By Allie Hillerman

Designing a Solar Oven

Monday, May 20, 13

Imagine for Design #1• Idea #1

• Our materials are newspaper, sand and rocks.

• We need 1 unit of sand and rocks and 2 units of newspaper.

• The advantage of this idea is that both has the least environmental impact and is a great insulator.

• The disadvantage of this idea is that the newspaper isn't the best insulator of heat.

Monday, May 20, 13

Imagine for design #1• Idea #2

• Our materials are cotton balls and cloth.

• We need 1 unit of cloth and 2 units of cotton balls.

• The advantage of this is idea is that both cotton and cloth make good insulators of heat.

• The disadvantage of this idea is that cloth is in the middle of the most and the least of environmental impact.

Monday, May 20, 13

Design #1

Top view

Monday, May 20, 13

Design #1Side view

Monday, May 20, 13

Plan for design #1

Material Units We will use the material by

Newspaper 2 Fold it

Rocks and Sand 1 Leave it how it is

Monday, May 20, 13

Impact Score for design #1

Design #1 Reduced

Natural or

processed

Reuse Recycle Total points

Newspaper 2 units Processe

d Yes 3 3

Rocks and sand 1 unit Natural No 0 0

Our total impact score is 3 points.

Monday, May 20, 13

Time Temperature (Celsius)

0 min

5 min

10 min

15 min

20 min

25.0

43.5

46.3

54.1

57.4

25 min 60.4

Solar oven testing in the sun Design #1

Monday, May 20, 13

Solar oven testing in the shadeDesign #1

Time Temperature (Celsius)

1 min 50.0

2 min 42.7

3 min 38.1

4 min 36.2

5 min 35.5

6 min 34.4

Monday, May 20, 13

Create for design #1• Our heat score is our solar oven maximum

temperature subtracted from the control oven. 60-55=5

• Our time score is the number of minutes it took to cool down which was 5 minutes.

• Our total impact score was 3 points.

• Our total score for the solar oven is 7.

Monday, May 20, 13

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 the rocks and sand because they gave off the most heat.

• The part of our solar oven design that did not work well was the newspaper because the newspaper only put shade in the box.

• We are going to try to improve our heat score.

• We will improve our heat score by putting the oven I'm more direct sunlight or put black cloth inside the oven instead of newspaper to attract/absorb more sunlight.

Monday, May 20, 13

Top viewPlan for design #2

Monday, May 20, 13

Side viewPlan for design #2

Monday, May 20, 13

Plan for design #2Material Units How will you use

the material?

Cloth

Sand and rocks

2 Cut it into strips

1 Leave it how it is

Monday, May 20, 13

Our impact score is 5 points

Design #2 Reduced

Natural or processe

dReuse Recycle Total

points

Cloth 2 units Processed Yes No 3

Sand and rocks 1 unit Natural No Yes 0

Design #2Monday, May 20, 13

Solar oven testing in the sunDesign #2

Time Temperature (Celsius)

0 min 24.4

5 min 42.5

10 min 49.7

15 min 42.1

20 min 44.8

25 min 45.3

30 min 45.5

Monday, May 20, 13

Solar oven testing in the shadeDesign #2

Time Temperature (Celsius)

1 min 37.8

2 min 35.4

3 min 33.7

4 min 32.8

5 min 31.6

6 min 30.9

7 min 29.7

8 min 28.9

9 min 28.6

10 min 28.3

Monday, May 20, 13

Create for design #2• Our heat score is our solar oven maximum

temperature subtracted from the control oven: 50-53= negative 3.

• Our time score is the number of minutes it took to cool down which was 3 minutes.

• Our total impact score was 3 points.

• Our new total score for the solar oven is negative 3 points.

Monday, May 20, 13

Reflection• Our improved design did not work well because the

materials we changed were poor at insulating heat. The materials were bad insulators because we got a total score of negative 3. We took out the newspaper and replaced it with cloth. Because our temperature decreased, we knew cloth was a bad insulator.

• If we could improve again, we would change the materials. Like instead of sand and rocks, we would use foam because it could insulate the heat better so the heat will increase. We know that foam is a good insulator because it is thick.

Monday, May 20, 13