bicycle powered water pumpdesigned.mit.edu/gallery/data/2005/mockup/slides/purpleb.pdf · 2014. 7....
TRANSCRIPT
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Bicycle Powered Water Pump
Purple B Margaret Gentile Chris Grossman Charles Louison
Jim Otten Jessica Rabl Chris Rivest
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Overview
l Irrigation critically lacking in third world countries.
l Current pumps do not meet economic and ergonomic requirements of farmers.
l Bicycles are prevalent and relatively ergonomic mode of transportation.
l Bicycle powered pump answers irrigation need.
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Potential Markets l India
l People: 58% of population in agricultural labor force l Equipment: ~100M bicycles l Demand: need for irrigation water predicted to rise dramatically l Potential Concern: not socially acceptable for women to ride bicycles
l China l People: 50% of population in agricultural labor force l Equipment: ~750M bicycles l Demand: only 40% of cultivated land is irrigated, yet produces 67%
of crops (www.worldbank.org)
l Many government sponsored irrigation projects fail due to poor efficiencies and lack of system maintenance
l Summary- $1 billion market for $50 pump (2.5% market penetration)
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MoneyMaker Pump Benchmark
l max pumping rate = 1.5L/sec l total pumping head = 13m l max useable well depth = 6m l max distance pumping across flat
land = 200m l max amount of land irrigated =
2.4acres l pump weight = 20kg l manufacture cost = $200 l consumer cost = $50
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Critical Issues Benchmarking l Cost
l Goal: To be most cost effective human powered pump in third world market
l Bellows design makes piston a disposable commodity item
l Ergonomics l Goal – To provide a more comfortable pumping
system than MoneyMaker pump l Proven that cycling lower impact than running
l Efficiency l Goal – To design a pump of equal or better
efficiency than MoneyMaker pump
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Issues Addressed by Mockup l Feasibility of low cost goal
l pump built for less than $25 l Critical bellows component costs on order of pennies l Still need to reduce cost of other components (valve etc.)
l Pump Design l Various designs considered, bellows chosen on cost basis l Bellows pump found to work best when two are run in
parallel l Efficiency
l Design for taking power off rear wheel – still needs testing l Pump – still need to address valve and sealant issues
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Mockup Design
l standard bicycle fits into universal stand
l power taken off rear wheel with roller
l roller transmits power via chain to crank shaft
l crank shaft powers positive displacement bellows pump
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Pump Testing
Charles River Chapel Moat
Difficulty achieving pump head, priming pump may improve
performance
Better flow rate, high inertial forces due to discontinuous
pumping action
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Test Results (Manual) l Single bellows hand
pumping rate = .75L/sec l Inertia matters! l Double out of phase
bellows reduced force by ~6x
l Priming necessary l Cheap pump feasible
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Mock Up Demo
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Future Work/Lessons Learned
l Install double pump technology/dual reservior to reduce inertial forces
l Reduce compliance in power transmission l Implement drive reduction l Extract quantitative data from mockup -
measure efficiency l Pumps are fun!