human powered

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