EPA Solar Oven Project #05301 Critical Design Review May 13, 2005

EPA Solar Oven 2 Team Solar Oven Team Lead:Emma FultonISE Team Members:Josh BatesME Otman El AllamISE Natasha PrivorotskayaME Jon SteinerME

EPA Solar Oven 3 Agenda Introduction Needs Assessment Specifications/Requirements Feasibility Assessment Materials Selection Concept Development & Designs Testing Methodology Future Work Questions

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

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

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

EPA Solar Oven 7 Pairwise Comparison of Attributes

EPA Solar Oven 8 Ranking of Attributes OrderATTRIBUTE Points Awarded 1Low cost 70 2Reaches Temperature Quickly 10 3 Able to Pausterize Water and Measure Completion of Pasteurization 10 4Easy to use 2 5Durable (Weather Resistant) 1 6Capable of cooking large meals 1 7Easy to clean 1 8High packing density (stackable) 1 9Light weight 1 10Easy to Store/ Portable 1 11Made of eco-friendly materials 1

EPA Solar Oven 9 Order Winners: Top 3 Attributes Inexpensive design Heats up quickly Reaches temperatures necessary to cook food and pasteurize water

EPA Solar Oven 10 House of Quality Link to file

EPA Solar Oven 11 Materials Selection* Main Construction Material Reflector Material Cover Material * CES Selector 4.5

EPA Solar Oven 12 Main Construction Material

EPA Solar Oven 13 Main Construction Material

EPA Solar Oven 14 Wood Selection Type of Wood Price (USD/lb) Density (lb/in 3 ) Thermal Expansion (µstrain/ºF) Particle Board MDF Plywood

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

EPA Solar Oven 16 Three Main Types of Solar Ovens BoxPanelParabolic

EPA Solar Oven 17 Concept Development Homemade ~$10 Commercial: $120-$220

EPA Solar Oven 18 Generation I: Four Reflector Box $33.64 (Materials)

EPA Solar Oven 19 Generation I: Single Reflector Box $15.38 (Materials)

EPA Solar Oven 20 Generation I: Pyramid Reflector Box $19.65 (Materials)

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

EPA Solar Oven 22 Generation I Performance

EPA Solar Oven 23 Generation II-A Trip to Venezuela Fabricate 2 units Single paned Double paned Test outdoors Performance Reached water pasteurization temperatures 65  C (149  F)

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

EPA Solar Oven 25 Generation II-B Performance

EPA Solar Oven 26 Generation III Thermal analysis Optimal insulation thickness Increased capacity for larger families Cost: $32.33 Materials Labor

EPA Solar Oven 27 Generation III Performance

EPA Solar Oven 28 HOQ Compare ours to the comm units

EPA Solar Oven 29 Benefits of Solar Ovens If 1000 solar ovens are used throughout the year by families of 6 peoples… FIREWOOD Tons/Year CO Tons/Year CO 318 Tons/Year FUEL 4,080,000 KG

EPA Solar Oven 30 Thanks and Questions Thanks to: Dr. Carrano Dr. Thorn Dr. Raffaelle Carlos Plaz Mr. Wellin Dr. Mozrall Chris Wood Questions?