Thermodynamics Insulation
Problem
We had to design insulation for a 15cmx15cmx17cm box with a 25 watt light bulb inside.
Constraints
The insulation only had to cover the top of the box and to be an inch thick or less. The material had to be recyclable, economical, and be environmentally friendly.
Calculations
We had to find the mass of the air being heated we used mass=volume*density
How much energy was gained and lost during heating and cooling we used Q=m*c*T
Q-heat transfer
m-mass
c-heat capacity
delta T- change in temperature
How much energy was gained and lost during heating and cooling we used Q=m*c*T
Q-heat transfer
m-mass
c-heat capacity
delta T- change in temperature
Final DesignThe order of the material from top to bottom
1) Contents of a vacuum cleaner 2) Cotton balls 3)carboard All of this in a cotton ball bag holding everything in |
Our Data from our insulation comparied to another groups. The red line is the thermoniter inside the box and the blue is outside the heated area. The light thin colored lines is our insulation. the dark thicker lines are the other groups
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Reflection
In this lab we learned how thermodynamics worked in the real world not just on a piece of paper with equations. Our insulation wasnt the best but it still kept the box a little warm afterwards. I think we could have done a better job using aluminum instead of vacuum contents. Our design compared to others was...
Q (net): 59 ΔT (max) = 25.6 (my team)
Q (net): 20.3 ΔT (max) = 24 (team 1)
Q (net): 17.5 ΔT (max) = 9.6 (team 2)
Q (net): 59.46 ΔT (max) = 25.6 (team 3)
Q (net): 59 ΔT (max) = 25.6 (my team)
Q (net): 20.3 ΔT (max) = 24 (team 1)
Q (net): 17.5 ΔT (max) = 9.6 (team 2)
Q (net): 59.46 ΔT (max) = 25.6 (team 3)
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