The STEM Connection Lesson 8 Big Idea There is a significant relationship between science,...
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The STEM ConnectionLesson 8 Big Idea
There is a significant relationship between science, technology, engineering, and mathematics.
Purpose of Lesson: To apply scientific knowledge to a thermal control system.
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Lesson 8: The STEM Connection
Lesson 8 Big Idea
There is a significant relationship between science, technology, engineering, and mathematics.
Engagement – Students will observe and record what they see when a bimetallic coil is placed on the overhead projector and allowed to warm. Students will speculate what the coil is and what is happening to it.
Purpose of Lesson: To apply scientific knowledge to a thermal control system.
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9/30 Drill
• Observe the demonstration and write what you saw happen.
Engagement
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Exploration
• We will measure the range of the coil by heating and cooling it to some known temperatures.
• The data will be graphed and later used to determine its position at a desired temperature.
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Collect 3 pair of data and graph.
Temperature Angle
32 degrees F 82
75 degrees F 90
380 degrees F 116
Temp. Deg. F
Ang
le
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• Crawlspace vent
Explanation
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Bimetals
• A bimetallic strip consists of two metals that expand at different rates. The difference in expansion causes the metal to bend.
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Metals expand when heated.• How could that help us here?
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The Blackbird's extraordinary performance demanded extraordinary technology. Titanium alloy skin was necessary to resist the 600-degree temperatures caused by air friction at Mach 3.
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• Skin panels had to have moveable joints to accommodate expansion and contraction with temperature changes. (The Blackbird literally grew several inches at Mach 3.) As a result, the SR-71 constantly leaked fuel on the ground. This necessitated a special heat-resistant non-volatile fuel called JP-7, used in no other aircraft.
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Let’s explore the thermal properties of some materials.
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2/10 Copy
• Heat Treating Materials–Annealing - heating a material then
letting it cool gradually will soften it, make flexible.
–Tempering – heating a material then cooling it rapidly will harden it, make brittle
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2/11 Rules and Limits
• Criteria- A desired specification of a product. A rule concerning the outcome. –Ex. The fan must turn on at 130 degrees F
• Constraint – A limit to the design process. –Ex. The system must fit within the roof
space
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• Modeling, testing, evaluating, and modifying are used to transform ideas into practical solutions.
Modeling
Modifying Evaluating
Testing
The cycle ends when the products satisfies all of the goals related to the criteria.
6/6 Drill Copy the Graphic Below
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6/2 Drill
• Identify some other devices (systems) that may use a cooling system similar to our model–Car engine–Laptop computer–Greenhouse