Group A6 Pedal-Powered Purifier (PPP) Presented by: Eric Sabelhaus September 7, 2006 Eric Sabelhaus Nicole Del Rey Mike McConnellTim Rodts

Current Design Graphic Est. Girth: 108” (2.7m)

Design Status Design Requirements: IAW ASME design competition. Design Requirements: IAW ASME design competition. Target market: disaster relief victims, single user. Target market: disaster relief victims, single user. Show-stopper: Power requirement to evaporate 200 mL H 2 O (268 W) exceeds human power input (150 W). Show-stopper: Power requirement to evaporate 200 mL H 2 O (268 W) exceeds human power input (150 W). Component Analysis: Component Analysis: Condensation experiment demonstrates that vapor condenses on its own, no condenser necessary. Condensation experiment demonstrates that vapor 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 E? Generator needed to convert mechanical E→ electrical E?

Action Items from Week 2 (08/29)

1) Find Wattage outputs for: rowing machine, stationary bike, hand crank. SELECT best option. Result: (Watts) (Watts)Rowing Stationary Bike Hand Crank Nominal Peak Based on McConnell’s Rolfs workout, STATIONARY BIKE selected as source of human-derived power. May attempt to add hand crank if more power is desired.

2) Calculate energy required to evaporate 200 mL H 2 O. Result: P (inHg) T boil (°F) Power Required(W) 29.9 (atmospheric) 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 boiling temperature (adding chemicals, vacuum pump, etc.) ID most feasible option. Result: Dr. Lappin claims a pressure-reducing VACUUM could potentially reduce boiling temperature to 50 – 60 °C. Dr. Lappin claims a pressure-reducing VACUUM could potentially reduce boiling temperature to 50 – 60 °C. Further analysis/experimentation of water aspirators and insulation needed. Further analysis/experimentation of water aspirators and insulation needed.

Action Items for Week 4 (09/12)

1) Research generator connections from rotating shaft and to heating coils. ID three generator brands that could meet design requirements. Approach: Meet with Mr. Brownell Meet with Mr. Brownell Research various company catalogs online Research various company catalogs online

2) Reach decision on whether to include a pressure-reducing vacuum in design. Approach: Set up experiment in NSH using water aspirator to test boiling temperatures at various pressures. (Thursday)

3) Select type of heating source (plate, coils, etc.) Approach: Take apart and analyze available hot pot Take apart and analyze available hot pot Research market online for various products Research market online for various products Possibly run experiment for different coil configurations? Possibly run experiment for different coil configurations?

Questions?