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Engineers, what is wrong here?

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Title: Engineers, what is wrong here? Author: Chris Last modified by: Dave Created Date: 6/1/2013 6:25:32 PM Document presentation format: On-screen Show (4:3) – PowerPoint PPT presentation

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Title: Engineers, what is wrong here?


1
Engineers, what is wrong here?
2
There are penguins all over the world, not just
in Antarctica.
The red dots indicate where penguins live. There
are penguins all over the southern
hemisphere. Even in South Africa
3
Boulders Beach is on the coast of South Africa.
Here, the Boulders Beach penguins live. As the
climate across the globe changes, these penguins
are getting hot. To keep from overheating, they
cool off in the water. But this survival
technique has not worked in their favor
4
Boulders Beach Penguins
So the park rangers have built the penguins
little houses to protect their eggs AND to help
keep them cooler.
The sea gulls are stealing their eggs!
This is helping them survive!
5
Climate change is causing penguins in Antarctica
to become endangered by eliminating available
habitats
6
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7
How bad is climate change?Are we to blame?
8
But how can we help?
For starters, we can conserve energy so we dont
use as many fossil fuels in power plants! But
that will take some time!
What can we do at home to help the penguins?
9
How can we help them now?
  • Challenge Can you design a dwelling that will
    protect your penguin from increasingly warmer
    temperatures?

10
Review of Thermal Energy Transfer
  • Conduct the following experiments to gain a
    better understanding of thermal energy transfer,
    insulators, and conductors.

11
Insulation and ConductionSoda Cans
  • You are leaving on a field trip and you want to
    keep your soda cold, but ice packs are not
    allowed. What can you wrap the can in to keep it
    cool?

12
Materials
  • Predict which material you think will keep the
    soda can colder longer?
  • A wool sock, paper towel, aluminum foil, plastic
    wrap, cotton sock, nothing
  • Starting temperature of can 42 degrees F

13
Insulators and Conductors- Soda Cans
14
  • Which material appears to work the best?
  • Wool
  • Which material appears to work the least?
  • Cotton sock
  • When you wrap a can of soda, what are you really
    trying to do?
  • Keep the heat out, not keep the cold in
  • From the data collected, how would you rate
    aluminum foil? Why?
  • Not very good, it is a metal and good conductor
  • What is the best fabric to wear in the winter to
    keep you warm?
  • wool, because it traps air and doesnt absorb
    moisture

15
Metal vs. Other Materials
  • Preview Which tray is colder?
  • Watch the video, why dont the ice cubes melt at
    the same rate? https//www.youtube.com/watch?vrrY
    AmEptMLQ

16
Battle of the Spoons
  • Predict Which spoon (silver or plastic) will
    keep an ice cube from melting faster?

17
  • Which spoon is causing the ice cube to melt
    faster? Why?
  • Metal, It is conducting heat from my hand through
    the spoon and melting the ice cube.
  • Why didnt the other spoon melt the ice cube as
    fast?
  • The plastic spoon does not transfer heat well
  • Which spoon is a conductor?
  • Metal
  • Which spoon is an insulator?
  • Plastic

18
Draw
Metal Spoon Heat is conducted from my hand, along
the metal, which is a conductor, to the ice cube,
which melts
Plastic Spoon Heat is NOT conducted from my hand,
since plastic is an insulator. The ice cube does
not melt
19
Tray temperatures
  • What are the actual temperatures?
  • So why does the metal feel colder?
  • It conducts heat away from your hand quickly

20
Explain the melting ice blocks
  • The blocks are made of different materials. The
    fast melting cube was on a good conductor
    (metal). The slow melting cube was on a good
    insulator (wood, plastic).

21
Hot House
  • How can conduction, convection, and radiation all
    come from a single source?

22
Data Collection
23
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24
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25
  • What method of HEAT TRANSFER is heating up the
    attic?
  • Conduction- The attic gets hot because the hot
    roof (esp the black roof) is absorbing the light
    and it transfers its energy directly to the attic
  • What method of HEAT TRANSFER is used when we
    FLIPPED the house?
  • Convection- the cold, dense air will sink and the
    warm air will rise 
  • What method of HEAT TRANSFER is blocked when we
    covered the house with the space blanket?
  • Radiation- the heat instead of being absorbed is
    reflected away

26
Brainstorm
  • Using your knowledge of insulators, conductors,
    conduction, convection, and radiation, design a
    dwelling for your penguin which will prevent it
    from melting under the sun.

27
Materials
  • What type of materials will you use?
  • Cotton, wood, construction paper, foam, felt,
    plastic wrap, aluminum foil

28
Design
  • What will your design be? Remember your penguin
    has to be able to get into and out of your
    dwelling.

29
Are you designing a home for winter heat losses?
What do you think the arrows represent?
Convection
Where is the heat going?
Radiation
Conduction
30
Or for summer heat losses?
Convection
In the summer, its HOT! Heat transfers into our
houses!
Radiation
Now where is the heat going?
Conduction
31
We need to slow down heat transfer.
In other words, we need to stop the from
happening!
Radiation
Conduction
Convection
32
Test Oven
  • Radiation from heat lamp above
  • Conduction and convection from black floor
  • Convection and radiation from 4 shiny foil walls

33
Conserving energy is the key to help
Save the Penguins
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