Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.
Upcoming SlideShare
×

# Parabolic Solar Cookers

3,744 views

Published on

A presentation on parabolic solar collectors to K-12 educators. This was followed up with hands on activities and curriculum development.

Published in: Technology, Business
• Full Name
Comment goes here.

Are you sure you want to Yes No
Your message goes here
• See http://www.appropedia.org/Parabolic_solar_cookers for more.

Are you sure you want to  Yes  No
Your message goes here
• Alright... Download it for the cool animations. :)

Are you sure you want to  Yes  No
Your message goes here
• Unfortunately slideshare does not show all the animations.

Are you sure you want to  Yes  No
Your message goes here

### Parabolic Solar Cookers

1. 1. Parabolic Solar Cookers • Lonny Grafman • Most Images from Appropedia • Outline – Background – Basics – Design Examples – More Examples – Math and Physics Resources – Discussion
2. 2. 1000 watts/m2
3. 3. Solar Box Cooker aka Solar Oven
4. 4. Solar Parabolic Cooker
5. 5. The Parabola
6. 6. y=ax2 y f=1/(4a) f x
7. 7. The Parabola - Definition http://www.cut-the-knot.org/ctk/Parabola.shtml#Theorem1
8. 8. The Parabola - Reflection http://www.cut-the-knot.org/ctk/Parabola.shtml#Theorem1
9. 9. The Parabola Paraboloid
10. 10. Design Criteria: Design Objective: •Use of local materials •Efficiency To create a solar cooker •Durability from local invasive species •Ease of use and waste materials that •Ease of construction can pasteurize water and •Cost be a cooking alternative to •Impact on environment the use of fossil fuels. •Impact on lifestyle
11. 11. Results: •Equation: y =.5x2 •Time to boil quart: ~2 hrs Deformation Lessons Learned: •more blackberry runners •more rigid material for rings Reflectivity Lessons Learned: •pampas grass too lumpy •no dull, small can lids
12. 12. Protection from Dazzles and Burns • Appropriate focal point size • Glasses and gloves • Deep dish focus • Physical barrier • Physical separation • Appropriate system size
13. 13. Define the Problem Test and Gather Implement Information the Engineering Solution Design Process Analyze Generate and Select Alternative a Solution Solutions