Designing a solar ovenBy Y!en

Monday, May 20, 13

Imagine for Design #1

Idea #1

Our material is white styrofoam

We need 3 units

The advantage of this idea is when we put the white styrofoam on the sides we could cover up the holes.

The disadvantage of this idea is that we could get a higher impact score.

Monday, May 20, 13

Imagine for Design #1

Idea #2

Our materials are felt flat and foam flat.

We need 2 units for flat felt and 1 unit for foam flat

The advantage of this idea is that the felt could hold more heat and the foam could cover up the holes that let the heat out

The disadvantage of this idea is the felt and foam would get a higher impact score.

Monday, May 20, 13

Plan for design #1Top view

The white foam was

cut so it can cover

up any holes the box may have

Monday, May 20, 13

Plan for design #1Side view

Monday, May 20, 13

Plan for design #1

Material UnitsWe will use the material

by.

Foam 1 units Flat

Felt 2 units Flat

Monday, May 20, 13

Impact score for design #1

Design #1

Reduce Natural

or processed

reuse RecycleTotal

points

Felt 2 units Processed No No 5

Foam 1 unit Processed No Yes 4

Our total impact score is 9 points

Monday, May 20, 13

Solar Oven Testing in the Sun

Time Temperature

0 minutes 25°C

5 minutes 32.6°C

10 minutes 36.3°C

15 minutes 38.1°C

20 minutes 39.9°C

25 minutes 40.2°C

Monday, May 20, 13

Solar Oven in the Shade Time Temperature

1 minute 39.9°C

2 minute 39.3°C

3 minute 38°C

4 minute 37.3°C

5 minute 36.2°C

6 minute 35.1°C

Monday, May 20, 13

Create for Design #1

Our heat score is our solar oven max Temperature subtracted from the control oven:40-55=-15

Our time score is the number of minutes it took to cool down which was 6 minutes.

Our total impact score was 9 points.

Our total score for the solar -18°C

Monday, May 20, 13

Improve for design #1The total score for our first solar oven was -18°C points

The parts of our solar oven design that worked well was the aluminum foil because it reflected the light well into the solar oven

The parts of our solar oven that did not work well was the plastic insulator because it did not trap the heat inside the solar oven

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

We will improve our heat score by using new materials because they could possibly trap the heat inside the solar oven.

Monday, May 20, 13

Plan for design #2

This is the top view of

our design #2 solar oven.

Monday, May 20, 13

Plan for design #2

These are our new

materials we are going to use for our

solar oven on design#2

Monday, May 20, 13

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

material

Red felt 1 unit Fold it

Aluminum 1 unit Fold it

Black foam 1 unit Fold it

Monday, May 20, 13

Impact score for design #1

Materials ReduceNatural

or Processed

Reuse Recycle

Red felt 1 unitProcesse

d No No

Aluminum

1 unitprocesse

dNo No

Black foam

1 unitProcesse

dNo No

Total points

4

4

4

Monday, May 20, 13

Solar oven testing in sunTime Temperature

0 min 16°C

5 min 30.5°C

10 min 32.5°C

15 min 37.4°C

20 min 37.7°C

25 min 40.7°C

30 min 43.4°C

Monday, May 20, 13

Solar oven testing in shade

Time Temperature 1 min 30.7°C2 min 27.7°C3 min 25.7°C4 min 23.2°C5 min 19.2°C6 min 18.9°C7 min 18.9°C8 min 18.9°C9 min 18.8°C10 min 18.8°C

Monday, May 20, 13

Create for Design #2

Our heat score is our solar oven maximum temperature subtracted from the control oven: 43-41=2

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

Our total impact score was 12 points

Our new total score for the solar oven is -5

Monday, May 20, 13

Reflection Our improved design did not work well because the materials we used let out the heat very fast. The materials that we changed were poor insulators like felt and aluminum because they did not trap the heat inside the solar oven very long because when we moved it in the shade the solar oven let out the heat and the temperature dropped. The aluminum was probably not a good insulator because it is made of metal and is a conductor.

If we could improve again,we would take out the aluminum foil and replace it with black foam because the aluminum foil does not trap the heat but instead it reflects it and the black foam traps the heat in.

Monday, May 20, 13