Designing a solar oven

By: Lesly Alvarado

Monday, May 20, 13

Imagine for design #1

Idea # 1

Our materials are white cloth, felt, and foam

We need 1 unit of each material.

The advantage of this idea is that they are all good insulators.

The disadvantage of this idea is that the white clothe won't absorb the heat it will bounce it.

Monday, May 20, 13

Imagine for design # 1

Idea # 2

Our materials are foam, and white cloth

We need 1 unit of foam and 2 units of whit cloth.

The advantage if this idea is that the foam will keep the heat in.

The disadvantage of this idea is that the white cloth will not absorb the heat.

Monday, May 20, 13

Plan for design # 1

Top view

Monday, May 20, 13

Plan for design # 1

Side view inside

Monday, May 20, 13

Plan for design # 1

Material Units We will use the material by

White cloth

White foam

Felt

1 Shredded under the foam

1 Not shredded under the pot

1Shredded all

around the inside sides

Monday, May 20, 13

Impact score for design # 1 Design

# 1 ReduceNatural

or process

esd

Reuse Recycle Total Points

Material

White cloth

Material

White foam

Material

Felt

1 unit Processed Yes No + 2

1 unit Processed No Yes + 2

1 unit Processed No No + 4

Our total impact score is + 8 points.Monday, May 20, 13

Solar oven testing in the sun Time Temperature

0 minutes 25 c

5 minutes 53.5 c

10 minutes 59 c

15 minutes 68.8 c

20 minutes 68.7 c

25 minutes 71.4 c

Monday, May 20, 13

Solar oven in the shade Time Temperature

1 minute 53.3 c

2 minutes 41.9 c

3 minutes 35.8 c

4 minutes 33.5 c

5 minutes 31.5 c

6 minutes 30.3 c

Monday, May 20, 13

Create for design # 1

Our heat score is our solar oven maximum temperature subtracted from the control oven: 71 c - 55 c = 16

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

Our total impact score was + 8 points.

Our total score for the solar oven is 11.

Monday, May 20, 13

Improve for design # 1

The total score for our first solar oven was 11 points.

The parts of our solar oven design that workers well were the insulation because it kept a lot of heat in.

The parts of our solar oven design that did not work well was the white cloth because it didn't keep that much heat in.

We are going to try to improve our heat score and our impact score.

We will improve our heat score by using dark color cloth instead of the white one because dark colors absorb the heat.

Monday, May 20, 13

Plan for design # 2

Top view

Monday, May 20, 13

Plan for design # 2

Side view

Monday, May 20, 13

Plan for design # 2 Material Units

How will you use this

material?

Dark color cloth 1 unit Shredded under the foam

Foam 1 unit Not shredded and under the

pot

Felt 1 unit Shredded on 3

sides on the inside

Monday, May 20, 13

Impact Score for Design #2Design

# 2 ReduceNatural

or processe

d

Reuse Recycle Total points

MaterialDark color cloth

MaterialFoam

MaterialFelt

1 unit Processed Yes No + 2

1 unit Processed No Yes + 2

I unit Processed No No + 4

Our total impact score is + 8 points.Monday, May 20, 13

Solar oven testing in sun Time Temperature

0 minutes 28.7 °c

5 minutes 59.0 °c

10 minutes 63.7 °c

15 minutes 58.4 °c

20 minutes 59.9 °c

25 minutes 57.5 °c

30 minutes 53.5 °c

Monday, May 20, 13

Solar oven testing in shadeTime Temperature

1 minute 32.8 °c

2 minutes 30.9 °c

3 minutes 32.7 °c

4 minutes 32.0 °c

5 minutes 31.3 °c

6 minutes 31.0 °c

7 minutes 30.7 °c

8 minutes 30.1 °c

9 minutes 29.9 °c

Monday, May 20, 13

Create for design #2

Our heat score is our solar oven maximum temperature subtracted from the control oven: 64-56= 8

Our time score is the number of minutes it took to cool down which was 2 minutes.

Our total impact score was 8 points.

Our new total score for the solar oven is 2

Monday, May 20, 13

Reflection

Our improved design did not work well because it did not keep most of the heat in. The materials we changed was only the cloth. The material was good because it absorb the heat but it was a poor insulator because it didn't keep most of the heat in. We know this because when the solar oven was in the shade the temperature went down really fast.

If we could improve again, we would put back the white cloth because in our first design our total score was 11.

Monday, May 20, 13