USING ENERGY FROM THE SUN CONVERTING ENERGY FROM ONE FORM TO ANOTHER.

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Presentation transcript:

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. 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?

SOLAR COOKERS Brief video on solar cookers from National Geographic

THE THREE TYPES OF SOLAR COOKERS PANEL STYLE COOKERS BOX-STYLE COOKERSPARABOLIC COOKERS

TIMELINE MATERIALS ALREADY AVAILABLE: OVEN THERMOMETERS REYNOLDS OVEN COOKING BAGS PLASTIC WRAP ALUMINUM FOIL BLACK CONSTRUCTION PAPER MASKING TAPE SUN SHADE Day 1Day 2Outside of classDay 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 cookersRefine 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 KNOW PRINCIPLES THAT WILL HELP YOU BUILD A BETTER SOLAR COOKER

CONVECTION, CONDUCTION, RADIATION Radiation Conduction Convection

ConductionRadiation 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… RadiationConvectionConduction

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 MISSION BUILD 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 MISSION TEST 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 OBJECTIVES CAN 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.?