P14417: B9 Plastics - Particle Filter Detailed 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 o Eliminate particles greater than 5 microns in size o Produce a design that is economically viable for use in developing countries o Design the device to be reusable, and use only consumable parts that are locally available Deliverables to date o Functional prototype o Bill of Materials o Design Drawings o Assembly and manufacturing plan o Test plan and results

Customer Requirements Customer Requirement CategoryDescriptionImportance CR1Ease of UseEasy to prepare for use9 CR2Ease of UseLightweight for user transport / shipping3 CR3Ease of UseHas a minimal startup period3 CR4Ease of UseOperates using only naturally available energy9 CR5EconomicsInexpensive9 CR6EconomicsUsable by a family of 5, for 2-5 years without full replacement9 CR7Economics Requires no consumables for operation (other than cheap and locally available materials) 9 CR8FunctionalityImproves UV transmission9 CR9FunctionalityDecreases turbidity9 CR10FunctionalityDecreases total suspended solids9 CR11FunctionalityDoes not negatively affect taste3 CR12SafetyDoes not negatively affect safety of water9 CR13FunctionalityFilters enough water for a family of 5, daily3

Engineering Requirements CategoryScoreCustomer RequirementFunctionMetricUnitsMarginalTarget Ease of Use3Easy to clean / rechargeEasy to prepare for useTime to cleanminutes105 Ease of Use3Easy to clean / rechargeEasy to prepare for use Number of tools required for cleaning by the end user -21 Ease of Use3Lightweight for transportMinimize weight of filterWeight in lbslbs105 Ease of Use3Has a minimal start-up period.Minimize start-up Time elapsed between beginning of pour and first water that enters the bucket seconds3010 Ease of Use3 Operates using only energy available naturally (gravity, human power, etc.) Doesn't need power source Binary (Yes/No)--No Economics3Filter is inexpensiveMinimize cost of filterTotal cost to produceUS $2520 Economics3 Usable by a family of 5, for 2-5 years w/out full replacement Maximize durability of filter Mean Time To Failure# of uses Economics9 Requires no consumables for operation, except for very cheap & locally available materials (salt, soap, sand, etc.) Minimize cost to maintain Annual cost to operateUS $20 Functionality9Decreases turbidityTurbidity is decreasedPercentage Decrease%>50%>75% Functionality9Decreases total suspended solids Total suspended solids decreased Percentage Decrease%>50%>75% Functionality3 Does not negatively affect the taste of the water No negative taste of water Percent of people who say water tastes the same or better %>50%>75% Safety3No hazardous releases Doesn't produce hazardous release, no chemicals added Binary (Yes/No)--No Functionality3Use Scenarios Provides enough water for family of 5, dailyFlowratelpm

Updated Design and Bill of Materials

Updated Drawing – CAD Drawing

Updated Drawing – Exploded BOM

Bottomless Bucket

Bucket in BOM chosen was inexpensive Most buckets would work

Lid

Matches bucket bottom, reusable Inexpensive

5 Micron Mesh

Stainless steel- limits corrosion Material often used in filters

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…

Engineering Requirements

CategoryScoreCustomer RequirementFunctionMetricUnitsMarginalTarget Ease of Use3Easy to clean / rechargeEasy to prepare for useTime to cleanminutes105 Ease of Use3Easy to clean / rechargeEasy to prepare for use Number of tools required for cleaning by the end user -21 Ease of Use3Lightweight for transportMinimize weight of filterWeight in lbslbs105 Ease of Use3Has a minimal start-up period.Minimize start-up Time elapsed between beginning of pour and first water that enters the bucket seconds3010 Ease of Use3 Operates using only energy available naturally (gravity, human power, etc.) Doesn't need power source Binary (Yes/No)--No Economics3Filter is inexpensiveMinimize cost of filterTotal cost to produceUS $2520 Economics3 Usable by a family of 5, for 2-5 years w/out full replacement Maximize durability of filter Mean Time To Failure# of uses Economics9 Requires no consumables for operation, except for very cheap & locally available materials (salt, soap, sand, etc.) Minimize cost to maintain Annual cost to operateUS $20 Functionality9Decreases turbidityTurbidity is decreasedPercentage Decrease%>50%>75% Functionality9Decreases total suspended solids Total suspended solids decreased Percentage Decrease%>50%>75% Functionality3 Does not negatively affect the taste of the water No negative taste of water Percent of people who say water tastes the same or better %>50%>75% Safety3No hazardous releases Doesn't produce hazardous release, no chemicals added Binary (Yes/No)--No Functionality3Use Scenarios Provides enough water for family of 5, dailyFlowratelpm

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 o H 0 : µ >= 5 minutes o H A : 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

CategoryScoreCustomer RequirementFunctionMetricUnitsMarginalTarget Ease of Use3Easy to clean / rechargeEasy to prepare for useTime to cleanminutes105 Ease of Use3Easy to clean / rechargeEasy to prepare for use Number of tools required for cleaning by the end user -21 Ease of Use3Lightweight for transportMinimize weight of filterWeight in lbslbs105 Ease of Use3Has a minimal start-up period.Minimize start-up Time elapsed between beginning of pour and first water that enters the bucket seconds3010 Ease of Use3 Operates using only energy available naturally (gravity, human power, etc.) Doesn't need power source Binary (Yes/No)--No Economics3Filter is inexpensiveMinimize cost of filterTotal cost to produceUS $2520 Economics3 Usable by a family of 5, for 2-5 years w/out full replacement Maximize durability of filter Mean Time To Failure# of uses Economics9 Requires no consumables for operation, except for very cheap & locally available materials (salt, soap, sand, etc.) Minimize cost to maintain Annual cost to operateUS $20 Functionality9Decreases turbidityTurbidity is decreasedPercentage Decrease%>50%>75% Functionality9Decreases total suspended solids Total suspended solids decreased Percentage Decrease%>50%>75% Functionality3 Does not negatively affect the taste of the water No negative taste of water Percent of people who say water tastes the same or better %>50%>75% Safety3No hazardous releases Doesn't produce hazardous release, no chemicals added Binary (Yes/No)--No Functionality3Use Scenarios Provides enough water for family of 5, dailyFlowratelpm Engineering Requirements

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)

Engineering Requirements CategoryScoreCustomer RequirementFunctionMetricUnitsMarginalTarget Ease of Use3Easy to clean / rechargeEasy to prepare for useTime to cleanminutes105 Ease of Use3Easy to clean / rechargeEasy to prepare for use Number of tools required for cleaning by the end user -21 Ease of Use3Lightweight for transportMinimize weight of filterWeight in lbslbs105 Ease of Use3Has a minimal start-up period.Minimize start-up Time elapsed between beginning of pour and first water that enters the bucket seconds3010 Ease of Use3 Operates using only energy available naturally (gravity, human power, etc.) Doesn't need power source Binary (Yes/No)--No Economics3Filter is inexpensiveMinimize cost of filterTotal cost to produceUS $2520 Economics3 Usable by a family of 5, for 2-5 years w/out full replacement Maximize durability of filter Mean Time To Failure# of uses Economics9 Requires no consumables for operation, except for very cheap & locally available materials (salt, soap, sand, etc.) Minimize cost to maintain Annual cost to operateUS $20 Functionality9Decreases turbidityTurbidity is decreasedPercentage Decrease%>50%>75% Functionality9Decreases total suspended solids Total suspended solids decreased Percentage Decrease%>50%>75% Functionality3 Does not negatively affect the taste of the water No negative taste of water Percent of people who say water tastes the same or better %>50%>75% Safety3No hazardous releases Doesn't produce hazardous release, no chemicals added Binary (Yes/No)--No Functionality3Use Scenarios Provides enough water for family of 5, dailyFlowratelpm

Weight ComponentQuantityWeight/assembly (lbs) Bucket23.60 Lid micron mesh Total4.33

Engineering Requirements CategoryScoreCustomer RequirementFunctionMetricUnitsMarginalTarget Ease of Use3Easy to clean / rechargeEasy to prepare for useTime to cleanminutes105 Ease of Use3Easy to clean / rechargeEasy to prepare for use Number of tools required for cleaning by the end user -21 Ease of Use3Lightweight for transportMinimize weight of filterWeight in lbslbs105 Ease of Use3Has a minimal start-up period.Minimize start-up Time elapsed between beginning of pour and first water that enters the bucket seconds3010 Ease of Use3 Operates using only energy available naturally (gravity, human power, etc.) Doesn't need power source Binary (Yes/No)--No Economics3Filter is inexpensiveMinimize cost of filterTotal cost to produceUS $2520 Economics3 Usable by a family of 5, for 2-5 years w/out full replacement Maximize durability of filter Mean Time To Failure# of uses Economics9 Requires no consumables for operation, except for very cheap & locally available materials (salt, soap, sand, etc.) Minimize cost to maintain Annual cost to operateUS $20 Functionality9Decreases turbidityTurbidity is decreasedPercentage Decrease%>50%>75% Functionality9Decreases total suspended solids Total suspended solids decreased Percentage Decrease%>50%>75% Functionality3 Does not negatively affect the taste of the water No negative taste of water Percent of people who say water tastes the same or better %>50%>75% Safety3No hazardous releases Doesn't produce hazardous release, no chemicals added Binary (Yes/No)--No Functionality3Use Scenarios Provides enough water for family of 5, dailyFlowratelpm

Start-up Time Pilot study: collect 30 observations of start up time Hypothesis test (95% confidence) on the average start up time o H 0 : µ >= 10 seconds o H A : 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

Engineering Requirements CategoryScoreCustomer RequirementFunctionMetricUnitsMarginalTarget Ease of Use3Easy to clean / rechargeEasy to prepare for useTime to cleanminutes105 Ease of Use3Easy to clean / rechargeEasy to prepare for use Number of tools required for cleaning by the end user -21 Ease of Use3Lightweight for transportMinimize weight of filterWeight in lbslbs105 Ease of Use3Has a minimal start-up period.Minimize start-up Time elapsed between beginning of pour and first water that enters the bucket seconds3010 Ease of Use3 Operates using only energy available naturally (gravity, human power, etc.) Doesn't need power source Binary (Yes/No)--No Economics3Filter is inexpensiveMinimize cost of filterTotal cost to produceUS $2520 Economics3 Usable by a family of 5, for 2-5 years w/out full replacement Maximize durability of filter Mean Time To Failure# of uses Economics9 Requires no consumables for operation, except for very cheap & locally available materials (salt, soap, sand, etc.) Minimize cost to maintain Annual cost to operateUS $20 Functionality9Decreases turbidityTurbidity is decreasedPercentage Decrease%>50%>75% Functionality9Decreases total suspended solids Total suspended solids decreased Percentage Decrease%>50%>75% Functionality3 Does not negatively affect the taste of the water No negative taste of water Percent of people who say water tastes the same or better %>50%>75% Safety3No hazardous releases Doesn't produce hazardous release, no chemicals added Binary (Yes/No)--No Functionality3Use Scenarios Provides enough water for family of 5, dailyFlowratelpm

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

Engineering Requirements CategoryScoreCustomer RequirementFunctionMetricUnitsMarginalTarget Ease of Use3Easy to clean / rechargeEasy to prepare for useTime to cleanminutes105 Ease of Use3Easy to clean / rechargeEasy to prepare for use Number of tools required for cleaning by the end user -21 Ease of Use3Lightweight for transportMinimize weight of filterWeight in lbslbs105 Ease of Use3Has a minimal start-up period.Minimize start-up Time elapsed between beginning of pour and first water that enters the bucket seconds3010 Ease of Use3 Operates using only energy available naturally (gravity, human power, etc.) Doesn't need power source Binary (Yes/No)--No Economics3Filter is inexpensiveMinimize cost of filterTotal cost to produceUS $2520 Economics3 Usable by a family of 5, for 2-5 years w/out full replacement Maximize durability of filter Mean Time To Failure# of uses Economics9 Requires no consumables for operation, except for very cheap & locally available materials (salt, soap, sand, etc.) Minimize cost to maintain Annual cost to operateUS $20 Functionality9Decreases turbidityTurbidity is decreasedPercentage Decrease%>50%>75% Functionality9Decreases total suspended solids Total suspended solids decreased Percentage Decrease%>50%>75% Functionality3 Does not negatively affect the taste of the water No negative taste of water Percent of people who say water tastes the same or better %>50%>75% Safety3No hazardous releases Doesn't produce hazardous release, no chemicals added Binary (Yes/No)--No Functionality3Use Scenarios Provides enough water for family of 5, dailyFlowratelpm

Total Cost of Components ComponentQuantityCost/assembly Bucket2$5.94 Lid1$ micron mesh0.54$6.32 Brush Total

Labor Cost Estimations Based on the assembly plans

Engineering Requirements CategoryScoreCustomer RequirementFunctionMetricUnitsMarginalTarget Ease of Use3Easy to clean / rechargeEasy to prepare for useTime to cleanminutes105 Ease of Use3Easy to clean / rechargeEasy to prepare for use Number of tools required for cleaning by the end user -21 Ease of Use3Lightweight for transportMinimize weight of filterWeight in lbslbs105 Ease of Use3Has a minimal start-up period.Minimize start-up Time elapsed between beginning of pour and first water that enters the bucket seconds3010 Ease of Use3 Operates using only energy available naturally (gravity, human power, etc.) Doesn't need power source Binary (Yes/No)--No Economics3Filter is inexpensiveMinimize cost of filterTotal cost to produceUS $2520 Economics3 Usable by a family of 5, for 2-5 years w/out full replacement Maximize durability of filter Mean Time To Failure# of uses Economics9 Requires no consumables for operation, except for very cheap & locally available materials (salt, soap, sand, etc.) Minimize cost to maintain Annual cost to operateUS $20 Functionality9Decreases turbidityTurbidity is decreasedPercentage Decrease%>50%>75% Functionality9Decreases total suspended solids Total suspended solids decreased Percentage Decrease%>50%>75% Functionality3 Does not negatively affect the taste of the water No negative taste of water Percent of people who say water tastes the same or better %>50%>75% Safety3No hazardous releases Doesn't produce hazardous release, no chemicals added Binary (Yes/No)--No Functionality3Use Scenarios Provides enough water for family of 5, dailyFlowratelpm

Mean Time to Failure

Engineering Requirements CategoryScoreCustomer RequirementFunctionMetricUnitsMarginalTarget Ease of Use3Easy to clean / rechargeEasy to prepare for useTime to cleanminutes105 Ease of Use3Easy to clean / rechargeEasy to prepare for use Number of tools required for cleaning by the end user -21 Ease of Use3Lightweight for transportMinimize weight of filterWeight in lbslbs105 Ease of Use3Has a minimal start-up period.Minimize start-up Time elapsed between beginning of pour and first water that enters the bucket seconds3010 Ease of Use3 Operates using only energy available naturally (gravity, human power, etc.) Doesn't need power source Binary (Yes/No)--No Economics3Filter is inexpensiveMinimize cost of filterTotal cost to produceUS $2520 Economics3 Usable by a family of 5, for 2-5 years w/out full replacement Maximize durability of filter Mean Time To Failure# of uses Economics9 Requires no consumables for operation, except for very cheap & locally available materials (salt, soap, sand, etc.) Minimize cost to maintain Annual cost to operateUS $20 Functionality9Decreases turbidityTurbidity is decreasedPercentage Decrease%>50%>75% Functionality9Decreases total suspended solids Total suspended solids decreased Percentage Decrease%>50%>75% Functionality3 Does not negatively affect the taste of the water No negative taste of water Percent of people who say water tastes the same or better %>50%>75% Safety3No hazardous releases Doesn't produce hazardous release, no chemicals added Binary (Yes/No)--No Functionality3Use Scenarios Provides enough water for family of 5, dailyFlowratelpm

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

Engineering Requirements CategoryScoreCustomer RequirementFunctionMetricUnitsMarginalTarget Ease of Use3Easy to clean / rechargeEasy to prepare for useTime to cleanminutes105 Ease of Use3Easy to clean / rechargeEasy to prepare for use Number of tools required for cleaning by the end user -21 Ease of Use3Lightweight for transportMinimize weight of filterWeight in lbslbs105 Ease of Use3Has a minimal start-up period.Minimize start-up Time elapsed between beginning of pour and first water that enters the bucket seconds3010 Ease of Use3 Operates using only energy available naturally (gravity, human power, etc.) Doesn't need power source Binary (Yes/No)--No Economics3Filter is inexpensiveMinimize cost of filterTotal cost to produceUS $2520 Economics3 Usable by a family of 5, for 2-5 years w/out full replacement Maximize durability of filter Mean Time To Failure# of uses Economics9 Requires no consumables for operation, except for very cheap & locally available materials (salt, soap, sand, etc.) Minimize cost to maintain Annual cost to operateUS $20 Functionality9Decreases turbidityTurbidity is decreasedPercentage Decrease%>50%>75% Functionality9Decreases total suspended solids Total suspended solids decreased Percentage Decrease%>50%>75% Functionality3 Does not negatively affect the taste of the water No negative taste of water Percent of people who say water tastes the same or better %>50%>75% Safety3No hazardous releases Doesn't produce hazardous release, no chemicals added Binary (Yes/No)--No Functionality3Use Scenarios Provides enough water for family of 5, dailyFlowratelpm

Percentage Decrease in Turbidity Pilot study: collect 30 observations of turbidity o Collect before/after, compute % difference Hypothesis test (95% confidence) on the average % difference o H 0 : µ >=.75 o H A : 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

Engineering Requirements CategoryScoreCustomer RequirementFunctionMetricUnitsMarginalTarget Ease of Use3Easy to clean / rechargeEasy to prepare for useTime to cleanminutes105 Ease of Use3Easy to clean / rechargeEasy to prepare for use Number of tools required for cleaning by the end user -21 Ease of Use3Lightweight for transportMinimize weight of filterWeight in lbslbs105 Ease of Use3Has a minimal start-up period.Minimize start-up Time elapsed between beginning of pour and first water that enters the bucket seconds3010 Ease of Use3 Operates using only energy available naturally (gravity, human power, etc.) Doesn't need power source Binary (Yes/No)--No Economics3Filter is inexpensiveMinimize cost of filterTotal cost to produceUS $2520 Economics3 Usable by a family of 5, for 2-5 years w/out full replacement Maximize durability of filter Mean Time To Failure# of uses Economics9 Requires no consumables for operation, except for very cheap & locally available materials (salt, soap, sand, etc.) Minimize cost to maintain Annual cost to operateUS $20 Functionality9Decreases turbidityTurbidity is decreasedPercentage Decrease%>50%>75% Functionality9Decreases total suspended solids Total suspended solids decreased Percentage Decrease%>50%>75% Functionality3 Does not negatively affect the taste of the water No negative taste of water Percent of people who say water tastes the same or better %>50%>75% Safety3No hazardous releases Doesn't produce hazardous release, no chemicals added Binary (Yes/No)--No Functionality3Use Scenarios Provides enough water for family of 5, dailyFlowratelpm

Percentage Decrease in Total Suspended Solids Pilot study: collect 30 observations of TSS o Collect before/after, compute % difference Hypothesis test (95% confidence) on the average % difference o H 0 : µ >=.75 o H A : 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

Engineering Requirements CategoryScoreCustomer RequirementFunctionMetricUnitsMarginalTarget Ease of Use3Easy to clean / rechargeEasy to prepare for useTime to cleanminutes105 Ease of Use3Easy to clean / rechargeEasy to prepare for use Number of tools required for cleaning by the end user -21 Ease of Use3Lightweight for transportMinimize weight of filterWeight in lbslbs105 Ease of Use3Has a minimal start-up period.Minimize start-up Time elapsed between beginning of pour and first water that enters the bucket seconds3010 Ease of Use3 Operates using only energy available naturally (gravity, human power, etc.) Doesn't need power source Binary (Yes/No)--No Economics3Filter is inexpensiveMinimize cost of filterTotal cost to produceUS $2520 Economics3 Usable by a family of 5, for 2-5 years w/out full replacement Maximize durability of filter Mean Time To Failure# of uses Economics9 Requires no consumables for operation, except for very cheap & locally available materials (salt, soap, sand, etc.) Minimize cost to maintain Annual cost to operateUS $20 Functionality9Decreases turbidityTurbidity is decreasedPercentage Decrease%>50%>75% Functionality9Decreases total suspended solids Total suspended solids decreased Percentage Decrease%>50%>75% Functionality3 Does not negatively affect the taste of the water No negative taste of water Percent of people who say water tastes the same or better %>50%>75% Safety3No hazardous releases Doesn't produce hazardous release, no chemicals added Binary (Yes/No)--No Functionality3Use Scenarios Provides enough water for family of 5, dailyFlowratelpm

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

Engineering Requirements CategoryScoreCustomer RequirementFunctionMetricUnitsMarginalTarget Ease of Use3Easy to clean / rechargeEasy to prepare for useTime to cleanminutes105 Ease of Use3Easy to clean / rechargeEasy to prepare for use Number of tools required for cleaning by the end user -21 Ease of Use3Lightweight for transportMinimize weight of filterWeight in lbslbs105 Ease of Use3Has a minimal start-up period.Minimize start-up Time elapsed between beginning of pour and first water that enters the bucket seconds3010 Ease of Use3 Operates using only energy available naturally (gravity, human power, etc.) Doesn't need power source Binary (Yes/No)--No Economics3Filter is inexpensiveMinimize cost of filterTotal cost to produceUS $2520 Economics3 Usable by a family of 5, for 2-5 years w/out full replacement Maximize durability of filter Mean Time To Failure# of uses Economics9 Requires no consumables for operation, except for very cheap & locally available materials (salt, soap, sand, etc.) Minimize cost to maintain Annual cost to operateUS $20 Functionality9Decreases turbidityTurbidity is decreasedPercentage Decrease%>50%>75% Functionality9Decreases total suspended solids Total suspended solids decreased Percentage Decrease%>50%>75% Functionality3 Does not negatively affect the taste of the water No negative taste of water Percent of people who say water tastes the same or better %>50%>75% Safety3No hazardous releases Doesn't produce hazardous release, no chemicals added Binary (Yes/No)--No Functionality3Use Scenarios Provides enough water for family of 5, dailyFlowratelpm

Hazardous Releases Review of the design

Engineering Requirements CategoryScoreCustomer RequirementFunctionMetricUnitsMarginalTarget Ease of Use3Easy to clean / rechargeEasy to prepare for useTime to cleanminutes105 Ease of Use3Easy to clean / rechargeEasy to prepare for use Number of tools required for cleaning by the end user -21 Ease of Use3Lightweight for transportMinimize weight of filterWeight in lbslbs105 Ease of Use3Has a minimal start-up period.Minimize start-up Time elapsed between beginning of pour and first water that enters the bucket seconds3010 Ease of Use3 Operates using only energy available naturally (gravity, human power, etc.) Doesn't need power source Binary (Yes/No)--No Economics3Filter is inexpensiveMinimize cost of filterTotal cost to produceUS $2520 Economics3 Usable by a family of 5, for 2-5 years w/out full replacement Maximize durability of filter Mean Time To Failure# of uses Economics9 Requires no consumables for operation, except for very cheap & locally available materials (salt, soap, sand, etc.) Minimize cost to maintain Annual cost to operateUS $20 Functionality9Decreases turbidityTurbidity is decreasedPercentage Decrease%>50%>75% Functionality9Decreases total suspended solids Total suspended solids decreased Percentage Decrease%>50%>75% Functionality3 Does not negatively affect the taste of the water No negative taste of water Percent of people who say water tastes the same or better %>50%>75% Safety3No hazardous releases Doesn't produce hazardous release, no chemicals added Binary (Yes/No)--No Functionality3Use Scenarios Provides enough water for family of 5, dailyFlowratelpm

Flowrate Pilot study: collect 30 observations of the flow of 5 gallons of water through the filter o Collect time elapsed to filter all 5 gallons, compute flow rate in lpm Hypothesis test (95% confidence) on the flow rate o H 0 : µ >=.0394 lpm o H A : µ >.0394 lpm 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.6309 lpm for marginal success

Project Management

Risk Assessment

Risk Curve

Plan for MSD II

Lessons Learned

The Senior Design Process

Action Items ItemsOwnerDue Date

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