EPA Solar Oven Project #05301

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

2. Team Solar Oven 05301 EPA Solar Oven

3. Agenda • Introduction • Needs Assessment • Specifications/Requirements • Feasibility Assessment • Materials Selection • Concept Development & Designs • Testing Methodology • Future Work • Questions 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 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 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 05301 EPA Solar Oven

7. Pairwise Comparison of Attributes 05301 EPA Solar Oven

8. Ranking of Attributes 05301 EPA Solar Oven

9. Order Winners: Top 3 Attributes • Inexpensive design • Heats up quickly • Reaches temperatures necessary to cook food and pasteurize water 05301 EPA Solar Oven

10. House of Quality Link to file 05301 EPA Solar Oven

11. Materials Selection* • Main Construction Material • Reflector Material • Cover Material * CES Selector 4.5 05301 EPA Solar Oven

12. Main Construction Material 05301 EPA Solar Oven

13. Main Construction Material 05301 EPA Solar Oven

14. Wood Selection 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 05301 EPA Solar Oven

16. Three Main Types of Solar Ovens Box Panel Parabolic 05301 EPA Solar Oven

17. Concept Development Homemade ~$10 Commercial: $120-$220 05301 EPA Solar Oven

18. $33.64 (Materials) Generation I: Four Reflector Box 05301 EPA Solar Oven

19. $15.38 (Materials) Generation I: Single Reflector Box 05301 EPA Solar Oven

20. $19.65 (Materials) Generation I: Pyramid Reflector Box 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 05301 EPA Solar Oven

22. Generation I Performance 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 65C (149F) 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 05301 EPA Solar Oven

25. Generation II-B Performance 05301 EPA Solar Oven

26. Generation III • Thermal analysis • Optimal insulation thickness • Increased capacity for larger families • Cost: $32.33 • Materials • Labor 05301 EPA Solar Oven

27. Generation III Performance 05301 EPA Solar Oven

28. HOQ • Compare ours to the comm units 05301 EPA Solar Oven

29. Benefits of Solar Ovens If 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 05301 EPA Solar Oven

30. Thanks to: Dr. Carrano Dr. Thorn Dr. Raffaelle Carlos Plaz Mr. Wellin Dr. Mozrall Chris Wood Questions? Thanks and Questions 05301 EPA Solar Oven