Presentation on theme: "Physics To Win It: Heat Is on challenge"— Presentation transcript:
1 Physics To Win It: Heat Is on challenge Solar Oven Ideas
2 Why Solar Ovens http://www.youtube.com/watch?v=s hqgNSC1O3M Pizza Box Go GreenNature Conservancy: HaitihqgNSC1O3MPizza BoxbwliZJiHe8
3 Your MissionTo design a solar oven that will create the most thermal energy in 45 minutes using common supplies (cardboard boxes (shoe box, pizza box, larger box, etc.) tin foil, plastic wrap, newspaper, etc.)You must work in groups of 3 or 2 (need team name)You will calculate volume of oven (minimum of 1,000cm3, joules of energy converted, and power of ovenYou can choose to bring ingredients from the provided recipes (only) to make something for your group/self
6 Provided Items Tin foil (about 4 sheets (8.5x11)) Plastic wrap (about 4 sheets of 8.5x11)2 sheets black paper (which I would like back at the end)Glue, staples, tape (not very strong)
7 Items Your Team Must Provide The container (be creative!)Extra tin foil (if needed)Extra plastic wrap (if needed)Insulation (if needed)Substitutes for any of the above materials (for example: if you want plexi-glass or something more heavy duty then plastic wrap)Any pre-cooked food items (basically we are only melting or re-heating foods for safety reasons, must come packaged)
8 WARNINGS:Please use caution when cutting cardboard, especially with sharp scissors or exacto knivesPlease only bring food that is pre-cooked and packagedDO NOT LOOK DIRECTLY AT THE SUN!
9 Calendar of Events4/2/13 Tuesday: Create Teams, Team Name, Brainstorm Ideas, preliminary list of materials4/8/13 Monday: GUARDIAN SIGNATURE is REQUIRED. In class time to research design and materials wanted4/9/13 Tuesday: Final proposal of design, materials, and recipe (if cooking food)4/16/13 Tuesday: ALL MATERIALS DUE (in class time to assemble solar oven)4/17/13 Wednesday: COMPLETED SOLAR OVEN DUEHEAT IS ON CHALLENGE DAY: TBD because of weather (hopefully 4/17/13 Wednesday)
10 Rough Draft Proposal Team Name: Team Members: Possible Materials, quanities and Rational/Explanation FOR ALL MATERIALS DESIRED:Design Sketch and LABELED!MaterialQuantityRational (why this material?)
11 Grading Requirements For Each Group Materials Proposal/Solar oven trial 1 (requirements coming) 20pts.Solar Oven, materials must be approved before hand (rough draft proposal) 20pts.(temperature must be raised to at least 100 degrees F )Calculations and final conclusion questions 10pts.
12 Final Proposal Team Name: Team Members: Hypothesis: estimated final temperature _______Possible Materials, quanities and Rational/Explanation FOR ALL MATERIALS DESIRED:Design Sketch and LABELED!MaterialQuantityPurpose / or why this material
13 Warm-up 4/8/13Teach the Teacher: Would you rather be caught picking your nose or picking a wedgie?Review: For every action there is an _______ and equal reaction.
14 Warm-up 4/11/13Teach the Teacher: What is the best thing to do on a snow day?Review: What kind of energy does the sun produce (fission or fussion?)
15 Teach the Teacher: What is the best kind of cookie? Warm up 4/12/13Teach the Teacher: What is the best kind of cookie?Review: What is the units for energy?
16 Warm-up 4/16/13Teach the Teacher: What was your favorite movie when you were kid?Review: What is the definition of temperature?
17 Warm-up 4/15/13Teach the Teacher: What is the best place to take little kids in Rapid?Review: What is newton’s first law?
18 Warm-up 4/18/13Teach The Teacher: What is the most annoying animal?Review: What is the gravity #?
19 Warm-up 4/19/13Teach the Teacher: How do you like your eggs cooked (scrambled, sunnyside, etc)?Review: What is specific heat?
20 Warm-up 4/25/13Teach The Teacher: What is the worst house chore?What is the best?Review: What exactly does temperature measure?
21 Warm-up 4/26/13Teach the Teacher: What is the song of choice today?Review: What type of energy depends on your position(height)?
28 Dice it!Examples of things that need electricity
29 Dice ItExamples of things that have potential energy
30 What did they learn they can and can’t do? Rules?IDs?Security guards?How to be successful?How to deal with drama?How to pass classes?Clubs to join?Activities to go see?What’s the best lunch? How to make new friends? Students can be as creative/funny as they want and still be appropriate.
31 Warm-up 4/30/13Teach the Teacher: What kind of tattoo should I get?Review: What is thermal energy?
32 Solar Oven Trial 11.What were some (at least 2) environmental factors that affected the heat in your oven? Brainstorm ideas to counteract these environmental factors next time.2.What design modifications would you make to improve your oven’s maximum temperature?
33 Warm-up 5/1/13Teach the Teacher: Any May Day stories?Review: What happens to particles in conduction?(mosh pit)
34 Warm-up 5/2/13Teach the Teacher: What is the best kind of doughnut?Review: What is convection?
35 Warm-up 5/3/13Teach the Teacher: Would you rather always have sticky fingers or always have bad breath…Review: What is the difference between conduction and convection (mosh pit vs. lava lamp)?
36 Warm-up 5/6/13Teach the Teacher: Who is the best super villain?Review: What is it called when Thermal Energy moves from a warm to cold substance?
37 Warm-up 5/7/13Teach the Teacher: What has been the best assignment of your freshman year?Review: What is the kinetic and potential energy of particles in an object.
38 Solar Oven Trial 11.What were some (at least 2) environmental factors that affected the heat in your oven? Brainstorm ideas to counteract these environmental factors next time.2.What design modifications would you make to improve your oven’s maximum temperature?
39 Warm-up 5/8/13Teach the Teacher: Would you rather have a long summer break, or have a winter and summer break?Review: Mechanical energy is what two things added together?
40 Warm-up 5/9/13Teach the Teacher: Do you like to eat fish?Review: Temperature actually measures this……
42 Heating SystemsHeating systems vary depending on climateBefore only stoves/fires used to heat: but is a slow process
43 Forced Air SystemsFurnace warms air, then spreads air using ducts and ventsCool air isreturned to beheated againMost commonin US
44 Radiator SystemsClosed metal container with hot water or steamThrough conduction, thermal energy passed to the surrounding air
45 Electric Heating Systems Electric coils in floors heat surrounding airby conduction,then convectioncurrents heats therest of the room
46 Solar HeatingBuildings use the sun’s radiation in 2 waysPassive: materials easily absorb radiation and heat naturallyActive solar: solar cells
47 Need lots of south facing windows Passive Solar Heating
48 Active Solar HeatingUses solar collectors, photovoltaic (PV) cells, or solar panels to create electricity or warm water to radiate heat
49 ThermodynamicsThe study of how thermal energy, heat, and work are relatedHeat and work increase TEHeat can only move from warm to cold, unless work is done (think about rubbing your hands together)
50 Converting Heat to Work Heat engine: converts thermal energy to mechanical energyME=____+_____Internal Combustion Engines: fuel is burned inside cylinders and turn heat to workj8QvsiAdUConverts only 25% of heat to mechanical energy- 75% of heat is lost (that’s why coolant is needed!)
51 Heat MoversHeat movers move TE from one location to another at a different temp
52 Heat Mover: Refrigerators Does work so that heat can move from inside refrigerators to outsideNeeds coolant: evaporates at a low temperatureLiquid coolant->gas (cool)->pumped to coils in fridge and TE goes from warm to cold->warm gas compressed doing work-> becomes warmer then outside air and heat flows to outside air, process starts all over again.
53 Air Conditioners and Heat Pumps Air conditioners: Work like refrigerators, just does the oppositeHeat pump: can cool and warm air
54 Human CoolantAs sweat evaporates absorbs TE, taking heat away from your body
55 Match it Words!TemperatureSpecific HeatInsulatorCombustionConductorThermal EnergyConvection CurrentsKinetic EnergyConductionRadiationHeat