P14417: B9 Particle Filter Dan Anderson Thomas Heberle Perry Hosmer Karina Roundtree Kelly Stover

Agenda Design Overview Requirements Summary Competitive Advantage Process Improvements Next Iteration: Design Improvements Project Planning Lessons Learned

Design Overview

Requirements Summary RequirementMetricUnitsMarginalTargetActualResult Easy to clean / rechargeTime to cleanMinutes<10< O Has a minimal start-up period.Time elapseds (seconds)<30<10 1 O Usable by a family of 5, for 2-5 years w/out full replacement Mean Time To Failure Number of Uses >730>3650 Brush: 800 Bucket Assembly: Infinite Life Mesh: Infinite life O Removes Particles (turbidity/total suspended solids), assist UV TRANSMISSION TurbidityNTU O Does not negatively affect the taste of the water Percent of people with no negative affect %>50%>75% 63.50% O Overnight use scenarioFlowrate lpm (liters per min.) O Easy to clean / recharge # of Tools Req'd for (dis)assembly by end user -<2<1 1 O Lightweight for transportProduct Weight LBs (Pounds) <10< O Inexpensive ShippingRelative shipping volume- < volume of initial design 1/2 Initial (via nesting) O Operates using only energy available naturally (gravity, human power, etc.) Binary (Yes/No)--Yes O Filter is inexpensiveCost to produce$ (dollars)<25<20 $17.90 O Requires no consumables for operation, except for very cheap & locally available materials (salt, soap, sand, etc.) Operating Cost$ (dollars)<20 $- O No hazardous releasesBinary (Yes/No)--No O Legend X Doesn't meet specification Δ Undetermined O Meets specification

Competitive Advantage Simple design - minimal parts required Easy to use Durable Minimal Cleaning necessary - minimizes chances of getting contaminated Commonly found parts Reusable

Process Improvements Largest gap was in expectation for flow rate. May have been avoided through better communication with customer, specifically  More contact with customer  Making sure we obtained approval from the right people  Clearly stating what we are doing and ensuring the customer approves

Next Iteration: Possible Design Improvements Placing the mesh at an angle to increase flow rate (more surface area, less clogging) Induce pressure in the system to increase flow rate (e.g. plunger) Increase the diameter of the mesh openings. Add more holes on the underside of the lid. Implementing pre-filter with larger pore size. (Layered system) Increase hydrostatic pressure with higher volume of water. * Design considerations made with budget consideration.

Project Planning Flowrate testing was the largest source of error when planning. o It was difficult to estimate how long testing would take. o Even with 3 Prototypes, testing was often delayed. Water collection was the main factor in this delay o Water sources were frozen more than anticipated. o Collecting water before finalizing our design would have beneficial; regardless of the design we knew we’d eventually need it for testing. Action items weren’t always 100% correlated to the project plan. o The 2 nd semester of MSD was a big improvement in this respect.

Lessons Learned Communication: External (customer) and internal (project team) communication should be more frequent and consistent. Have written agreements for decisions and goals. Planning: Plans constantly change and evolve. Tasks like testing and exercising the system will often take longer than anticipated and may introduce issues that further extend timelines. Risks: Discover as many risks as you can. Make sure you account for a myriad of possibilities, from very likely situations to those you’d never expect to occur. Execution: Teamwork is essential. Share roles, don’t get locked down into one, as the project will benefit from different perspectives and input.

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