A6: Team RallyeA6: Team RallyePotable Water StillPotable Water Still

Presented by:Presented by:

Entire GroupEntire Group

September 28, September 28, 20062006 Eric Sabelhaus Nicole Del Rey

Mike McConnellTim Rodts

Design StatusDesign Status Power Power Bike Pedals Bike Pedals

Generator Generator Magnet DC Motor Magnet DC Motor

Heat Source Heat Source Polymer ( ? ) encased Polymer ( ? ) encased wirewire

Condensation Condensation Cooling coils onlyCooling coils only

On time and moving with individual trade On time and moving with individual trade studies. studies.

Semester OutlookSemester Outlook

Assignments Prototype Other

19-Sep Trade study proposals submitted Website createdConcept memo submitted

26-Sep Preliminary cost estimation Determine intelligence functionsOrder nichrome wire

3-Oct Order generatorOrder polymerOrder sensorsOrder structural material

10-Oct Trade studies completed Order air pumpOrder pressure valvesProgram microcontroller

17-Oct24-Oct Manufacture polymer Initial CAD Assembly developed

Test heat sourceTest air pump

31-Oct Build structureTest pressure valves

7-Nov Assemble electronics, sensors, valves14-Nov Install components

Test fully operating prototype16-Nov Draft design doc. completed21-Nov Prototype demonstration28-Nov Concept design review5-Dec Design documentation due

Current Cost AnalysisCurrent Cost Analysis ChainsChains

ChairChair GearsGears

GeneratorGenerator PolymerPolymer

Temperature Temperature SensorSensor

BatteryBattery TubingTubing

Vacuum pumpVacuum pump Pressure valvesPressure valves Bottom surfaceBottom surface

AdhesiveAdhesive

$3$3

$149 + ship$149 + ship

$20$20

$5$5

$200$200

$20$20

$10$10

TOTAL $407

Action Items Action Items fromfrom

Week 5 (09/19)Week 5 (09/19)

-1--1-

Finalized Trade Study Proposals – Finalized Trade Study Proposals – Thermal and geometric optimization of Thermal and geometric optimization of

polymerpolymer Gearing for generator inputGearing for generator input Condensing mechanismCondensing mechanism Pressure reducing apparatusPressure reducing apparatus

-2--2-

Condensing MechanismCondensing Mechanism The decision was made that on our The decision was made that on our

limited budget the available materials limited budget the available materials would not support condensing with would not support condensing with rapid pressure change.rapid pressure change.

Condensing using cooling coils is Condensing using cooling coils is considered in one of the trade studiesconsidered in one of the trade studies

-3--3-

Develop contacts with polymer Develop contacts with polymer suppliersupplier Polymer suppliers have been contactedPolymer suppliers have been contacted

not so cool.not so cool.

Only sell to production line industry. Large Only sell to production line industry. Large Volume.Volume.

Suggested difficulty with locating high Suggested difficulty with locating high temperature polymer bar stock.temperature polymer bar stock.

Action Items Action Items for for

Week 7 (10/03)Week 7 (10/03)

-1--1-

CAD assembly of key componentsCAD assembly of key components Graphical aide to determine most Graphical aide to determine most

compact orientation of components compact orientation of components underneath chairunderneath chair

Approach:Approach:• Measure dimensions of known partsMeasure dimensions of known parts• Use worst-case dimensions for not yet ordered partsUse worst-case dimensions for not yet ordered parts• Parts: Gears (2), Chair, Pedals, Stationary & Removable Parts: Gears (2), Chair, Pedals, Stationary & Removable

base, heating element, condensing tube, collection base, heating element, condensing tube, collection containercontainer

-2--2-

Detailed cost analysis: all Detailed cost analysis: all foreseeable purchasesforeseeable purchases Wood for base, pins, connections, seals, Wood for base, pins, connections, seals,

etc.etc.

Approach:Approach:• Dimension bases (wood)Dimension bases (wood)• Thorough analysis of design component connectionsThorough analysis of design component connections• Trade study resultsTrade study results

-3--3-

Continue trade study analysisContinue trade study analysis Generator selection, embedded coils, Generator selection, embedded coils,

condensation tubes, pressure reductioncondensation tubes, pressure reduction

Approach:Approach:• Stay on task with individual schedulesStay on task with individual schedules• Report progress back to group, offer feedbackReport progress back to group, offer feedback

Show-stoppersShow-stoppers

Cost of partsCost of parts $150 generator$150 generator $200+ air pump$200+ air pump

Locate suppliersLocate suppliers Generator/Gear interfaceGenerator/Gear interface Heat source.Heat source.

Questions?Questions?