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Using Energy from the sun. converting energy from one form to another. objectives. By the end of this lesson you will be able to say “I can…” build a device that converts light into heat. Explain the principles of heat transfer including convection, conduction, and radiation. - PowerPoint PPT Presentation
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USING ENERGY
FROM THE SUNCONVERTING ENERGY FROM ONE FORM TO
ANOTHER
OBJECTIVES
BY THE END OF THIS LESSON YOU WILL BE ABLE TO SAY “I CAN…”
• BUILD A DEVICE THAT CONVERTS LIGHT INTO HEAT.
• EXPLAIN THE PRINCIPLES OF HEAT TRANSFER INCLUDING CONVECTION, CONDUCTION, AND RADIATION.
• EXPLAIN WHY CERTAIN MATERIALS INCREASE OR DECREASE HEAT.
• EXPLAIN THE BENEFITS AND DISADVANTAGES TO SOLAR COOKING.
FOOD FOR THOUGHT….
• HOW CAN YOU USE THE SUN TO COOK FOOD?
• WHEN WOULD YOU EVER NEED TO USE THE SUN TO COOK FOOD?
• WHAT ARE SOME WAYS YOU CAN THINK OF TO USE THE SUN TO COOK FOOD?
THE THREE TYPES OF SOLAR COOKERSPANEL STYLE COOKERS
BOX-STYLE COOKERS
PARABOLIC COOKERS
TIMELINEMATERIALS ALREADY AVAILABLE:
• OVEN THERMOMETERS
• REYNOLDS OVEN COOKING BAGS
• PLASTIC WRAP
• ALUMINUM FOIL
• BLACK CONSTRUCTION PAPER
• MASKING TAPE
• SUN SHADE
Day 1 Day 2 Outside of class
Day 3
Introduction to solar cookers
Bring materials needed to class
Finish building solar cooker.
Test solar cookers.
Student research and draft design of cooker
Build solar cookers
Refine it using principles you’ve learned.
Measure temperature increase every 10 minutes.
Develop materials list
Make sure your space is clean and you solar cooker is in a safe place.
Complete and turn in Student Guides.
PART 1: STUFF YOU SHOULD
KNOWPRINCIPLES THAT WILL HELP YOU BUILD A BETTER
SOLAR COOKER
CONVECTION, CONDUCTION, RADIATION
Radiation
ConductionConvection
Convection Conduction Radiation
Currents are created when there are differences in temperature and density within a fluid or gas.
The transfer of heat by direct contact between two materials with different temperatures.
The movement of heat waves.
GIVE EXAMPLES OF…Radiation Convection Conduction
SOLAR COOKING TIPS
•CONCENTRATE THE LIGHT
•CONVERT THE LIGHT INTO HEAT
•CAPTURE AND RETAIN THE HEAT
WHAT CAN YOU DO TO CONVERT THE MOST LIGHT INTO HEAT?
WHAT CAN YOU DO TO CONCENTRATE THE LIGHT?
WHAT CAN YOU DO TO CAPTURE AND RETAIN HEAT?
BREAK INTO GROUPS
DEVELOP AND DESIGN YOUR GROUP’S SOLAR COOKER.
DEVELOP YOUR MATERIALS LIST.
PART 2: SOLAR
COOKING MISSIONBUILD YOUR DESIGN
BRING ME YOUR LIST AND DESIGN TO RECEIVE ANY OF THE FOLLOWING:
• REYNOLDS OVEN COOKING BAGS
• PLASTIC WRAP
• ALUMINUM FOIL
• BLACK CONSTRUCTION PAPER
• MASKING TAPE
• SUN SHADES
PART 3: SOLAR
COOKING MISSIONTEST YOUR SOLAR COOKER
YOUR MISSION: S-MORES
YOUR GOAL IS TO MELT THE MARSHMALLOW AND THE CHOCOLATE (REMEMBER, THEY WILL COOK AT DIFFERENT SPEEDS)
PLACE THERMOMETER INSIDE YOUR SOLAR COOKER.
CHECK AND WRITE THE TEMPERATURE EVERY 10 MINUTES.
MAKE OBSERVATIONS AND ADJUST YOUR SOLAR COOKER AS NEEDED (JUST REMEMBER TO WRITE DOWN MODIFICATIONS).
REVIEW OBJECTIVESCAN YOU BUILD A DEVICE THAT CONVERTS LIGHT INTO HEAT?
CAN YOU EXPLAIN THE DYNAMICS OF HEAT TRANSFER INCLUDING CONVECTION, CONDUCTION, AND RADIATION?
CAN YOU EXPLAIN WHY CERTAIN MATERIALS INCREASE OR DECREASE HEAT?
CAN YOU RELATE THE CHARACTERISTICS OF SOLAR COOKERS TO OTHER SYSTEMS (COOLING AND HEATING OF HOMES)?
CAN YOU EXPLAIN THE BENEFITS AND DISADVANTAGES OF SOLAR COOKING.?