Paula

Designing a solar ovenBy: Paula Valencia

Monday, May 20, 13

Imagine for design #1Idea #1

Our materials are shredded foam on the bottom, shredded felt on two sides, shredded cotton on the other two sides.

We need one unit from every material.

The advantage of this idea is that most of our materials are very good insulators, and they have little impact, therefore giving us a low environmental impact score.

The disadvantage of this idea is that our foam has a big environmental impact, giving us a high impact score.

Monday, May 20, 13

Imagine for design #1Idea#2

Our materials are shredded cloth on two sides, shredded felt on the bottom, and shredded white foam on the other two sides.

We need one unit from each of the material.

The advantage of this idea is that these materials are good insulators and they have little environmental impact

The disadvantage of this idea is that we would have preferred to have three different materials than these but the ones that we wanted had too much environmental impact so we chose these instead.

Monday, May 20, 13

Plan for design #1Top view

Monday, May 20, 13

Plan for design #1Side view

Monday, May 20, 13

Plan for design #1

Materials Units We will use the material by

Shredded cloth One unit Putting it on two of the sides of the box.

Shredded felt One unit We will put the felt on the bottom.

Shredded white foam One unit On the other two

sides of the box.

Monday, May 20, 13

Impact score for design #1Design #1 Reduce Natural or

processed Reuse Recycle

Shredded cloth

Shredded felt

Shredded white foam

1 unit Processed Yes No

1 unit Processed No No

1 unit Processed No Yes

Total points

2 points

4 points

2 points

Total impact score 8 points

Monday, May 20, 13

Solar oven testing in the sun

Time Temperature

0 minutes 25° C

5 minutes 38.9°C

10 minutes 47.7°C

15 minutes 50°C

20 minutes 54.3°C

25 minutes 65.5°C

Monday, May 20, 13

Solar oven in the shade Time Temperature

1 minute 63.8°C

2 minutes 50° C

3 minutes 40.5°C

4 minutes 33.6°C

5 minutes 31.4°C

Monday, May 20, 13

Create for design #1

Our heat score is our solar oven maximum temperature subtracted from the control oven: 66°C–55°C = 11°C.

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

Our total impact score was 8 points.

Our total score for the solar oven is 7 points.

Monday, May 20, 13

Improve for design #1The total score for our first solar oven was 7 points.

The parts of our solar oven design that worked well were our insulators because they trapped in the heat very well.

The parts of our solar oven that did not work well was the plastic covering because it would always fall off the hole.

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

We will improve our heat and impact score by using different insulators that don't have a lot of impact. Can also use darker materials because they trap in heat better.

Monday, May 20, 13

Plan for design #2Top view

Monday, May 20, 13

Plan for design #2Side view

Monday, May 20, 13

Plan for design #2Material Units How will you use the

material?

Cloth

Newspaper

Cotton

1 unit = 1 sheet Shredded

1 units = 1 sheets Crumpled

1 unit = 1 scoop Pull/ shred

Monday, May 20, 13

Impact score for design #2 Design #2 Reduce Natural or

processed Reuse Recycle Total points

Cloth

Newspaper

Cotton balls

1 unit Processed Yes No 2 points

1 unit Processed Yes Yes 0 points

1 unit Processed No No 4 points

Total impact score 6 pointsTotal impact score 6 pointsTotal impact score 6 pointsTotal impact score 6 pointsTotal impact score 6 points

Monday, May 20, 13

Solar oven testing in the sun

Time Temperature

0 minutes 16°C

5 minutes 37.4°C

10 minutes 40°C

15 minutes 42°C

20 minutes 40.8°C

25 minutes 44.5°C

Monday, May 20, 13

Solar oven testing in shadeTime Temperature

1 minutes 33°C2 minutes 27.9°C3 minutes 23.9°C4 minutes 21.6°C5 minutes 20.1°C6 minutes 19°C7 minutes 18.3°C8 minutes 17.6°C9 minutes 17.1°C

10 minutes 16.9°C

Monday, May 20, 13

Create for design #2

Our heat score is our solar oven maximum temperature subtracted from the control oven: 45°C - 41°C = 4°C.

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

Our total impact score was 6.

Our new total score for the solar oven is 2 points.

Monday, May 20, 13

ReflectionOur improved design did not work well because our score was low and we do not want a low score. The materials we changed were using newspaper and cotton instead of felt and foam as insulators. We changed our insulators hoping to get a lower impact score on the environment. The materials were poor insulators because in our first design our solar oven temperature went up in the 60's but in our second design the temperature only went up to the 40's.

If we could improve again we would find even better insulators than the ones on the first design because then we might go up above the 60's and we would get a higher total score.

Monday, May 20, 13