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Small Parabolic Cooker for Jefferson Community Center

3,110 bytes added, 00:40, 7 February 2018
{{305inprogress|May 15, 2013}}[[File:RandomParabolicNick kevin cooker.gifJPG|thumb|leftright|500px|Some Examples of Parabolic CookersKevin and Nick with the Papasan solar cooker]] 
When we first took on this project, we had three different design opportunities to consider and we were overwhelmed to say the least. But luckily for us, we had help from [[Projects with Bart|Bart Orlando]], a local expert on solar cookers. The first design we considered was using a recycled radar dish as a frame, the second was a portable parabolic cooker with a collapsible frame, and the third was using a recycled papasan chair as a frame. We were looking at using a recycled chair or radar dish because of there inherent parabolic shape already. Once we decided that our most feasible design would be the Papasan Chair, we had to next decide what kind of reflective surface to cover the chair with. We had to choose between a Mylar coating, stainless steel faucets, or polished aluminum faucets. Our project criteria focuses on durability and efficiency, so we decided to use polished aluminum sheets because they are highly reflective yet durable enough to mend and not rip or tear. Once our .025" polished aluminum sheet came in we had to decide our faucet designs, the sliver like triangles that would cover the outside of the chair to reflect the sunlight to the focal point. We decided to make our faucets 8" on the thick end and a 2" truncated end on the other side where we can drill through and align all facets with a bolt. Once we completed the reflective chair aspect of the project, we started on the tripod/grill rack design. We thought about mounting a rack system directly onto the chair, but the constant adjustment for proper sun angle deterred us. Instead, we settled on a tripod system made out of three 1" thick bamboo rods held together with tightened recycled bicycle tubes at the top. From the top of the tripod, we hung a 1.5ft 2ft section of chain with three other 1.5ft 2ft sections of chain hanging off of that chain. Those three pieces of chain we connected to our grill racking making a flat, maneuverable cooking surface to put a assortment of pans on. With some adjustments and tests, we were able to calibrate our solar cooker to burn paper, boil water, and educate the community about the importance of sustainable cooking practices. [[File:Parabola.jpg|thumb|left|How a Parabolic cooker Works]][[File:Jefferson_Community_Center.jpg|thumb|left|Jefferson Community Center]]
{{How to
|title=How to Construct a Papasan Chair Polished Aluminum Solar Cooker
|File:Bpack bike trailer - demo 1Parabolic measure.jpg JPG |Backpack frame bike trailer |1 |Do something.Measure and trace facets on aluminum sheets |File:Aleiha dishBeverly Shear.jpg |Aleiha's parabolic solar cooker |2 |Do something really complicated that really isn'tCut 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 |Do something really complicated that really isn't that takes up lots Drill attachment holes in top corners of space 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. |File:Parabolic facets1.jpg | |4 |Place facets on chair and goes insert anchoring bolt |File:Parabolic facets3.jpg | |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. |File: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 | |8 |Assemble tripod. Bundle up the way across 3 bamboo poles and place bike inner tubes around one end. Keep doubling the pagetubes over on themselves until tight.This will allow the poles 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. Probably There are very few moving parts on this project making the maintenance a small table with tasks breeze. There main concern for maintenance is proper storage and cleaning. Prior to every use, the polished aluminium faucets must be polished. And without proper storage, the cooker could fall apart in a 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"| 521.0074
| 1 || String For Construction|| Ace Hardware
|align="right"| 5.00
|align="right"| 5.00
| 1 || Pot for cooking demonstration w/ Lid|| Thrift Store
|align="right"| 5.00
|align="right"| 5.00
| >10 2 || Various AccessoriesBicycle Inner tube || Assorted Old bike tires in garage|align="right"| >50.00Found |align="right"| >500.00
| ~10 || Various connectors/zip-ties|| Ace Hardware |align="right"| 21.25|align="right"| 21.25|- | 1 || White metal grate || Thrift Store|align="right"| 0.67 |align="right"| 0.67|- | 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
|colspan="4" align="right" | '''Total Cost'''
|align="right"| '''$225168.0038'''
Discuss the After final testing resultswe 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 cooking 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===
1. * ALWAYS watch for stray rays of light, they can and will start a fire, the more concave the dish, the less the concern.2. * ALWAYS wear UV protective eye wear when working with sun light and reflective materials.3. * 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 greatly4. * ALWAYS store with something covering it or upside down, stray sun can find them5. * Constant adjustment is necessaryas the sun tracks across the sky6. * Wind can cause chain to sway and rob cooking surface of heat* Make sure parental supervision is given if in the presence of kids7. * Perfect conditions are hard to find8. * Works best when sun directly over head(full sun)
===Next steps===
*[[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]]*[[User:Nah33|Nick Hurn]] ==References=={{Reflist}}-Fourth Year Environmental Science Major with an Emphasis on Energy and Climate at [[Humboldt State University]]
==See also==
* [[Projects with Bart]]
* [[Compound parabolic concentrators]]
* [[Compound parabolic reflectors for solar cookers]]
* [[Parabolic solar cookers]]
[[Category:Engr305 Appropriate Technology]]
[[Category:Jefferson Community Center]]
[[Category:Parabolic solar cookers]]

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