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Lecture 6 – Solar Oven Kickoff

Engineering 102 . Lecture 6 – Solar Oven Kickoff. Administration. Midterm is almost graded – will hand back on Tuesday Energy Unit items have been graded except for Bloom box discussion posts Complete registration for Open Houses by 2/18, tomorrow iExpo is next week!

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Lecture 6 – Solar Oven Kickoff

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  1. Engineering 102 Lecture 6 – Solar Oven Kickoff

  2. Administration • Midterm is almost graded – will hand back on Tuesday • Energy Unit items have been graded except for Bloom box discussion posts • Complete registration for Open Houses by 2/18, tomorrow • iExpo is next week! • Tuesday, February 22, 201110:00 am to 3:00 pmStudent Union, 3rd Floor Ballroom

  3. Administration • iExpo: Engineering Industry Career Fair • Have your resume with you • Business casual dress is appropriate • Go early for best swag selection

  4. Administration • Business Formal Attire • More appropriate for actual interviews

  5. Administration Personal expression is important, but realize that you are making a first impression that cannot be undone

  6. Administration Team Names! Team 1: Team Gila + Nick Team 2: Team Force Team 3: Engineering Excellence Team 4: TEAM BJANKL (bah-jane-kle) Team 5: * Team 6: * Team 7: Beast Mode Team 8: * * Team HW: Please email me with your team name!

  7. Today’s Agenda • Team Gila + Nick: Video presentation • Kick off the Solar Oven project • Discuss first Solar Oven HW (team HW)

  8. Solar Power in Arizona Take it away, Team Gila + Nick!

  9. Solar Oven Project • Solar Fact: the earth receives more energy in one hour than it uses in an entire year! • One of the Grand Challenges • Team Project with multiple steps • 3 basic types of Solar Cookers: • Box • Panel • Parabolic

  10. Solar Oven Project • Box Solar Cooker: • Box cookers cook at moderate to high temperatures and often accommodate multiple pots. Worldwide, they are the most widespread.

  11. Solar Oven Project • Panel Solar Cooker: • Panel cookers are simple and relatively inexpensive to buy or produce. Solar Cookers International's "CooKit" is the most widely used.

  12. Solar Oven Project • Parabolic Solar Cooker: • Curved concentrator cookers or "parabolics" • Cook fast at high temperatures, but • Require frequent adjustment and supervision for safe operation.

  13. Solar Oven Project • Our ENGR 102 Box Solar Cooker: An enclosed cardboard box with aluminum foil reflectors

  14. Solar Oven Project • Solar oven video Segments: • Solar cooking in impoverished countries: • http://www.youtube.com/watch?v=Ofn7jqPDTeY • A simple Pizza Box Solar Oven: • http://www.youtube.com/watch?v=b6mOT-hgqfQ

  15. Oven Construction Reflectors Window Make top of oven flat… NOT SLOPED Cooking tray Insulated Enclosure

  16. Energy • All cooking energy comes from sunlight • Concentrated by reflectors • Absorbed by dark interior surfaces • Radiation retained by window • Heat retained by insulation Make top of oven flat… NOT SLOPED

  17. The Basic Oven A double-wall insulated cardboard box with aluminum foil reflectors and a plastic window Reflector Window Inner box Insulation Outer box Make top of oven flat… NOT SLOPED

  18. First Construction Spec 1 reflector, 3 sizes 15 x 15 cm chamber with 8 cm front height Window 15 x 15 cm with 1 or 2 Mylar layers Outer box size limited by cardboard supply Loose or tight newspaper Angle set for test day Make top of oven flat… NOT SLOPED

  19. Oven Dimensions M L W Make top of oven flat… NOT SLOPED

  20. Solar Angles Solar Radiation Window Θs y β Make top of oven flat… NOT SLOPED

  21. Window Construction Power Density = IO Solar Radiation Window Transmittance =  Power Density = 2 IO

  22. Solar Oven Project: What we gain • Experience in: • Developing a performance prediction model • Converting data into design decisions • Analyzing design variables • Designing and building a device (twice!) • Testing a finished product (twice!) • Practice in: • Sustained teamwork • Maintaining engineering records • Appreciation for alternative sources of energy

  23. Solar Oven Project: The Basic Steps

  24. Solar Oven Project: Schedule • Oven construction and test schedule: • (dates subject to slight adjustment) • 2/17 (today!): Project starts • 2/28 – 3/4: pick up materials (Room 200) • 3/8: Test first oven design • 3/10: Dissect another team’s oven • 3/22 & 3/24: Team oral/ PowerPoint presentations • 8 minutes/team maximum • 5 - 8 slides • 4/1 (Friday): Test redesigned ovens – “SOTD!” • 4/7: Solar Oven written project report due

  25. Solar Oven Project: Deliverables • Interim homework items: • Solar Oven Comparisons (Team HW) – due 3/1 • Solar Oven Prediction Model (Team HW) – due 3/3 • Solar Oven for first test – 3/8 • Solar Oven for dissection – 3/10 • Team Oral Presentations - 3/22 & 3/24 • Second round Solar Oven for Throwdown – 4/1

  26. Solar Oven Project: Deliverables, cont. • Final written project report (Team), including • Design Spreadsheet • Oven schematic • Descriptions of the process • Evaluation of results • Discussion of theory • Working notes • References and Appendices • Final Report due on 4/7

  27. First Round Tasks • Read through Solar Oven document • Work through Solar Oven comparisons HW • Develop a prediction model for your optimally-designed oven • Build an oven according to your calculated specifications • Test your oven for maximum temperature • Compare to predicted maximum temperature

  28. First Round Tasks, cont. • Pass your oven to a designated team • Analyze the oven you receive from another team • Details of construction • Measurements and calculations

  29. Final Notes • Solar Oven Topics to be continued on Tuesday • For Tuesday, read Solar Oven document pp. 1-11, 28-29, and pp. 34-37 • Ignore reference to Design of Experiments (DOE) • Solar Oven Comparisons HW (team) within Solar Oven document, pp 28 – 29; due 3/1 • Designate team member to pick up your oven supplies the week of 2/28 • Teams without names: please email me with your name

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