## Applied STEM

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# Thermal Design

This is part two of the Thermal Design activity

For the second part of our Thermal Design project, think about the successes and failures from the previous attempts to design and build a device that protects an object from the transferrence of heat.

If you remember, many of the designs exposed the bolt directly to the heat source, and did not survive very long.

From our last session on Thermal Protection, conduction permitted heat to flow directly from the heat source up the bolt, and melt the hot glue within a minute or so. A design that includes a way for the heat to be diverted away from the bolt will probably be more successful.

Remember the definitions of the three words we learned so far regarding this experiment:

Conduction

Convection

Here are some more words regarding heat :

Ablation

Heat Source

Heat Sink

Absorption

Reflection

Thermal Conductors

Thermal Insulators

The Assignment for Part Two:

1) On the reverse of your TPS Design Specifications Sheet, Draw a new Thermal Protection System in the drawing box.

2) Describe the key features of your design.

3) Once the drawing and key features are complete, show your TPS Sheet to the instructor for credit on this part of the project. Your TPS Sheet will be given back to you when we build our designs.

4) On the day we build our designs, obtain materials and begin building. Be sure to put your names on your design.

5) Only classroom-provided materials will be used.

If you complete your design, bring it to the front of the class for testing.

All designs will be tested after most students have completed fabricating their design.

Completing both sections of the TPS Sheet is worth 100 points

A complete White Paper to spec. is worth a total of 200 points.

A design that survives sixty seconds earns 100 points

A design that survives two minutes earns 50 extra credit points

A design that survives three minutes earns 100 extra credit points

A design that survives five minutes earns 150 extra credit points

Notes:

Only one drop of hot glue is needed to adhere the bolt to the wooden dowel.

The hot glue and the wooden dowel must be exposed and observable: no screen or foil should cover the hot glue or dowel.

No hot glue is to be used elswhere on or in your design. Designs that catch fire and/or burn because hot glue was used elswhere in your design earn no credit on any portion of this activity, and will earn those students a suspension from class.

The use of materials outside of what has been provided in class is considered cheating and will earn no credit. Designs may be dismantled after testing to verify for the use of proper materials.

One minute, or hundred points is considered minimally adequate for this project. Extra minutes earn extra credit and will be added to your total for this quarter.

If your design is completed and ready for testing before other students have completed theirs, you may work on your Preferred Activity projects.