Particle Filter Design for Better Water Maker Improvement

P14417: B9 Plastics - Particle FilterDetailed Design Review Dan Anderson / Thomas Heberle / Perry Hosmer / Karina Roundtree / Kelly Stover December 10, 2013

Agenda • Problem Definition (time?) • Updated Design and Bill of Materials Justification (time?) • Test Plans (time?) • Assembly Procedure (time?) • Project Management (time?)

Problem Definition

Problem Statement Current State: • In order to use the Better Water Maker (BWM) users must first pour the water through a cloth before being treated. Desired State: • The device should clear particles from water to allow the BWM to operate more effectively. • The device should be simple to use and operable by both women and children. Project Goals: • Analyze the design selected by P13418 • Improve the effectiveness of the Better Water Maker Notable Constraints: • Must be usable by both women and children • Only locally available materials may be consumed • Must not negatively impact the smell and taste of water

Project Scope & Deliverables • Project Scope • Eliminate particles greater than 5 microns in size • Produce a design that is economically viable for use in developing countries • Design the device to be reusable, and use only consumable parts that are locally available • Deliverables to date • Functional prototype • Bill of Materials • Design Drawings • Assembly and manufacturing plan • Test plan and results

Customer Requirements

Engineering Requirements

Updated Design and Bill of Materials

Updated Drawing – CAD Drawing

Updated Drawing – Exploded BOM 1 3 2 4

Bottomless Bucket

Bottomless Bucket • Bucket in BOM chosen was inexpensive • Most buckets would work

Lid

Lid • Matches bucket bottom, reusable • Inexpensive

5 Micron Mesh

5 Micron Mesh • Stainless steel- limits corrosion • Material often used in filters

Bucket

Bucket • Inexpensive • 5 gallon deemed a good size • Same as bottomless bucket

Spacer

Rod

Spacer and Rods • Used to seal in mesh in assembly and to provide space between mesh and lid

Indented BOM

Assembly Procedure

Steps…

Time to Clean • Pilot study: select 30 participants, provide cleaning instructions, time the process • Hypothesis test (95% confidence) on the average time to clean product • H0: µ >= 5 minutes • HA: µ < 5 minutes • Adjustments in sample size (i.e. additional observations) may be necessary depending on the variance in the observed results • If the cleaning time is over the target value of 5 minutes, test for marginal success of 10 minutes

Number of Tools Required for Cleaning • Count of tools required • Nylon cloth is best material to clean this stainless steel mesh • Image of brush (KARINA WILL DECIDE THIS)

Weight

Start-up Time • Pilot study: collect 30 observations of start up time • Hypothesis test (95% confidence) on the average start up time • H0: µ >= 10 seconds • HA: µ < 10 seconds • Adjustments in sample size (i.e. additional observations) may be necessary depending on the variance in the observed results • If the cleaning time is over the target value of 10 seconds, test for marginal success of 30 seconds

No Power Source Needed • Show a picture of the design on this page • “Based on our design, there is no power source necessary”

Total Cost of Components

Labor Cost Estimations • Based on the assembly plans

Mean Time to Failure

Operating Costs • All components will last longer than the required 2 years. • Operating costs will be $0/year

Percentage Decrease in Turbidity • Pilot study: collect 30 observations of turbidity • Collect before/after, compute % difference • Hypothesis test (95% confidence) on the average % difference • H0: µ >= .75 • HA: µ > .75 • Adjustments in sample size (i.e. additional observations) may be necessary depending on the variance in the observed results • If turbidity does not meet target, test at 50% for marginal success

Percentage Decrease in Total Suspended Solids • Pilot study: collect 30 observations of TSS • Collect before/after, compute % difference • Hypothesis test (95% confidence) on the average % difference • H0: µ >= .75 • HA: µ > .75 • Adjustments in sample size (i.e. additional observations) may be necessary depending on the variance in the observed results • If turbidity does not meet target, test at 50% for marginal success

Taste of Water • Recruit at least 100 RIT students • Have each drink tap water that has not been treated with the filter and water that has been treated by the filter (blind) • Ask each student if the water tastes better, worse, or about the same • Target: 75% respond with better or about the same • Marginal: 50% respond with better or about the same

Hazardous Releases • Review of the design

Particle Filter Design for Better Water Maker Improvement

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