1. Designing a solar oven
By: Paula Valencia
Monday, May 20, 13

2. Imagine for design #1
Idea #1
Our materials are shredded foam on the bottom, shredded
felt on two sides, shredded cotton on the other two sides.
We need one unit from every material.
The advantage of this idea is that most of our materials are
very good insulators, and they have little impact, therefore
giving us a low environmental impact score.
The disadvantage of this idea is that our foam has a big
environmental impact, giving us a high impact score.
Monday, May 20, 13

3. Imagine for design #1
Idea#2
Our materials are shredded cloth on two sides, shredded felt on
the bottom, and shredded white foam on the other two sides.
We need one unit from each of the material.
The advantage of this idea is that these materials are good
insulators and they have little environmental impact
The disadvantage of this idea is that we would have preferred to
have three different materials than these but the ones that we
wanted had too much environmental impact so we chose these
instead.
Monday, May 20, 13

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

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

6. Plan for design #1
Materials Units
We will use the
material by
Shredded cloth One unit
Putting it on two of
the sides of the box.
Shredded felt One unit
We will put the felt
on the bottom.
Shredded white
foam
One unit
On the other two
sides of the box.
Monday, May 20, 13

7. Impact score for design #1
Design #1 Reduce
Natural or
processed
Reuse Recycle
Shredded
cloth
Shredded
felt
Shredded
white
foam
1 unit Processed Yes No
1 unit Processed No No
1 unit Processed No Yes
Total
points
2 points
4 points
2 points
Total impact score 8 points
Monday, May 20, 13

8. Solar oven testing in the
sun
Time Temperature
0 minutes 25° C
5 minutes 38.9°C
10 minutes 47.7°C
15 minutes 50°C
20 minutes 54.3°C
25 minutes 65.5°C
Monday, May 20, 13

9. Solar oven in the shade
Time 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 of minutes it took
to cool down which was 4 minutes.
Our total impact score was 8 points.
Our total score for the solar oven is 7 points.
Monday, May 20, 13

11. Improve for design #1
The total score for our first solar oven was 7 points.
The parts of our solar oven design that worked well were
our insulators because they trapped in the heat very well.
The parts of our solar oven that did not work well was the
plastic covering because it would always fall off the hole.
We are going to try to improve our heat and impact score.
We will improve our heat and impact score by using
different insulators that don't have a lot of impact. Can
also use darker materials because they trap in heat better.
Monday, May 20, 13

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

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

14. Plan for design #2
Material Units
How will you use the
material?
Cloth
Newspaper
Cotton
1 unit = 1 sheet Shredded
1 units = 1 sheets Crumpled
1 unit = 1 scoop Pull/ shred
Monday, May 20, 13

15. Impact score for design #2
Design #2 Reduce
Natural or
processed
Reuse Recycle
Total
points
Cloth
Newspaper
Cotton
balls
1 unit Processed Yes No 2 points
1 unit Processed Yes Yes 0 points
1 unit Processed No No 4 points
Total impact score 6 pointsTotal impact score 6 pointsTotal impact score 6 pointsTotal impact score 6 pointsTotal impact score 6 points
Monday, May 20, 13

16. Solar oven testing in the
sunTime Temperature
0 minutes 16°C
5 minutes 37.4°C
10 minutes 40°C
15 minutes 42°C
20 minutes 40.8°C
25 minutes 44.5°C
Monday, May 20, 13

17. Solar oven testing in shade
Time Temperature
1 minutes 33°C
2 minutes 27.9°C
3 minutes 23.9°C
4 minutes 21.6°C
5 minutes 20.1°C
6 minutes 19°C
7 minutes 18.3°C
8 minutes 17.6°C
9 minutes 17.1°C
10 minutes 16.9°C
Monday, May 20, 13

18. Create for design #2
Our heat score is our solar oven maximum
temperature subtracted from the control oven:
45°C - 41°C = 4°C.
Our time score is the number of minutes it took
to cool down which was 4 minutes.
Our total impact score was 6.
Our new total score for the solar oven is 2 points.
Monday, May 20, 13

19. Reflection
Our improved design did not work well because our score
was low and we do not want a low score. The materials we
changed were using newspaper and cotton instead of felt
and foam as insulators. We changed our insulators hoping
to get a lower impact score on the environment. The
materials were poor insulators because in our first design
our solar oven temperature went up in the 60's but in our
second design the temperature only went up to the 40's.
If we could improve again we would find even better
insulators than the ones on the first design because then we
might go up above the 60's and we would get a higher total
score.
Monday, May 20, 13