DESIGNING A SOLAR OVEN By Preston Cornelius

Monday, May 20, 13

IMAGINE FOR DESIGN #1

• Idea #1:My group thinks that we should use river rocks to cover the bottom of the oven so that it holds the heat that hits the bottom, when I step on some by the lake they sometimes get super hot, we thought foam should go on the walls because foam is one of the best things on our list if objects to use to insulate.

• We want one cup of river rocks and two units (two sheets, like paper) of foam. The good thing about this idea is that river rocks are completely natural and don't hurt the environment, and the foam is reusable. The disadvantages are that the foam takes a long time to decompose and when we through it in a landfill it will stay there a while.

Monday, May 20, 13

IMAGINE FOR DESIGN #1

• Idea #2: For this idea we think we should use felt to cover the walls and try to contain most of the heat, and Shredded Foam to cover the ground because it is one of the best insulators.

• We want 2 units of felt, and 1 unit of foam. The good thing Is the felt is renewable and foam is too. But the bad part is that they both cannot be recycled, and they both have a lot of ink inside them, which can harm the environment.

Monday, May 20, 13

PLAN FOR DESIGN #1

Monday, May 20, 13

PLAN FOR DESIGN #1

Monday, May 20, 13

PLAN FOR DESIGN #1

Material Units We will use the material by

Foam 1 Spreading it across the bottom

Felt 2 Covering the sides with it

Monday, May 20, 13

IMPACT SCORE FOR DESIGN #1 Design

#1 Reduce Natural orProcessed Reuse Recycle Score

Felt2 units

Foam1unit

2 units= 4 points

Processed1point

No1point

No1point 7

1 unit=1 point

Processed1point

No1point

No1point 4

Total score 11

Monday, May 20, 13

SOLAR OVEN TESTING IN THE SUN

Time Temperature

0 min.

5 min.

10 min.

15 min.

20 min.

25 min.

0°c

25°c

46.2°c

66.2°c

65.6°c

71.1°cMonday, May 20, 13

SOLAR OVEN TESTING IN THE SHADE

Time Temperature

1 min.

2 min.

3 min.

4 min.

5 min.

6 min.

54.2°c

44.1°c

36.9°c

32.9°c

31.6°c

30.0°cMonday, May 20, 13

CREATE FOR DESIGN #1

• Our heat score is our solar ovens maximum temperature subtracted from the control ovens maximum temperature: 72-55=17

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

• Our total impact score was 11 points.

• Our total score for the solar oven is 10

Monday, May 20, 13

IMPROVE DESIGN #1

• The total score for our first solar oven is 10 points.

• The part of our solar oven that worked well was the foam that was inside. This probably worked well because it was the best heat insulator in our oven.

• The part of our solar oven that did not work well was the felt. I think that because we put thin layers on the walls and it could not contain all of the heat that came in.

• We are going to try to improve our heat score. Other solar ovens were getting a lot higher heat scores than us.

• We think that the only way to make our heat score go up is to use two units of Shredded foam and one shredded unit of felt. This well help because we know that shredded things take up more space, leading to they absorb more heat.

Monday, May 20, 13

PLAN FOR DESIGN #2

Monday, May 20, 13

PLAN FOR DESIGN #2

Monday, May 20, 13

PLAN FOR DESIGN #2

Material Units How we will use it

Foam 2 unitsTo cover the

ground and be the main insulator

Felt 1unitTo hold any thing the foam can't any

where else

Monday, May 20, 13

IMPACT SCORE FOR DESIGN #2 Design

#2 ReduceNatural

or Processed

Reuse Recycle Total points

Foam

Felt

2 units, 4 points

Processed +1 point

Has not been used

before+1 point

Can not recycle

+1 point7 points

1 unit, 1 point

Processed+1 point

Has not been used

before+1 point

Can not recycle

+1 point4 points

We want a low score, our score is 11.

Monday, May 20, 13

SOLAR OVEN TESTING IN THE SUNTime Temperature

0 min.

5 min.

10 min.

15 min.

20 min.

25 min.

30 min.

16°c

54.3°c

54.3°c

54.1°c

54.5°c

54.6°c

54.8°c

Monday, May 20, 13

SOLAR OVEN TESTING IN THE SHADETime Temperature1 min.2 min.3 min.4 min.5 min.6 min.7 min.8 min.9 min.10 min.

54.2°c54°c

54.2°c54°c

53.9°c54°c

54.2°c54.9°c54.4°c54.8°c

Monday, May 20, 13

CREATE FOR DESIGN #2• Our heat score is our solar ovens maximum temperature subtracted from the control oven: 55-41=14

• Our time score is the number of minutes it took to cool down which was 10 minutes.

• Our total impact score was 11 points.

• To find the total score I add the heat score and the time score together, and then do subtraction with that and the total impact score. The total score is 13.

Monday, May 20, 13

REFLECTION• The design we came up with to improve actually improved the oven. It

might have happened because we shredded everything in the box. We also decreased the amount of felt and increased the amount of foam. The foam must be the thing that helps hold and keep the heat inside the box.

• If we wanted to improve how our oven holds heat in, I would ONLY use shredded foam because shredded things take up more space and more insulation, and foam seems to be the best insulator. But that would affect our score of how it affects the environment. It would give us a higher environment score because you can not recycle foam, reuse it, it has been produced in a factory and is not natural, and I would be using 3 units of it.

Monday, May 20, 13