Solar  Oven
The Challenge:

To show how the sun can be used to cook food.

Objective: Students will:

determine the solar potential of their site.
track the sun’s path during the 09:00 to 14:00 time period.
study the Green House effect.
bake cookies using the solar oven.

OR - State Standards:
ENERGY

Understand energy, its transformations, and interactions with matter.
Compare forms and behaviors of various types of energy.
Distinguish between the forms of energy including heat, chemical, mechanical, and gravitational potential energy
Trace the flow of energy transformations in a system.
Explain the principle that energy is conserved, neither created nor destroyed.
Identify how technological advances have changed humankind’s use of energy
Time: 4, 40-minutes sessionsbrief periods during the 09:00 to14:00 time period

Materials:

Sun angle charter
Thermometers (also used in solar collectors)
Solar oven

Procedure: Day One:

Introduce the idea of the potential uses of solar cookers. Choose video coverage from Haiti to show how ovens are used. http://www.sunoven.com/media/pages/Media%20Coverage.html

Day Two:

Use the Sun Angle Chart to determine the best location for the Sun Oven

Show picture of the use of the “charter”.

Day Three:

Use empty water bottles to explore the green house effect. Cut a 3 inch by 4 inch hole in half of the bottles

Picture

Use black duct tape on half of each water bottle.

Picture

Insert a thermometer into the neck of each bottle, set in sun, and record temperatures for ten minutes.
Temperature Measurements
Minutes
Degrees
1
2
3
4
5
6
7
8
9
10

Possible discussion questions and answers:

Q How are the two bottles different? A Open at top.

Q Why is the black tape used? A Absorbs light energy.

Q Why doesn’t the light energy just go back into space? A It is converted into heat and the heat rays are too long to pass through the plastic and are trapped. This is the Greenhouse Effect.

Day Four:

Assemble the Sun Oven and position in the sun space students have determined during Day Two. Select a recipe from this list to cook for the class.

http://www.sunoven.com/usa/recipes.php



Attachments
•SunOven.pdf

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