Designing a solar oven

By Trenton Przybylski

Monday, May 20, 13

Imagine for design #1• Idea number one

• Our materials are shredded felt, flat foam.

• We need one unit of shredded felt, and two units of flat felt.

• The advantage of this idea is both materials are good insulators and will cover the inside of the solar oven.

• The disadvantages of this idea is the foam has a bigger impact to the environment.

Monday, May 20, 13

Imagine for design #1

• Idea two

• Our materials are shredded felt, flat foam.

• We need two units of shredded felt, and one unit of flat foam.

• The advantages of this idea is shredded materials are better insulators, so there is more shredded than flat.

• The disadvantages of this idea is we might not have enough foam for the sides of the oven.

Monday, May 20, 13

Top view

Monday, May 20, 13

Side view

Monday, May 20, 13

Plan for design number one

Material Units We will use the material by.

Shredded felt

Flat foam

1 unitTo cover the bottom of the solar oven.

2 unitsTo cover the sides of the solar oven.

Monday, May 20, 13

Impact score for design number one.

Design#1 Reduce Natural or

processed Reuse Recycle Total points

Shredded felt

Flat foam

Units 1 Processed No No 7

Units 2 Processed No No 4

Our first impact score was eleven.Monday, May 20, 13

Solar oven testing in the sun

Time Temperature

0 minutes 25°C

5 minutes 47°C

10 minutes 55.8°C

15 minutes 60°C

20 minutes 61.6°C

25 minutes 58°CMonday, May 20, 13

Solar oven in the shadeTime Temperature

1 minute 40°C

2 minutes 38°C

3 minutes 37.4°C

4 minutes 32.5°C

5 minutes 31.1°C

6 minutes 30.9°CMonday, May 20, 13

Create for design Number one

• Our heat score is our solar ovens maximum temperature subtracted from the control oven:62°C-55°C=7°C.

• Our time score is the number of minutes it took to cool down which was 4 minutes.

• Our impact score was eleven points so that tells me I need to improve our score because our first two materials was processed.

Monday, May 20, 13

Improve for design number one

• Our score for the first solar oven as 0 points.

• The parts of our solar oven design that worked well were the shredded felt because the shredded materials are better insulators.

• We are going to improve the impact score because our impact score is high and we want to bring it down so we are going to improve it choosing the items that are natural and not the items that are processed.

Monday, May 20, 13

Plan for design #2• Top view

Monday, May 20, 13

Plan for design #2Side view

Monday, May 20, 13

Plan for design number two

Material Units How will you

use the material.

Sand

Rocks

News paper

1 unitSpreading across the

bottom

1 unit Placing over the sand

1 unit Cutting it for the sides

Monday, May 20, 13

Impact score for design twoDesign

#2 Reduce Natural or processed Recycle Reuse Total

points

Rocks

Sand

News paper

1 unit Natural Yes Yes -2

1 unit Natural Yes Yes 0

1 unit Processed Yes Yes -2

Our total points were a -4Monday, May 20, 13

Solar oven testing in the sun

Time Temperature

0 minutes

5 minutes

10 minutes

15 minutes

20 minutes

25 minutes

24.4°C

49.5°C

51.5°C

43.9°C

54°C

48.4°C

Monday, May 20, 13

Solar oven testing in the shade

Time Temperature

1 minute

2 minutes

3 minutes

4 minutes

5 minutes

6 minutes

32°C

31.7°C

31.1°C

30.9°C

31.9°C

30.5°CMonday, May 20, 13

Create for design number two

• Our heat score is our solar ovens maximum temperature subtracted from the control oven: 54 - 53 = 1.

• Our time score is the number of minutes it took to cool down which was 7 minutes.

• Our total impact score was -4 points.

• Our new total score for the solar oven is 12.

Monday, May 20, 13

Reflection• Our improved design worked well because the first materials we

had made us get a really low score which was zero and this time our score was 12 which was an improvement. The materials we changed were foam, and felt because they had an bigger impact on the environment. The sand, rocks and newspaper were good insulators because they made our temperature increase and had a low impact on the environment.

• If we could improve again we would have three materials because that would make our score a lot higher and make our impact score lower. My group is a lot happier because we would have a higher score than everybody who used newspaper.

Monday, May 20, 13