Alpha Prototype Presentation Nov 4, 2008. Today’s Presentation: System Schematic Review Materials...
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Transcript of Alpha Prototype Presentation Nov 4, 2008. Today’s Presentation: System Schematic Review Materials...
![Page 1: Alpha Prototype Presentation Nov 4, 2008. Today’s Presentation: System Schematic Review Materials Analysis Materials Processing Tube Fabrication Joints.](https://reader034.fdocuments.us/reader034/viewer/2022050714/56649e4f5503460f94b465e7/html5/thumbnails/1.jpg)
Alpha Prototype PresentationNov 4, 2008
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Today’s Presentation:• System Schematic Review• Materials Analysis• Materials Processing • Tube Fabrication• Joints and Filter Designs• Tank Specifications• Alpha Prototype• Cost Analysis• Project Concerns/Plans for Beta Prototype
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Schematic of Drip Pipe Irrigation System
1 m
(not to scale)
6 m
20 cm spacing between plants
Large Particle Filter
Water Tank
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Materials Analysis• HDPE cheap & environmentally friendly.• HDPE bags widely available in Ethiopia.• HDPE bags Too light to be fed into grinding
machine.
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Material Processing
• Two ways of making pellets out of plastic bags:
1. Heat (320 F) + Pressure (1000 Pounds) 20 bags to get thick solid sheets; Cut the sheet into smaller rectangular pieces to fed into grinding machine
Carver Press
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2. Roll 6 plastic bags in a cylindrical shape and feed.
Shredded Plastic bags Grinding Machine
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Tube Fabrication
• 75% LDPE pellets + 25% HDPE shredded bags by weight.
• Used Blown Film Processor
Blown Film Processor
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Blown Film Processing
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Fabrication Steps
1. Pour in the pellets into hopper
2. Blown film coming out from the circular die
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Fabrication Steps (Continued)
3. The HDPE tube growing in length
4. Pulling at a constant rate to make long tubes
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Initial SolidWorks Models:
Elbow Joint Y Joint
Prototype made with simpler joint designs made of HDPE
Initial Joints Designs
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Alpha Prototype Joint Design
• Solid HDPE tubes with holes drilled in them.• Tube is affixed onto opening:– Superglue (bad seal)– Soldering iron (decent watertight seal)– Shrink wrap? (possible future consideration)
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Filter Design
Alpha Prototype does not include the designed filter
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Tank Specifications
• Original Plan: A 110 Liter Tank (3 water refills/day)– Sorghum Plants in 6m X 6m Plot– 230 Sorghum requires a maximum of 3-4 Inch of water/10
days (during its highest growth phase)– At the flow rate of 51 L/hour the plants needs to be
irrigated for 6.25 hours per day• The plot will require 320 L/day of water
• Prototype Tank: 2.5 Liter water jug (Smaller scale)
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Alpha Prototype
• Tubes are inserted into the T and elbow joints.• Superglue, soldering iron is used in the
attachment of some tubes to ensure stability.• Smaller scale Drip Irrigation System• 2.5 Liter Water Tank
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Cost Analysis• Total Cost = $ 2.69 per system• Materials Cost
– $0.85 for injection molded water tap– $0.80 for 48 feet of tubing (including 5% rejection rate)– $0.70 for joints, elbows
• Utilities Cost– $0.03 per system based on current costs of electricity
• Other Costs (Rent, Machinery, Delivery) – Not included– Rent = $14 per system– Sunk
• $77 per system after 1 years• $15 per system after 5 years• Problems include high costs of machinery
• Labor Costs – would have to be $0 to make this reasonable without much funding
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Project Concerns
• Leaking of water from the joints• Some tube/ joints attachments less stable (use
of superglue)• Not 100% recyclable material• Tubes not straight (tend to curve)• Tube diameter not even throughout
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Plans for Beta Prototype
• Better T and elbow joints• Better/more stable attachments of tubes to
the joints• Tube of uniform diameter • Greater number of tubes (a larger drip
irrigation system)• Fabrication of filter for grey water
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Working Prototype is
Outside
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Any Questions?
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Initial Output Valve Design
3-D Printing currently presenting problems with assessing design.
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2nd Generation Output Valve Design
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Filter Material
•36in X 100 ft Charcoal Aluminum Screen for $82.00 a roll •Required filter area
would be 32 in2
•Allows for 1,375 filters at 6 cents a piece.
www.homedepot.com
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Pressure Flow Calculations
efunda.com
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3rd Generation Output Valve
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3D Print of 2nd Generation Design