This document describes a student's process of designing and testing two solar oven designs. The first design used white cloth and foam as insulating materials. It reached a maximum temperature of 73.4°C during testing but did not retain heat well in the shade. The second design replaced the cloth with sand, but temperatures only reached 37.4°C and cooled faster than the first design. In reflection, the student determined that the original cloth and foam were better insulating materials than the sand.

1. Making a solar oven by:Trey
Monday, May 20, 13

2. Imagine for design #1
Idea #1
Our material are white cloth and white foam
We need 3 units
The advantage of this idea is all of the materials are
insulators.
The disadvantage of this idea is that the foam is a bit
far away from the least environmental impact.
Monday, May 20, 13

3. Imagine for design# 1
idea #2
Our materials are two units of newspaper and one unit of
pipe insulation
We need 3 units
The advantage of this idea is that the pipe insulation is
thick and colored black which attracts light
Our disadvantage of this idea is that the pipe insulation is
second the last with hurting the environment.
Monday, May 20, 13

4. Plan for design #1
Top view
Cloth
Foam
Pot
Monday, May 20, 13

5. Plan design #1
Side view
Cloth
Foam
Pot
Monday, May 20, 13

6. Plan for design #1
White cloth 2 units = 2 sheet Shred it
White foam 1 unit = 1 sheet Shred it
Monday, May 20, 13

7. Improve
The total score for our first solar oven was 15 points
The parts of our solar oven design that worked well
were were good insulators and we had a flat foil paper
that reflects good.
The parts of our solar oven design that did not work
well were the inside because we were near the shade.
We will Improve our heat score by using better insulates.
Monday, May 20, 13

8. Solar oven testing in the sun
Time Temperature
0 min 25 0c
5 min 58.9 0c
10min 65.0 0c
15 min 73.4 0c
20 min 69.4 0c
25 min 70.0 0c
Monday, May 20, 13

9. Solar oven testing in the shade
1 59.0°c
2 48.2°c
3 40.3°c
4 34.4°c
5 32.5°c
Monday, May 20, 13

10. Create
Our heat score is our solar oven maximum
temperature subtracted from the control oven 73.o
°c = 55.0°c = 18.0°c
Our time score is the number of minutes it took to
cool down was four minutes
Our total impact score was 7 points
Our total score for the solar oven is 15 points
Monday, May 20, 13

11. Impact score for design #1
Design #1 Reduce
Natural or
processed
Reuse Recycle Total points
White foam
4
points
+1 point
process
ed
+1 point
No
-1 point
yes
5 points
White cloth 1 point
+ 1 point
process
ed
- 1 point
yes
+ 1 point
No
2 points
Monday, May 20, 13

12. Plan for design #2
Top view
Monday, May 20, 13

13. Plan design #2
Side view
Monday, May 20, 13

14. Plan for design #2
Material Units
How will you use the
material
Sand 1
Put around the
cup
Foam 2 Reuse
Monday, May 20, 13

15. Impact score for design #2
Design
#1
Reduce
Natural or
processed
Reuse Recycle Total points
Sand 1 unit
-1 point
natural
Yes -1 point Yes-1 point -2 points
Foam 4 unit
+1 point
processed
No + 1 point No +1 point 7 points
Monday, May 20, 13

16. Solar oven testing in sun
Time Temperature
0 min 24.4 °c
5 min 32.1 °c
10 min 36.1 ° c
15 min 36.0 °c
20 min 37.4 °c
25 min 37.4 °c
30min 37.2 °c
Monday, May 20, 13

17. Solar oven testing in shade
Time Temperature
1 min 37.1 °c
2 min 34.8 °c
3 min 34.2 °c
4 min 34.2 °c
5 min 33.1 °c
6 min 31.6 °c
7 min 30.6 °c
8 min 30.2 °c
9 min 29.7 °c
10 min 29.5 °c
Monday, May 20, 13

18. Create for design #2
Our heat score is our solar oven maximum
temperature subtracted from the control oven:
37-53 = 16
Our time score is the number of minutes it took to
cool down which was 10 minutes
Our total impact score was 5 points
Our new total score for the solar oven is -11
Monday, May 20, 13

19. Reflection
Our improved design did not work well because the
sand was not a good insulator because our temperature
decreased . The materials we changed were cloth which
was a good insulator because our temperature
increased. We changed the cloth though because we
thought the sand would heat up like at the beach.
If we could improve again we would change it back to
cloth and foam because they were better insulators.
Monday, May 20, 13