Solar cooker

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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 energy 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
• cant easily move upward to escape away from
  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 cant 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

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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