Alternative Power Source for Dental Hygiene Device Nizar Almansouri Ningbiao Jiang Francisco Heath Jin Niu Jiaqi Xie Concept Generation and Selection

Contents of Presentation 1 1. Problem Statement 2. Design Summaries 3. Criteria Comparisons 4. Gantt Chart 5. Conclusion 6. References

Problem Statement NAU Department of Dental Hygiene  Humanitarian work in remote areas  No electricity available to power Wig-L-Bug 2

Possible Solutions  Solar + Battery  Manual Charger + Battery  Battery Only 3

Solar + Battery  Flexible Solar Panel, 2 square meters  Battery and Inverter connected in Parallel  Calculations based on average insolation in December 4

Component Size(in)Weight(lb)Cost($)Quantity Total Cost($) Solar Charger 8.5× V Inverter Modified Sinewave 5×2.25× Cable Total14.5×8.5× Detail of Solar Battery Method

Manual Generator + Battery 6 × A Bicycle style crank will turn an alternator with a belt or chain drive Off-the-shelf bicycle parts will ensure good efficiency and reliability 100 watts of input at the pedals is a sustainable level for average college student

Manual Generator + Battery Details 7 PartCost($)Weight (lb) Alternator758 Battery1001 Inverter501 Frame758 Gears, Cranks, Pulleys, etc 1505 Wiring, electronics, etc501 TOTAL50024

Battery Only 8 Battery Cell Details Cell Voltage3.7 V Capacity120 Watt hours Charge Current1.8 Amps Discharge Current1.2 Amps Weight5 lbs

Battery Only 9 PartsQuantityPrice ($)Subtotal ($) Battery Charger130 Inverter120 Frame120 Total310

Raw Comparison 10 SolarGeneratorBattery Uninterrupted Power (% Down Time)2000 Cost ($) Weight (lb)1225 Life Span (hours) Size (Within 56 x 45 x 25 cm)yes Peak Output (watts)

Normalized Data 9 SolarGeneratorBattery Uninterrupted Power (% Down Time)010 Cost ($)05.57 Weight (kg)1055 Life Span (hours)5510

Weighted Comparison 10 Uninterrupted Power Cost Weight Lifespan Raw Total Normalized Total Uninterupted Power Cost Weight Lifespan Certain Criteria, like size and peak output, either meet constraints or they don’t. Others, like weight and cost, should be as low as possible

Weighted Criteria 11 SolarGeneratorBattery Uninterrupted Power (% Down Time)04.25 Cost ($) Weight (kg) Life Span (hours) Total (Higher is Better)

Gantt Charts 12

Summary 13 Problem Statement Design Concepts Comparison Design Selection Gantt Chart

References     14