human powered
DESCRIPTION
Modular System. Human Powered. Providing Basic Needs for Developing Countries. Dustin Drake, Alfonso Liguori , Jeremy Smith Florida Atlantic University Department of Ocean and Mechanical Engineering. Human Powered Modular System. Purpose: - PowerPoint PPT PresentationTRANSCRIPT
Human Powered
Dustin Drake, Alfonso Liguori, Jeremy Smith
Florida Atlantic UniversityDepartment of Ocean and Mechanical Engineering
Modular SystemProviding Basic Needs for Developing Countries
Human Powered Modular SystemPurpose:
Create a device capable of providing basic needs to people in developing nations at a relatively low cost
Focus:Water purification is most important featureAdditional modules for switching functionsLow cost
Human Power Supply
Human Power SupplyFor long duration / low intensity operations
Human input = 0.1 hp Very sustainable for a healthy person Short duration / low intensity operations will not
overly tire the operator
For Short duration / high intensity operations Human input = 0.2 hp Sustainable for durations less than 3 hours Will leave the operator very tired after extended
operation
Human Input MechanismGoals:
Simple, natural motion Efficient transfer of mechanical energy
Design Criteria: Portable Rigid Construction Multiple gear ratios
ModulesWater Filtration
Electricity Generator
Irrigation Pump
Grist Mill
Reverse OsmosisTwo liquids of different concentrations
separated by semi-permeable membraneLess saturated naturally flows into more
saturatedPressure is applied to reverse this
process and is known as reverseosmosis or RO
Dirty water flows throughmembrane thereby filtering it
dirty water clean water
Reverse OsmosisPurifies water
Highly efficientRelatively low cost4 stages of filtration
Sediment filter Activated carbon filter RO membrane Activated carbon filter
Numerical AnalysisPower requirement:
P = Q*p(P: Power, Q: volumetric flow rate, p: pressure)
p = 100 psiQ = 19 gal/hr
P = 0.019 HP
UV PurificationDisables reproduction of microorganismsRO system filters outMost effective at 253.7 nm wavelength
Different microorganisms require different intensitiesAverage approx. 30 mJ/cm2
Power required depends on exposure time affected by:Size of bulb and pipeFlow rate of water
Electrical Generation ModuleGoals:
Charge various types of batteries up to 12V Provide a source of low current DC electricity for
high efficiency light sources (LED based)
Design Criteria: Human input = 0.2 hp Expected efficiency = 30% Expected output = 4 Amps (for 12V)
Irrigation ModuleGoals:
Obtain unfiltered water Irrigate a small field
Design Criteria: Flow Rate, Q = 5 GPM Well Depth = 100 ft Human Input = 0.18 hp Reliable Long pump life Simple to maintain
Grist Mill ModuleGoals:
Grind grain
Design: Must accept various types of grain Must be able to provide different levels of grind
fineness: Fine grinds for flower Coarse grinds for cornmeal
Conclusion Uses:
Developing nationsEmergency disaster response (e.g. FEMA)Camping/backpacking
Expected final cost:Approx. $500 for base system w/ water purification
moduleRoughly couple hundred dollars per additional
module