DESIGNING A SOLAR OVENBY: EMMA ROBERTS

Monday, May 20, 13

Imagine For Design #1

• Idea #1

• Our materials are foam, sand and cotton balls

• We need one unit of each.

• The advantage of this idea is that foam and cotton are good insulators. Sand and cotton have a low impact score.

• The disadvantage of this idea is foam has a high environmental impact and it is not recyclable. Cotton is also not recyclable.

Monday, May 20, 13

Imagine For Design #1

• Idea #2.

• Our materials are foam, cotton balls and white cloth.

• We need one unit of each material.

• The advantages of this idea are cotton and cloth have low impact scores are good insulators and can be reused.

• The disadvantages of this idea are that foam has a high impact score. Cotton and cloth and foam can not be recycled.

Monday, May 20, 13

Top View

Plan #1

Monday, May 20, 13

Side view

Monday, May 20, 13

Plan for design #1

Material Units How will you use it

Foam 1 We will put it on the bottom.

Cloth 1 We will put it on the sides.

Cotton balls 1 We will put it on the top.

Monday, May 20, 13

Impact Score For Design #1Design

#1Reduce Reuse Recycle Natural/

Processed# of

points

Cotton Balls

Foam

White Cloth

1 unit No No Processed 4

1 unit Yes No Processed 1

1 unit Yes No Processed 2

Our total impact score is____ points.Our total impact score is____ points.Our total impact score is____ points.Our total impact score is____ points.7

Monday, May 20, 13

Solar oven testing in the sun.

Time Temperature

0 min. 25°c

5 min. 37.9°c

10 min. 41.3°c

15 min. 56.6°c

20 min. 59.4°c

25 min. 60.3°c

Monday, May 20, 13

Solar oven in the shade.Time Temperature

1 min. 42.7°c

2 min. 35.8°c

3 min. 32.1°c

4 min. 31.2°c

5 min. 32.1°c

6 min. 31.1°c

7 min. 30.7°c

Monday, May 20, 13

Create for design #1

• Our heat score is our solar oven maximum temperature subtracted from the control oven: 60c - 55c =5

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

• Our total impact score was 7 points

Total score5+2-7 =

Score

5

2

7

0

Monday, May 20, 13

Improve for design #1

• The total score for our first solar oven design was 0.

• The parts of our solar oven that worked well were the insulators because they allowed the temp. to increase to 60°c.

• The time score didn't work out well because the oven took a short time to cool down.

• We will improve our time score by making sure to cover all the holes where heat may escape in the box.

Monday, May 20, 13

Cloth

Plan For Design #2

Monday, May 20, 13

Plan for design #2 (side view)

Monday, May 20, 13

Plan for design #2

Material Units How will we use the material

White Foam 1 Cut into pieces(On the sides)

Cotton Balls 1 Leave normal(On the top)

Sand 1 Leave normal(On the bottom)

Monday, May 20, 13

Impact score for design #2

Design #2 Reduce Reuse Recycle Natural/

processedTotal points

White Foam

Sand

Cotton balls

1 pointNo

(+ 1)Yes(- 1)

Processed(+ 1) 2 points

1 pointYes(- 1)

Yes (- 1)

Natural(- 1) 0 points

1 point No(+ 1)

No(+ 1)

Processed(+ 1) 4 points

Our total impact score was 6 points.Monday, May 20, 13

Solar oven testing in the sun

Time Temperature

0 min. 16°c

5 min. 25.9°c

10 min. 27.8°c

15 min. 28.9°c

20 min. 29.2°c

25 min. 30.1°c

30 min. 30.9°c

Monday, May 20, 13

Solar oven testing in the shadeTime Temperature1 min. 27.9°c2 min. 25.7°c3 min. 24.0°c4 min. 22.7°c5 min. 21.5°c6 min 20.6°c7 min. 20.1°c8 min. 19.5°c9 min. 19.0°c10 mi. 18.5°c

Monday, May 20, 13

Create for design #2

• Our heat score is our solar oven maximum temperature subtracted from the control oven: 31-41 = -10.

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

• Our total impact score was 6 points.

• Our new total score for the solar oven was -11.

Monday, May 20, 13

Reflection• Our improved design did not work as well as the first one. I think

it did not work as well because we didn't have as good insulators. Although we thought that sand would reflect the sunlight and heat up the box, we didn't have enough time for the sand to heat up. Also what didn't work well was the white foam, since it was shredded, it didn't cover the whole side of the box allowing heat to escape. The cotton balls were the only good insulators in our box, they filled up the whole space on the top of the box with no gaps that could let heat through.

• If we could improve our design again we would use flat foam on the sides because we think that the majority of the heat escapes out the sides. We would also continue using the cotton balls as we have every design because a single unit can cover a whole side of the box. We wouldn't shred anything because if we did there wouldn't be enough of the material to cover the designated space.

Monday, May 20, 13

THANKS FOR WATCHING! :)Designing a solar oven

By: Emma Roberts

Brought to you by:Have a Nice Day Inc.

Monday, May 20, 13