Keeping things cool is a Keeping things cool is a huge industry! huge industry! • Insulation is needed in everything from Insulation is needed in everything from the walls of your house, to the coffee the walls of your house, to the coffee mugs everyone carries around. mugs everyone carries around. • Yeti alone sells over half Yeti alone sells over half a a billion billion dollars dollars worth of coolers a worth of coolers a year. year. That’s not That’s not counting other big names like Igloo or counting other big names like Igloo or Coleman! Coleman!
That’s a pretty big deal! That’s a pretty big deal! • To To keep up with competition, these companies keep up with competition, these companies employ engineers employ engineers and scientists in order to help and scientists in order to help create and test new insulating create and test new insulating technologies. technologies. • Let’s see how other projects have applied the Let’s see how other projects have applied the engineering design process to create a cooler engineering design process to create a cooler made out of hemp and flax! made out of hemp and flax!
Initial failures Initial failures • First attempt First attempt the class the class used a used a Styrofoam Styrofoam cooler as a mold but cooler as a mold but due to the pressure needed to due to the pressure needed to create a compression for curing, create a compression for curing, the the cooler cooler collapsed. collapsed. • In the second In the second attempt attempt , they used , they used wooden blocks to form a wooden blocks to form a cooler cooler along with a foam along with a foam mixture. We mixture. We were able to get a solid shape were able to get a solid shape but but it was it was hard to remove the wooden hard to remove the wooden forms without breaking the mold. forms without breaking the mold.
Final cooler Final cooler
Cooler Challenge! Cooler Challenge! Today you are going to apply the engineering Today you are going to apply the engineering design design process to create a cooler to keep your process to create a cooler to keep your Popsicle and Popsicle and ice cube nice ice cube nice and cold while we learn more about and cold while we learn more about wind wind energy energy—because because no one wants warm popsicles! no one wants warm popsicles! But But before we can start any of that we need to learn before we can start any of that we need to learn more about heat and insulation…. more about heat and insulation….
What makes good What makes good insulation? insulation? • First, we have to know the difference between First, we have to know the difference between insulators and conductors. insulators and conductors. • Second, we have to know how heat actually Second, we have to know how heat actually moves. moves.
Conductors Conductors vs. vs. Insulators Insulators Conductors Conductors Insulators Insulators • Material which allows energy Material which allows energy • Material which does not easily Material which does not easily to pass through easily to pass through easily allow energy to pass allow energy to pass through through • Weak Weak covalent covalent bonds bonds • Strong covalent bonds Strong covalent bonds • Freely moving electrons Freely moving electrons • Electrons do not move freely Electrons do not move freely
How does heat move? How does heat move? • Radiation Radiation - a method of heat transfer that does not rely upon any contact between the heat heat source and the heated object, opposed to conduction and convection. • Convection Convection - transfer of heat from one place to another by the movement of heated fluids, such as air or water, that carry thermal energy away from the source. • Conduction Conduction - the movement of heat from one solid to another one, which have different temperatures when they are touching each other.
Bill Bill Nye discusses heat Nye discusses heat https://www.youtube.com/watch?v=WMYb5684Kp0 https://www.youtube.com/watch?v=WMYb5684Kp0
Cooler Challenge! Cooler Challenge! Now that you have some background on the Now that you have some background on the conductors and insulators, your challenge is to design conductors and insulators, your challenge is to design a cooler using the supplies provided to keep your a cooler using the supplies provided to keep your popsicle and ice cube popsicle and ice cube cold. cold. Grab your supplies and Grab your supplies and start on start on your your design! design!
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