1. A6: Team Rallye Potable Water Still Presented by: Eric Sabelhaus October 12, 2006 Eric SabelhausNicole Del Rey Mike McConnellTim Rodts

2. Design Status Power Power  Pedals  Gears  Generator Heat Source Heat Source  Ceramic bowl embedded with nichrome wire Polluted water container Polluted water container  Beaker surrounded by sand or PVC? Intelligence Intelligence  Temperature SensorWebsite Website

3. Design Status ‘Inspired’ by ASME guidelines ‘Inspired’ by ASME guidelines Currently ahead of schedule as far as starting to build prototype Currently ahead of schedule as far as starting to build prototype Cannot program microcontroller without temperature sensor Cannot program microcontroller without temperature sensor SHOWSTOPPER: SHOWSTOPPER: Generator/Output shaft connection Generator/Output shaft connection Talk to Brownell to address this issue Talk to Brownell to address this issue

4. Semester Outlook ! In the works

5. Action Items from Week 7 (10/03)

6. -1- Select and order temperature sensor and generator. Temperature Sensor from D allas Temperature Sensor from D allas Semiconductor:Voltage: 2.7 - 5.5 V (microcontrollers can provide 5 V) Semiconductor:Voltage: 2.7 - 5.5 V (microcontrollers can provide 5 V) Digital output (no A/D conversion) Digital output (no A/D conversion) Total cost for 3 sensors approx $10 Total cost for 3 sensors approx $10 Generator from windstreampower.com Generator from windstreampower.com 3A, 48V → 144 W 3A, 48V → 144 W 1.5 kg 1.5 kg $120 + shipping (after 20% group discount) $120 + shipping (after 20% group discount)

7. -2- Select removable and stationary base material Chose MDF (medium-density fiberboard) Chose MDF (medium-density fiberboard) Less expensive than wood Less expensive than wood Easy to mount to (drilling, nailing, gluing) Easy to mount to (drilling, nailing, gluing) Most significant stress from pedaling shear forces: Most significant stress from pedaling shear forces: σ TS = 31 MPa > σ pedal = 3.8 MPa

8. -3- Reach decision on vacuum component NO VACUUM IN PROTOTYPE NO VACUUM IN PROTOTYPE From McConnell trade study: From McConnell trade study: Would only save 4 minutes to evaporate 200 mL water Would only save 4 minutes to evaporate 200 mL water Cost: over $200 for motorized, over $50 hand pump Cost: over $200 for motorized, over $50 hand pump Would require pressure valves (~$30), another interface with potential for failure Would require pressure valves (~$30), another interface with potential for failure

9. Action Items for Week 9 (10/24)

10. -1- Sealant for heat source cover Sealant for heat source cover Ceramic material is semi-porous Ceramic material is semi-porous Sealant must withstand high temps Sealant must withstand high temps Non-porous, inexpensive Non-porous, inexpensive

11. -2- Decide on Heater-Condenser Interface Decide on Heater-Condenser Interface Heating element only holds 100 mL Heating element only holds 100 mL Competing concepts: Competing concepts: Permanently mount PVC pipe on top Permanently mount PVC pipe on top Place glass container inside heat source and surround with sand (high conductivity) Place glass container inside heat source and surround with sand (high conductivity)

13. -3- Have bike chain frame mounted to movable base Have bike chain frame mounted to movable base Approach: Approach: Weld base supports to bike frame Weld base supports to bike frame Screw base supports into movable MDF base Screw base supports into movable MDF base

14. Questions?