This document describes Diego's process of designing and testing two solar oven prototypes. The first prototype used shredded white cloth and foam for insulation, achieving a maximum temperature of 73°C and score of 15 points. The second prototype replaced the cloth with sand, which was not an effective insulator as the temperature only reached 39°C, resulting in a lower score of 1 point. Diego reflected that using better insulating materials like foam pipes could improve the design.

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

2. Imagine for design #1
• Idea #1
• Our materials are shredded white cloth
and putting it on the side of the Box. We
are also using shredded white foam and
we are putting it on the bottom of the box.
• We need 1 unit of white cloth and 2 units
of white foam.
• The advantage of this idea is that all of
our materials are insulators and are not
colored.
• The disadvantage of this idea is that the
is a bit far away from the least
environmental impact.
Monday, May 20, 13

3. Imagine for design #1
• Idea #2
• Our materials are shredded newspaper
and we will put it on the bottom of the box.
Our other material is shredded pipe
insulation and we will be putting it on the
side of the box.
• We have 2 units for shredded newspaper
and 1 unit for shredded pipe insulation.
• The advantage of this idea is that the pipe
insulation is thick and colored black which
absorbs heat.
• The disadvantage of this idea is that the
pipe insulation is second to last with
hurting the environment.
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
White cloth 1 unit
We will use
white cloth
by putting
it on the
side of the
box.
White foam 2 units
We will use
white foam
by putting
it on the
bottom of
the box.
Monday, May 20, 13

7. Impact score for design #1
Design
#1
Reduce
Natural
or
processed
Reuse Recycle
Total
points
Shredded
white
cloth
1 unit =
1 point
Our
material
is
processed
+1 point
Our
material
has been
used
before
-1 point
We can
recycle
our
material
+1 point
2
points
Shredded
white
foam
2 units =
4 points
Our
material
is
processed
+1 point
Our
material
has not
been used
before
+1 point
We can
recycle
our
material
-1 point
5
points
7 points7 points7 points7 points7 points7 points
Monday, May 20, 13

8. Solar oven testing in the sun
Time Temperature
0 minutes 25.0°c
5 minutes 58.9°c
10 minutes 65.0°c
15 minutes 73.4°c
20 minutes 69.4°c
25 minutes 70.0°c
Monday, May 20, 13

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

10. Create for design #1
• Our heat score is our solar oven maximum
temperature subtracted from the control oven:
73.0°c - 55.0°c = 18.0°c.
• Our time score is the number of minutes it took
to cool down which was 4 minutes.
• Our total impact score was 7 points.
• Our total score for the solar oven is 15 points.
Monday, May 20, 13

11. Improve for design #1
• The total score for our first solar oven was 15 points.
• The parts of our solar oven design that worked well
were flat foil because it reflected the light good.
• The parts of our solar oven design that did not work
well was the inside because we were near the shade.
• We are going to try to improve our heat score.
• We will improve our heat score by using better
insulators because it will help keep the box warmer.
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
Sand 1 unit
We will use
the sand by
putting it
around the
cup.
Foam 2 units
We will use
the foam by
glueing it
to the
walls and
ground.
Monday, May 20, 13

15. Impact score for design #2
Design
#2 Reduce
Natural
or
processed
Reuse Recycle
Total
points
Sand
I unit
= 1
point
Our
material
is
natural
-1 point
Our
material
can be
reused
-1 point
Our
material
can be
returned
to nature
-1 point
-2
Foam
2 units
= 4
points
Our
material
is
processed
+1 point
Our
material
cannot be
reused
+1 point
Our
material
cannot be
recycled
+1 point
7
5 points5 points5 points5 points5 points5 points
Monday, May 20, 13

16. Solar oven testing in the sun
Time Temperature
O minutes 16.0°c
5 minutes 34.5°c
10 minutes 36.3°c
15 minutes 36.7°c
20 minutes 37.5°c
25 minutes 38.3°c
30 minutes 39.1°c
Monday, May 20, 13

17. Solar oven testing in the shade
Time Temperature
1 minute 31.5°c
2 minutes 28.6°c
3 minutes 26.2°c
4 minutes 24.7°c
5 minutes 23.5°c
6 minutes 22.6°c
7 minutes 22.1°c
8 minutes 21.7°c
9 minutes 21.2°c
10 minutes 20.8°c
Monday, May 20, 13

18. Create for design #2
• Our heat score is our solar oven maximum
temperature subtracted from the control oven:
39.0°c-41.0°c=-3.0°c
• Our time score is the number of minutes it took
to cool down which was 9 minutes.
• Our total impact score was 5 points.
• Our new total score for the solar oven is 1.
Monday, May 20, 13

19. Reflection
• Our improved design did not work well
because we changed our cloth with sand
which wasn't a good insulator. We could tell it
wasn't a good insulator because the
temperature dropped about 40°C when
heating.
• If we could improve again, we would use better
insulators like foam pipes because it would
keep the heat in.
Monday, May 20, 13