EPA Solar Oven Project #05301

Critical Design Review

May 13, 2005

5-13-05 05301 EPA Solar Oven 2

Team Solar Oven

Team Lead: Emma Fulton ISE

Team Members: Josh Bates ME

Otman El Allam ISE

Natasha Privorotskaya ME

Jon Steiner ME

5-13-05 05301 EPA Solar Oven 3

Agenda Introduction Needs Assessment Specifications/Requirements Feasibility Assessment Materials Selection Concept Development & Designs Testing Methodology Future Work Questions

5-13-05 05301 EPA Solar Oven 4

Project Mission Statement Design, test, and build a low-cost solar

oven for use in Latin American countries using locally available resources, mass production methods, and labor

Note: Objective is not to reinvent the wheel, rather to make it suitable for use in rural Latin America

5-13-05 05301 EPA Solar Oven 5

Needs Assessment: Scope Limitations Design should only incorporate locally available

resources, production methods, and labor Design should be mass-producible Design must be durable Design must be able to cook food and pasteurize

water Must perform user testing to ensure ease of use

5-13-05 05301 EPA Solar Oven 6

Needs Assessment: Scope Limitations (Cont’d) Design must be benchmarked against three

commercially available units Thermal analysis must be conducted on

prototypes With Graduate student assistance

Economic, social, environmental impact Lifecycle and durability analysis

5-13-05 05301 EPA Solar Oven 7

Pairwise Comparison of Attributes

5-13-05 05301 EPA Solar Oven 8

Ranking of AttributesOrder ATTRIBUTE

Points Awarded

1 Low cost 70

2 Reaches Temperature Quickly 10

3Able to Pausterize Water and Measure Completion of

Pasteurization10

4 Easy to use 2

5 Durable (Weather Resistant) 1

6 Capable of cooking large meals 1

7 Easy to clean 1

8 High packing density (stackable) 1

9 Light weight 1

10 Easy to Store/ Portable 1

11 Made of eco-friendly materials 1

5-13-05 05301 EPA Solar Oven 9

Order Winners: Top 3 Attributes Inexpensive design Heats up quickly Reaches temperatures necessary to cook

food and pasteurize water

5-13-05 05301 EPA Solar Oven 10

House of Quality

Link to file

5-13-05 05301 EPA Solar Oven 11

Materials Selection* Main Construction Material Reflector Material Cover Material

* CES Selector 4.5

5-13-05 05301 EPA Solar Oven 12

Main Construction Material

5-13-05 05301 EPA Solar Oven 13

Main Construction Material

5-13-05 05301 EPA Solar Oven 14

Wood Selection

Type of Wood

Price (USD/lb)

Density (lb/in3)

Thermal Expansion (µstrain/ºF)

Particle Board 0.291 0.0217 6.945

MDF 0.374 0.0271 6.945

Plywood 0.624 0.0271 3.889

5-13-05 05301 EPA Solar Oven 15

Reflector and Cover Material Offset printing plates chosen for reflector

Cost Use of recycled materials

Acrylic chosen for cover material Durability

5-13-05 05301 EPA Solar Oven 16

Three Main Types of Solar Ovens

Types Advantages DisadvantagesMost commonEasy to useEasy to buildRetains heat longerEasy to build Not sturdy during windy weatherCheapest to build Easy to damageHeats up very quickly Requires direct sunlightSturdy Dangerous to use

Inconvenient (frequent adjustment)

Longer to heat up food

Parabolic

Panel

Box

Box Panel Parabolic

5-13-05 05301 EPA Solar Oven 17

Concept Development

Homemade ~$10

Commercial: $120-$220

5-13-05 05301 EPA Solar Oven 18

Generation I: Four Reflector Box

$33.64 (Materials)

5-13-05 05301 EPA Solar Oven 19

Generation I: Single Reflector Box

$15.38 (Materials)

5-13-05 05301 EPA Solar Oven 20

Generation I: Pyramid Reflector Box

$19.65 (Materials)

5-13-05 05301 EPA Solar Oven 21

Testing Methodology Determine angle of reflectors

Square One software Laser Testing

Mimic sun’s energy Create indoor setup Calibrated solar cell

Test prototypes outside Thermocouples

5-13-05 05301 EPA Solar Oven 22

Generation I Performance

5-13-05 05301 EPA Solar Oven 23

Generation II-A Trip to Venezuela

Fabricate 2 units Single paned Double paned

Test outdoors Performance

Reached water pasteurization temperatures 65C (149F)

5-13-05 05301 EPA Solar Oven 24

Expert Input Dr. Nandwani of Costa Rica Materials and Designs

Use glass not acrylic Best insulation materials Optimal thicknesses

Generation II-B

5-13-05 05301 EPA Solar Oven 25

Generation II-B Performance

5-13-05 05301 EPA Solar Oven 26

Generation III Thermal analysis

Optimal insulation thickness

Increased capacity for larger families

Cost: $32.33 Materials Labor

5-13-05 05301 EPA Solar Oven 27

Generation III Performance

5-13-05 05301 EPA Solar Oven 28

HOQ Compare ours to the comm units

5-13-05 05301 EPA Solar Oven 29

Benefits of Solar OvensIf 1000 solar ovens are used throughout the

year by families of 6 peoples…

FIREWOOD 16800 Tons/Year CO2 6324 Tons/Year CO 318 Tons/Year FUEL 4,080,000 KG

5-13-05 05301 EPA Solar Oven 30

Thanks and Questions Thanks to:

Dr. Carrano Dr. Thorn Dr. Raffaelle Carlos Plaz Mr. Wellin Dr. Mozrall Chris Wood

Questions?