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Using Renewable Energy from the Sun

Where did the idea come from?. Archimedes, an ancient Greek mathematician, invented a device that was used to focus sunlight onto approaching enemy ships, causing them to catch fire. . Archimedes Heat Ray. Conduction, Convection,

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Using Renewable Energy from the Sun

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    1. Using Renewable Energy from the Sun

    2. Where did the idea come from? Archimedes, an ancient Greek mathematician, invented a device that was used to focus sunlight onto approaching enemy ships, causing them to catch fire.

    3. Archimedes Heat Ray

    4. Conduction, Convection, & Radiation Review Conduction - Heat traveling through solids. Two objects must touch or have direct contact. Convection - Heat traveling through liquids or gases. Radiation - Release of invisible heat energy waves from the sun or fire.

    5. Making our solar ovens We will construct a solar oven in order to cook smores while using our knowledge of conduction, convection, radiation, solar energy, insulators, conductors, and the scientific method.

    6. Directions Each person should take out a piece of notebook paper. Title your paper SOLAR OVEN LAB. You will hand in your completed paper at the end of the second day of this lab. You will have 10 items to complete.

    7. Choose your variable Based on our investigations this week regarding insulators and conductors, choose a variable that your group would like to change in the design of the second solar oven to compare with the control oven. Your team must decide what will cook your smores the best. Each team must select only 1 variable.

    8. Variables: Select ONE Controls Black construction paper for bottom of oven Shiny side of aluminum foil for top of oven Rolled newspaper for insulation Clear plastic wrap for cover of oven

    9. Planning your Experiment #2. Select only ONE item to test: Color of paper white or black Aluminum foil shiny or dull Newspaper rolled or shredded Cover clear plastic or wax paper #3. Explain the difference between the variable and control. Variable: Aluminum Foil The variable oven will use the dull side of the aluminum foil. The control oven will use the shiny side #4. Then, create a list of the variables you will not change the controls. 10 pizza box Black construction paper Rolled newspaper Shiny aluminum foil Clear plastic wrap Clear tape

    10. Materials 10 pizza boxes, 2 per table group Black or white construction paper newspaper plastic food wrap or wax paper aluminum foil clear tape Scissors Protractor

    11. Directions- Control Solar Oven Start with 10 pizza box with three sides of the square top already cut, and fold the flap back along the uncut edge. Cover the inside of this flap with aluminum foil, using tape to hold the edges securely. Line the inside bottom of the box with black construction paper. Use tape to hold the edges down. Create insulation by rolling up some newspaper (about 1 inch thick) and fitting it around the inside edges of the box. Tape one piece of plastic wrap (stretched tightly) to the underside of the lid opening, to cover. Tape another piece on the top of the lid opening, to create a layer of insulation that will help hold the heat in the box. Repeat process changing one variable in the oven design. Prop the box at a 60 angle facing the sun using your protractor to measure. Tape to hold at that angle using a piece of newspaper (outside, tomorrow).

    12. Variable Solar Oven Repeat the directions for the Control Solar Oven changing only one of the variables: White construction instead of black construction paper for bottom of oven or Dull side of aluminum foil instead of shiny side for top of oven or Shredded newspaper instead of rolled newspaper for insulation or Wax paper instead of clear plastic wrap for cover of oven Why do we change only one variable?

    14. Completed Oven

    15. Discussion and Reflection Do you think your variable change oven will cook the smores more or less quickly than the control oven design, and why? How do these various concepts of heat transfer, renewable energy and the scientific method all tie together in the solar oven project? List some ways solar energy is transferred to electrical energy. Tomorrow we will cook the smores and record the results/observations.

    16. Solar Oven Lab DAY 2 Cooking, Eating, and Concluding!

    17. Your 2 Solar Ovens are now complete! Your control oven made exactly according to the directions Your variable oven with only one variable changed.

    18. Making your Smores Ingredients: 2 graham crackers 4 mini marshmallows 1 square of chocolate 2 smores in the control oven and 2 smores in the variable oven per team Place 1 graham cracker in the oven. Put 4 mini marshmallows on top of the graham cracker. Cover the marshmallows with a square of chocolate. Cover the chocolate with the other graham cracker

    19. Conducting your experiment Place your ovens side by side outside facing the sun. We will cook our smores for 7 minutes. After 7 minutes, open the ovens and compare the smores. #5: Observations: Make observations using your five senses about the smores. Eat your smore #6: Decide as a team, which oven produced the best tasting smore and why.

    20. Making a conclusion. Re-read your hypothesis and answer these questions on your paper: #6: Based on the results of your experiment, was your hypothesis supported? Why or why not? #8: What would you do differently next time? #9: What foods do you think would cook well in your solar oven. #10: Design a different solar oven that you think would work better. Sketch and label your oven. Turn in your paper ?

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