)What kind of materials should be used to construct the body of
the solar cooker?Why?• Black box – Absorb more solar energy
• Aluminium paper – Reflect solar energy
• Glue – to stick the aluminium paper
• Tin – container of water
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3)what other measure can help to reduce heat loss by conduction
and convection? A polystyrene box reduce heat loss by conduction . It is an insulating box . A lid reduce heat loss by convection . Warm air can’t easily move upward to escape away fr
om the box.
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4)How can we make use of greenhouse effect to trap more
solar energy?To trap heat energy making use of greenhouse
effect . The radiation enters the box and warms up the air inside. This radiation can’t easily escape through the glass and is trapped inside the box . This keeps the boxe warm , so that the temperature of water will increase gradually under the sun .
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5)How should the container of water look like?
A aluminium can paint in black colour . It is because black colour surface is a good absorber of heat . Then , we can wrap the can with some cotton. It is because cotton can trap heat . Water is filled to ¾ of the can. So the water can heat up more quickly .
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6) When and how the solar cooker should be used to enhance
its performance? After 10 minutes , the sun made the air of
solar cooker warm up . So the temperature of the water started increasing . At the end , the temperature of solar cooker increase 18 degrees .
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Data recording
Time/min 0 5 10 15 20 25 30
Temperature/oC 20 21 23 24 26 26.5 28
Time/min 35 40 45 50 55 60 65
Temperature/oC 29 30 32 33 35 36 38
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COMMENT
We think this project is difficult . It is because we need so many material to make the solar cooker . Unfortunately , we have to make the solar cooker once again , because our solar cooker had been thrown away by somebody . Then , we have to do a lot of experiment , and we should discuss the result .
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• Group members :• 4D (1, 8, 9, 16, 19)
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The end