The document describes a student's design of two solar ovens using different materials. For the first design, materials used were shredded foam, felt, and cloth, which achieved a total score of 7. The second design used cloth, newspaper, and cotton balls but only achieved a score of 1. The student reflects that the first design worked better because those materials trapped heat better than the ones used in the second design.

1. Designing a solar oven
By: Cruz Flores
Monday, May 20, 13

2. Imagine for design #1
Idea #1
Our materials are shredded foam we
put it on the bottom shredded felt we
put it on sides and we also needed
shredded cloth and we out it on the
opposite sides.
We needed 1 unit of everything.
The advantages of this idea is most of
our materials are insulators, there
fore keeping the heat inside, and most
are in the least environmental impact.
The disadvantages of this idea is foam
has a big environmental impact.
Monday, May 20, 13

3. Imagine for design #1
Idea #2
Our materials are shredded cloth on
tow sides also shredded felt on the
bottom and shredded with foam on
the other sides.
We needed 1 unit for everything.
The advantages of this idea is these
are insulators and they have little
environment impact.
The disadvantages of this idea is
we would prefer to use three
different materials but the third
material had to much environment
impact so we chose a different one.
Monday, May 20, 13

4. Plan for design #1
Monday, May 20, 13

5. Plan for design #1
Monday, May 20, 13

6. Plan for design #1
Materials
How many units will
you need?
How will you use the
material?
Cloth 1 unit = 1 sheets Shred
Felt 1 unit = 1 sheets Shred
White foam 1 unit Shred
Monday, May 20, 13

7. Impact score for design #1
Design #1 Reduce Natural or
Processed
Reuse Recycle Points
Cloth 1 unit Processed Yes No. 2pts.
Felt 1 unit Processed No No 4pts.
White
foam
1 unit Processed No Yes 2pts.
Monday, May 20, 13

8. Solar oven testing in the
sunTime Temperature
0 minutes 25°C
5 minutes 38.9°C
10 minutes 47.7°C
15 minutes 50.0°C
20 minutes 54.3°C
25 minutes 65.5°C
Monday, May 20, 13

9. Solar oven in the shade
Time (minutes) Solar Oven Temperature
1 minute 63.8°C
2 minutes 50°C
3 minutes 40.5°C
4 minutes 33.6°C
5 minutes 31.4°C
Monday, May 20, 13

10. Create for design #1
Our heat score is our solar oven maximum temperature
subtracted from the control oven: 66°C - 55°C = 11°C.
Our time score is the number if minutes it took to cool
down which as 4 minutes.
It total impact score was 8 points.
Our total score for the solar oven is 7.
Monday, May 20, 13

11. Improve for design #1
The total score for our first solar oven was
7.
The parts of our solar oven design that
worked well were out insulator worked
very well because they were light colors.
The parts of our solar oven design that did
not work well were the plastic would
always fall from the hole in the box
because we didn't tape it well.
We are going to try to improve our heat
score and our impact score.
We will improve these scores by using
different insulators that don't have a lot of
impact. W can also use darker materials.
Monday, May 20, 13

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

13. Plan for design #2
Monday, May 20, 13

14. Plan for design #2
Materials
How many units
will you need?
How will you use the
material?
Cloth 1 unit = 1 sheets Shred
Newspaper 1 unit = 1 sheets Crumple
Cotton 1 unit = 1 sheets Pull/shred
Monday, May 20, 13

15. Plan for design #2
Design #2 Reduce
Natural or
processed
Reuse Recycle Points
Cloth 1 unit Processed Yes No 2pts.
Newspaper 1 unit Processed Yes Yes 0pts.
Cotton balls 1 unit Processed No No 4pts.
Monday, May 20, 13

16. Solar oven testing in sun
Time Temperature
0 minutes 24.4°C
5 minutes 40.5°C
10 minutes 39.0°C
15 minutes 36.2°C
20 minutes 38.8°C
25 minutes 54.4°C
30 Minutes 55.6°C
Monday, May 20, 13

17. Solar oven testing in Shade
Time (minutes) Temperature
1 minute 30.0°C
2 minutes 30.0°C
3 minutes 30.0°C
4 minutes 29.3°C
5 minutes 28.4°C
6 minutes 27.2°C
7 minutes 26.3°C
8 minutes 25.8°C
9 minutes 25.8°C
10 minutes 26.4°C
Monday, May 20, 13

18. Create for design #2
Our heat score is our solar oven maximum
temperature subtract from the control oven:
56°C-53°C=3°C.
Our time score is the number of minutes it took to
cool down which was 4 minutes.
Our total impact score was 6 points.
Our new total score of the solar oven is 1.
Monday, May 20, 13

19. Reflection
Our improved design did not work well because the materials
we used did not trap the heat in that much.
The materials we changed were poor insulators because the
total score from last time was 7 and the second time we did
are design the total score was 1. Also cotton let the heat in
that much and the newspaper let the heat pass through that
much. Also there wasn't that much cloth so I think it didn't get
a lot of heat.
If we could improve it again, we would use the same materials
as the first time because are score was 7 the first time and
the second time are score was 1 so we could of stayed with
the same materials in the first time. The materials we were
used are cloth, foam, and felt.
Monday, May 20, 13