Group A6Group A6Pedal-Powered Purifier Pedal-Powered Purifier

(PPP)(PPP)

Presented by:Presented by:

Eric SabelhausEric Sabelhaus

September 7, September 7, 20062006 Eric Sabelhaus Nicole Del Rey

Mike McConnellTim Rodts

Current Design GraphicCurrent Design Graphic

Est. Girth: 108” (2.7m)

Design StatusDesign Status Design Requirements:Design Requirements: IAW ASME design IAW ASME design

competition. competition. Target market:Target market: disaster relief victims, single user. disaster relief victims, single user. Show-stopper:Show-stopper: Power requirement to evaporate Power requirement to evaporate

200 mL H200 mL H22O (268 W) exceeds human power input O (268 W) exceeds human power input (150 W).(150 W).

Component Analysis:Component Analysis: Condensation experiment demonstrates that vapor Condensation experiment demonstrates that vapor

condenses on its own, no condenser necessary. condenses on its own, no condenser necessary. Pedal-power will provide primary work input.Pedal-power will provide primary work input. Generator needed to convert mechanical E→ electrical Generator needed to convert mechanical E→ electrical

E?E?

Action Items Action Items from from

Week 2 (08/29)Week 2 (08/29)

1) Find Wattage outputs for: rowing machine, stationary 1) Find Wattage outputs for: rowing machine, stationary bike, hand crank. SELECT best option. bike, hand crank. SELECT best option.

Result: Result:

(Watts)(Watts)

RowinRowingg

Stationary Stationary BikeBike

Hand Hand CrankCrank

NominNominalal 140140 150150 2525

PeakPeak 170170 225225 3030

Based on McConnell’s Rolfs workout, STATIONARY BIKE selected as source of human-derived power. May attempt to addhand crank if more power is desired.

2) Calculate energy required to evaporate 200 mL 2) Calculate energy required to evaporate 200 mL HH22O. O.

Result:Result:

P (inHg)P (inHg) TTboil boil (°F)(°F) Power Power Required(W)Required(W)

29.9 29.9 (atmospheric)(atmospheric) 212212 268268

2020 192192 266266

1010 158158 262262

• Pressure reduction appears ineffective in reducing power requirement.• Must find method of reducing power requirement below human work input.

3) Research viable options for reducing 3) Research viable options for reducing boiling temperature (adding chemicals, boiling temperature (adding chemicals, vacuum pump, etc.) ID most feasible vacuum pump, etc.) ID most feasible option. option.

Result: Result: • Dr. Lappin claims a pressure-reducing Dr. Lappin claims a pressure-reducing

VACUUM could potentially reduce VACUUM could potentially reduce boiling temperature to 50 – 60 °C. boiling temperature to 50 – 60 °C.

• Further analysis/experimentation of Further analysis/experimentation of water aspirators and insulation needed. water aspirators and insulation needed.

Action Items Action Items for for

Week 4 (09/12)Week 4 (09/12)

1) Research generator connections from 1) Research generator connections from rotating shaft and to heating coils. ID rotating shaft and to heating coils. ID three generator brands that could meet three generator brands that could meet design requirements.design requirements.

Approach: Approach: • Meet with Mr. BrownellMeet with Mr. Brownell• Research various company catalogs onlineResearch various company catalogs online

2) Reach decision on whether to 2) Reach decision on whether to include a pressure-reducing vacuum include a pressure-reducing vacuum in design. in design.

Approach: Approach:

Set up experiment in NSH using Set up experiment in NSH using water aspirator to test boiling water aspirator to test boiling temperatures at various pressures. temperatures at various pressures. (Thursday) (Thursday)

3) Select type of heating source (plate, 3) Select type of heating source (plate, coils, etc.)coils, etc.)

Approach:Approach:• Take apart and analyze available hot potTake apart and analyze available hot pot• Research market online for various Research market online for various

productsproducts• Possibly run experiment for different coil Possibly run experiment for different coil

configurations?configurations?

Questions?Questions?