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# Changes

## Small Parabolic Cooker for Jefferson Community Center

, 00:40, 7 February 2018
==Abstract==[[File:Parabola.jpg|thumb|left|How a Parabolic cooker Works]]<center>''Short abstract describing the project from background to conclusion''</center>[[File:Jefferson_Community_Center.jpg|thumb|left|Jefferson Community Center]]
==Background==
==Problem statement==
The object of this project is to create a parabolic mirror cooker that is a successful example of the ways to capture and use the sun's energy in a sustainable manner. We plan to do this in two steps by first testing the most efficient and effective way of building the cooker, then implementing the most environmentally friendly construction techniques to achieve the creation of it.

==Project Evaluation Criteria==
== Literature Review ==
Introduce ===The Shape===Parabolas and Paraboloids are always something fun to learn about. They have a unique shape that gives them properties that are pretty interesting. They have the literature review briefly power to focus radio, light, and then even sound waves into one focal point using reflection. The unique shape of the curve gives the paraboloid this unique characteristic. In order to find the focal point for the paraboliod, one must use heading the equation y = p * x^2, where p is the constant, y is the depth of the paraboloid, and subheadings for topicsx is the max circumference of the paraboloid. With this equation, were were able to find our focal point which was about 4.5" inches above the center of our paraboloid. ===The History===Parabolic Solar cookers are devices designed to capture the suns direct heat using a parabolic shaped reflective surface. This should focus on information… NO PLAGIARISM! Make sure They work by reflecting the suns rays into one central focal point creating temperatures exceeding 500 F used to heat, cook, and pasteurize food or water. Parabolic Solar cookers date back many centuries to civilizations all around the world. From the Greeks, to the Aztecs, to see assignments on MoodleThe Ancient Chinese and Romans, they all had a version.<ref>For example there you will see And since the sun is the recommendation only source of fuel needed to create heat for use [[Help:Footnotes]], they are practical to create and inexpensive to operate and maintain, making them a perfect educational tool for sustainable cooking.</ref>
==Construction==
{{How to
|title=How to Construct a Papasan Chair Polished Aluminum Solar Cooker
|File:Bpack bike trailer - demo Parabolic measure.JPG | |1|Measure and trace facets on aluminum sheets |File:Beverly Shear.jpg |Backpack frame bike trailer |2 |Cut out all facets using the Beverly Shear. This process is time consuming as the shear only cuts several inches per slice. |File:Triangle.jpg ||3 |Drill attachment holes in top corners of all facets. These should be about 1 /4 inch in diameter to allow for zip-ties to easily slide through. Drill a half inch hole at the small end of the facet to allow for the anchoring bolt. |Do somethingFile:Parabolic facets1.jpg | |4 |Place facets on chair and insert anchoring bolt |File:Aleiha dishParabolic facets3.jpg |Aleiha's parabolic solar cooker |2 5 |Slowly fan out facets, being careful not to scratch aluminum. Note: pink protective plastic is left on until all facets are securely in place. |Do something really complicated that really isn'tFile:Zip ties.jpg ||6 |Insert zip-ties in each corner and attach to outer bamboo rim of Papasan chair frame|File:Sheet.jpg | |7 |Remove plastic and inspect for any blemishes |File:Assembled cooker2.jpg ||3 8 |Do something really complicated that really isn't that takes Assemble tripod. Bundle up lots of space the 3 bamboo poles and goes all place bike inner tubes around one end. Keep doubling the way across tubes over on themselves until tight. This will allow the pagepoles to expand into a tripod and easily retract down into bundle form. |File:Canopy.jpg ||9 |Suspend chain from top of tripod and attach white metal grate with mini carabiners.This grate will hold numerous different cooking surfaces.|File:Burning.jpg | |10 |Cook, boil, and burn!
}}

===Maintenance Instructions===
Description of We build our solar cooker with maintenance in mind, our motto was simple construction means simple maintenance. There are very few moving parts on this project making the maintenance a breeze. There main concern for maintenanceis proper storage and cleaning. Probably Prior to every use, the polished aluminium faucets must be polished. And without proper storage, the cooker could fall apart in a small table with tasks few years. The main components of the cooker are the zip ties, the chain, and the bamboo rods. All very inexpensive and easy to replace. We have an extra aluminum faucet as well in case of damage to one of the original faucets, and money/time each will takeextra zip ties to donate as well.
==Proposed Time Line==
|align="right"| 0.00
|-
| 1 4 || 52' Length of Stainless Steel Chain|| Ace Hardware |align="right"| 12.51\$/ft|align="right"| 21.74|-| 1 || Pot for cooking demonstration w/ Lid|| Thrift Store
|align="right"| 5.00
|-
| 1 || String For Construction|| Ace Hardware
|align="right"| 5.00
|align="right"| 5.00
|-
| 1 2 || Pot for cooking demonstration wBicycle Inner tube || Old bike tires in garage|align="right"| Found |align="right"| 0.00 |- | ~10 || Various connectors/ Lidzip-ties|| Thrift StoreAce Hardware |align="right"| 521.00 25|align="right"| 521.00 25
|-
| >10 1 || Various AccessoriesWhite metal grate || Assorted Thrift Store|align="right"| >500.0067 |align="right"| >500.00 67
|-
| 3 || Wooden Dowels Bamboo Poles 1" x 8' || Ace Hardware Mad River Garden Supply |align="right"| 202.00 69|align="right"| 608.00 68
|-
| 1 || Sheet of reflective Aluminum - 5' x 8'|| Local Scrapyard AluMet Metal Supply (ordered online)|align="right"| ~100111.00 04|align="right"| ~100111.00 04
|-class="sortbottom"
|colspan="4" align="right" | '''Total Cost'''
|align="right"| '''\$225168.0038'''
|}
===Testing results===
Describe the testing results.
Directly after construction of the cooker, several tests were administered to determine the effectiveness of the parabola.

'''Initial Test'''

The first test was simply placing a small bundle of paper in what we assumed was the focal point to see if it would ignite. It smoked and charred for approximately 30 seconds but never ignited. Next, we put 1 pint of water in a pot which was suspended form the bamboo tripod. After approximately 20 mins, some bubble were visible but no boiling was recorded.
'''Fine Tuning'''
To better aim the dish at the sun, we employed the "pencil shadow" technique. This entails screwing a pencil into the securing nut at the center of the cooker. With the pencil sticking up perpendicular to the dish, we placed a piece of paper with a hole in the middle around the nut so a shadow from the pencil was easily visible. This allowed us to adjust the cooker until no shadow was visible, meaning it was pointed directly at the sun.
'''Final Testing'''

Once the panels had been thoroughly cleaned and the dish aimed directly at the sun, we ran the same two test again. A soda can sized bundle of brown paper was placed in the focal point of the cooker and within 20 seconds it was on fire. This means that the temperature at the focal point was at least 451 degrees F. Second, we placed 1 pint of water in the same pot and found that it took 10-15 minutes to boil.
'''Future Testing'''

Further testing will include an infrared temperature gun to accurately measure the focal point temperature. Different cooking mediums, such as skillets, pans, and dutch ovens, will also be tried to determine which cooks food/water most efficiently.
===Discussion===
Discuss After final testing we can safely assume that the cooker is capable of producing temperatures well in excess of 450 degrees F. The focal point of the cooker is approximately the size of a softball, thus cooking with a small to medium pan or pot is most efficient. The most important part of the testing resultscooking surface is that the bottom be black. Lighter, reflective surfaces do not absorb as much heat, thus food will not cook nearly as efficiently. This project was very enjoyable to work on and we look forward to inspiring and educating others
===Lessons learned===
Discuss lessons were learned during this project * ALWAYS watch for stray rays of light, they can and what you would do different next timewill start a fire, the more concave the dish, the less the concern.* ALWAYS wear UV protective eye wear when working with sun light and reflective materials.* Try to find a pot with a black bottom, greatly increases cooking temp for pan. If not, Black Tempera paint applied to the bottom of the pan will help greatly* ALWAYS store with something covering it or upside down, stray sun can find them* Constant adjustment is necessary as the sun tracks across the sky* Wind can cause chain to sway and rob cooking surface of heat* Make sure parental supervision is given if in the presence of kids* Perfect conditions are hard to find* Works best when sun directly over head(full sun)
===Next steps===
Discuss any next steps for Developed mainly as an inspirational tool, the parabolic cooker will be used in demonstrations and educational events. '''Arcata Plaza''' To reach the widest audience possible, we plan to display the cooker during several of Arcata's Farmer's Market events on the Arcata plaza. These demonstrations will show the project cooker in action as it goes cooks food and boils water. Pamphlets or informational signage will be prepared to further the public's knowledge on into cooking with solar energy. Additionally, warning signs will be prepared to ensure onlookers are protected from the bright reflections that can escape the parabola.  '''Jefferson Community Center''' After several plaza demonstrations, the Jefferson Community Center in Eureka, California has agreed to permanently house the parabolic cooker. They plan to use the cooker in demos and for community events held at the center. The cooker will serve mainly as an inspirational tool for the center's youth, sparking an interest in sustainable and renewable energy in future environmental scientists.  '''Improved Designs''' During the building process we noted several areas for improvement in futureprojects. Instead of using the bamboo papasan chair as a frame, the aluminum facets could be connected using a small rope or cord. This cord would weave through the holes drilled at the top corners of each facet and when pulled tight would force the middles of the facets to bow out, creating a stand alone parabolic dish. This model has numerous implications, as it would be portable, lightweight, and smaller, making it perfect for travel.
==Team==
Introduce team and semester in the following format:
*[[User:Kevin_Burks|Kevin Burks]]
*[[User:Nah33|Nick Hurn]]

Grading criteria for the remaining sections:
*Grammar and spelling +10
*Formatting +10
*Depth, breadth and accuracy of content +70
*Project documentation's potential for impact (e.g. reproduction) +10
==References==*[[User:Kevin_Burks|Kevin Burks]]-Fourth Year Environmental Science Major with an Emphasis on Energy and Climate and a Minor in Geospatial Sciences at [[Humboldt State University]]{{Reflist}}*[[User:Nah33|Nick Hurn]]-Fourth Year Environmental Science Major with an Emphasis on Energy and Climate at [[Humboldt State University]]