Human-Powered Potable Water Still A2 Nate Barbera Katie Kimar Ryan Reis Connie Slaboch

Status of Design

Design Requirements RequirementMinimumTarget Volume of H 2 0 Production in 60 minutes 200 mL *ASME requirement 500 mL Energy Output 58 kJ Max Number of uses 2035

Status of Design Design Requirements RequirementTargetMaximum Size L + G ≤ 2.1 m L + G ≤ 4.2 m *ASME requirement Weight 20 lbs 40 lbs Assembly Time 5 min 10 min Run Time 50 min 60 min *ASME requirement Water Quality (SG) *ASME requirement

Status of Design Design Requirements  Cost  Number of parts  Energy input  Lifetime

Last Week’s Items 1. Select heating source Friction selected as heat source Friction selected as heat source Friction test and electricity test run Friction test and electricity test run Fiberglass and brake pad reached 300 o F after 15 minutesFiberglass and brake pad reached 300 o F after 15 minutes Heating coil reached 143 o F in 15 minutes with 38 Watts of powerHeating coil reached 143 o F in 15 minutes with 38 Watts of power

Last Week’s Items (continued) 2. Find how long boiling water takes to evaporate Boiling experiments run Boiling experiments run Water boils at significantly lower temperatures with a vacuumWater boils at significantly lower temperatures with a vacuum Inconclusive results observedInconclusive results observed More tests are required More tests are required

Last Week’s Items (continued) 3. Assign Trade Studies Considered which elements of concept could benefit from in depth engineering analysis Considered which elements of concept could benefit from in depth engineering analysis 1.Heat transfer to water and Insulation 2.Vacuum 3.Spring design for applying normal load to friction elements 4.Material selection

Next Week’s Items 1. Develop concept memo Make final concept sketch Make final concept sketch Write concept memo Write concept memo 2. Write up Trade Study proposals Perform literature research on topics Perform literature research on topics 3. Continue testing Test more materials for heat generation Test more materials for heat generation Continue boiling water tests Continue boiling water tests

Show-stoppers  Water takes too long to evaporate  Load applied to friction surfaces makes pedaling more difficult

Schedule

Questions?